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\n  \n 2021\n \n \n (10)\n \n \n
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\n \n\n \n \n Tosun, N.; Ceylan, D.; Polat, H.; and Keysan, O.\n\n\n \n \n \n \n \n A Comparison of Velocity Skin Effect Modeling With 2-D Transient and 3-D Quasi-Transient Finite Element Methods.\n \n \n \n \n\n\n \n\n\n\n IEEE Transactions on Plasma Science, 49(4): 1500–1507. apr 2021.\n \n\n\n\n
\n\n\n\n \n \n \"APaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 10 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{Tosun2021,\nauthor = {Tosun, Nail and Ceylan, Doga and Polat, Hakan and Keysan, Ozan},\ndoi = {10.1109/TPS.2021.3067105},\nfile = {:home/ozi/Downloads/A_Comparison_of_Velocity_Skin_Effect_Modeling_With_2-D_Transient_and_3-D_Quasi-Transient_Finite_Element_Methods.pdf:pdf},\nissn = {0093-3813},\njournal = {IEEE Transactions on Plasma Science},\nmonth = {apr},\nnumber = {4},\npages = {1500--1507},\ntitle = {{A Comparison of Velocity Skin Effect Modeling With 2-D Transient and 3-D Quasi-Transient Finite Element Methods}},\nurl = {https://ieeexplore.ieee.org/document/9387772/},\nvolume = {49},\nyear = {2021}\n}\n
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\n \n\n \n \n Cakal, G.; and Keysan, O.\n\n\n \n \n \n \n \n Axial flux generator with novel flat wire for direct‐drive wind turbines.\n \n \n \n \n\n\n \n\n\n\n IET Renewable Power Generation, 15(1): 139–152. jan 2021.\n \n\n\n\n
\n\n\n\n \n \n \"AxialPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 3 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{Cakal2021,\nabstract = {With the increased demand for renewable energy resources, the direct-drive wind turbine generators have been studied intensely in the last few decades. One megawatt direct-drive axial flux permanent magnet generator is presented. The novelty in this design is that instead of conventional stranded wires, the windings of the generator are manufactured from a conductor sheet by cutting and bending processes. This creates critical advantages of superior current ratings, ease of manufacturing, and reduced structural mass. An optimization study is conducted with the presented fully analytical model, and the optimum design is compared with the other wind power generators presented in the literature. At the end, a 1 MW, 480 kNm, and 16 tons direct-driven generator is achieved.},\nauthor = {Cakal, Gokhan and Keysan, Ozan},\ndoi = {10.1049/rpg2.12011},\nfile = {:home/ozi/Downloads/rpg2.12011.pdf:pdf},\nissn = {1752-1416},\njournal = {IET Renewable Power Generation},\nmonth = {jan},\nnumber = {1},\npages = {139--152},\ntitle = {{Axial flux generator with novel flat wire for direct‐drive wind turbines}},\nurl = {https://onlinelibrary.wiley.com/doi/10.1049/rpg2.12011},\nvolume = {15},\nyear = {2021}\n}\n
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\n With the increased demand for renewable energy resources, the direct-drive wind turbine generators have been studied intensely in the last few decades. One megawatt direct-drive axial flux permanent magnet generator is presented. The novelty in this design is that instead of conventional stranded wires, the windings of the generator are manufactured from a conductor sheet by cutting and bending processes. This creates critical advantages of superior current ratings, ease of manufacturing, and reduced structural mass. An optimization study is conducted with the presented fully analytical model, and the optimum design is compared with the other wind power generators presented in the literature. At the end, a 1 MW, 480 kNm, and 16 tons direct-driven generator is achieved.\n
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\n \n\n \n \n Polat, H.; Ayaz, E.; Altun, O.; and Keysan, O.\n\n\n \n \n \n \n \n Balancing of Common DC-Bus Parallel Connected Modular Inductive Power Transfer Systems.\n \n \n \n \n\n\n \n\n\n\n IEEE Journal of Emerging and Selected Topics in Power Electronics, 6777(c): 1–1. 2021.\n \n\n\n\n
\n\n\n\n \n \n \"BalancingPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Polat2021,\nabstract = {The aim of this paper is to design a modular, fault tolerant multi-transmitter(Tx)/multi-receiver(Rx) parallel connected common DC bus inductive power transfer(IPT) system to replace slip rings in wind turbines or brushless exciters. In parallel connected common DC bus systems, current unbalance is a major issue that results in thermal stresses and over current or voltages. In this paper, two different new current balancing methods are proposed: Cross-coupled Rx modules and intentional de-tuning of Rx side resonant frequency. These methods are investigated both analytically and experimentally for a single Tx and two Rx system for a 500 W prototype. The proposed methods are tested independently, and then the combined current balancing method is also investigated. For the same misalignment case, cross-coupled/de-tuned has a 55.8% current balancing improvement compared to de-coupled/fully-tuned topology.},\nauthor = {Polat, Hakan and Ayaz, Enes and Altun, Ogun and Keysan, Ozan},\ndoi = {10.1109/JESTPE.2021.3074888},\nfile = {:home/ozi/Downloads/Balancing_of_Common_DC-Bus_Parallel_Connected_Modular_Inductive_Power_Transfer_Systems.pdf:pdf},\nissn = {2168-6777},\njournal = {IEEE Journal of Emerging and Selected Topics in Power Electronics},\nkeywords = {Couplings,Inductance,Magnetic resonance,Magnetomechanical effects,Power electronics,Receivers,Resistance,Wireless power transfer,common DC bus,current balancing,inductive power transfer,modular design},\nnumber = {c},\npages = {1--1},\ntitle = {{Balancing of Common DC-Bus Parallel Connected Modular Inductive Power Transfer Systems}},\nurl = {https://ieeexplore.ieee.org/document/9410607/},\nvolume = {6777},\nyear = {2021}\n}\n
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\n The aim of this paper is to design a modular, fault tolerant multi-transmitter(Tx)/multi-receiver(Rx) parallel connected common DC bus inductive power transfer(IPT) system to replace slip rings in wind turbines or brushless exciters. In parallel connected common DC bus systems, current unbalance is a major issue that results in thermal stresses and over current or voltages. In this paper, two different new current balancing methods are proposed: Cross-coupled Rx modules and intentional de-tuning of Rx side resonant frequency. These methods are investigated both analytically and experimentally for a single Tx and two Rx system for a 500 W prototype. The proposed methods are tested independently, and then the combined current balancing method is also investigated. For the same misalignment case, cross-coupled/de-tuned has a 55.8% current balancing improvement compared to de-coupled/fully-tuned topology.\n
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\n \n\n \n \n Cakal, G.; and Keysan, O.\n\n\n \n \n \n \n \n Flat winding made of aluminum or copper sheet for axial flux machines.\n \n \n \n \n\n\n \n\n\n\n IET Electric Power Applications, 15(4): 429–440. apr 2021.\n \n\n\n\n
\n\n\n\n \n \n \"FlatPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{Cakal2021a,\nauthor = {Cakal, Gokhan and Keysan, Ozan},\ndoi = {10.1049/elp2.12034},\nfile = {:home/ozi/Downloads/elp2.12034.pdf:pdf},\nissn = {1751-8660},\njournal = {IET Electric Power Applications},\nmonth = {apr},\nnumber = {4},\npages = {429--440},\ntitle = {{Flat winding made of aluminum or copper sheet for axial flux machines}},\nurl = {https://onlinelibrary.wiley.com/doi/10.1049/elp2.12034},\nvolume = {15},\nyear = {2021}\n}\n
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\n \n\n \n \n Yuruk, H.; Keysan, O.; and Ulutas, B.\n\n\n \n \n \n \n \n Comparison of the Effects of Nonlinearities for Si MOSFET and GaN E-HEMT Based VSIs.\n \n \n \n \n\n\n \n\n\n\n IEEE Transactions on Industrial Electronics, 68(7): 5606–5615. jul 2021.\n \n\n\n\n
\n\n\n\n \n \n \"ComparisonPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 5 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Yuruk2021,\nabstract = {Nonlinearities in voltage source inverters (VSIs) such as; dead time, switching time, delay time, voltage drops on the power switches, parasitic capacitance, etc., are considered to be the main sources of the output voltage distortions. These distortions result in low-order harmonics in the output current, which in turn increase core losses and create torque ripples. In particular, for low-speed applications with low-inductance motors, the control performance and the stability of the system degrades substantially, especially when the system operates in the low-torque region. In this work, the effects of these nonlinearities on the phase current and on the current control of the silicon (Si) metal oxide semiconductor field effect transistor (MOSFET) based VSI are investigated with an air cored low inductance permanent magnet synchronous motor. Furthermore, Gallium nitride (GaN) enhancement mode high electron mobility transistor (E-HEMT) based VSI is proposed to overcome this problem. Next, improvements in the current control process are demonstrated by comparing the experimental results obtained by using GaN E-HEMT and Si MOSFET based VSIs. Results show that GaN E-HEMT based VSI is a better choice for applications, which require a high bandwidth control.},\nauthor = {Yuruk, Huseyin and Keysan, Ozan and Ulutas, Baris},\ndoi = {10.1109/TIE.2020.2996132},\nfile = {:home/ozi/Downloads/Comparison_of_the_Effects_of_Nonlinearities_for_Si_MOSFET_and_GaN_E-HEMT_Based_VSIs.pdf:pdf},\nissn = {0278-0046},\njournal = {IEEE Transactions on Industrial Electronics},\nkeywords = {Current control,Gallium nitride (GaN) enhancement mode high electr,Si metal oxide semiconductor field effect transist,dead time,nonlinearity},\nmonth = {jul},\nnumber = {7},\npages = {5606--5615},\ntitle = {{Comparison of the Effects of Nonlinearities for Si MOSFET and GaN E-HEMT Based VSIs}},\nurl = {https://ieeexplore.ieee.org/document/9102428/},\nvolume = {68},\nyear = {2021}\n}\n
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\n Nonlinearities in voltage source inverters (VSIs) such as; dead time, switching time, delay time, voltage drops on the power switches, parasitic capacitance, etc., are considered to be the main sources of the output voltage distortions. These distortions result in low-order harmonics in the output current, which in turn increase core losses and create torque ripples. In particular, for low-speed applications with low-inductance motors, the control performance and the stability of the system degrades substantially, especially when the system operates in the low-torque region. In this work, the effects of these nonlinearities on the phase current and on the current control of the silicon (Si) metal oxide semiconductor field effect transistor (MOSFET) based VSI are investigated with an air cored low inductance permanent magnet synchronous motor. Furthermore, Gallium nitride (GaN) enhancement mode high electron mobility transistor (E-HEMT) based VSI is proposed to overcome this problem. Next, improvements in the current control process are demonstrated by comparing the experimental results obtained by using GaN E-HEMT and Si MOSFET based VSIs. Results show that GaN E-HEMT based VSI is a better choice for applications, which require a high bandwidth control.\n
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\n \n\n \n \n Yuruk, H.; and Keysan, O.\n\n\n \n \n \n \n \n Parallel connected GaN E‐HEMT VSI‐based servo drives for PMSMs.\n \n \n \n \n\n\n \n\n\n\n IET Electric Power Applications. sep 2021.\n \n\n\n\n
\n\n\n\n \n \n \"ParallelPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Yuruk2021a,\nauthor = {Yuruk, Huseyin and Keysan, Ozan},\ndoi = {10.1049/elp2.12136},\nfile = {:home/ozi/Downloads/elp2.12136.pdf:pdf},\nissn = {1751-8660},\njournal = {IET Electric Power Applications},\nkeywords = {ac motor drives,ankara,aselsan inc,connected inverters,department of electrical and,electronics,parallel,power electronics,pwm inverters,turkey},\nmonth = {sep},\ntitle = {{Parallel connected GaN E‐HEMT VSI‐based servo drives for PMSMs}},\nurl = {https://onlinelibrary.wiley.com/doi/10.1049/elp2.12136},\nyear = {2021}\n}\n
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\n \n\n \n \n Özcan, M.; Keysan, O.; and Satır, B.\n\n\n \n \n \n \n \n Optimum bidding strategy for wind and solar power plants in day-ahead electricity market.\n \n \n \n \n\n\n \n\n\n\n Energy Systems, (0123456789). jun 2021.\n \n\n\n\n
\n\n\n\n \n \n \"OptimumPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Ozcan2021,\nabstract = {There are two possible strategies for wind power plants (WPPs) and solar power plants (SPPs) to maximize their income in day ahead markets (DAM) in the presence of imbalance cost: joint bidding (JB) via collaboration by participating to balancing groups and deployment of storage technologies. There are limited studies in the literature covering the comparative analysis of “JB strategy” with “battery deployment (BD) strategy”. In the existence of balancing responsibility, the comparative analysis of these strategies is the main contribution of this study to the literature. Our Second contribution is the analysis of the impact of different regulatory regimes, which are set by the regulatory authority, on total income. JBM (joint bidding model), which is the model for joint bidding via different collaboration groups, is developed for the analysis of JB strategy, BDM (battery deployment model), which is the model covering the deployment of storage technology, is developed for the analysis of BD strategy. The impact of each strategy on total income is analyzed. According to the analysis of the results of the models, while JB strategy, which is sensitive to the regulatory regime, increases the total annual income of the collaboration groups up to 0.65%, BD strategy seems not feasible and financially viable. On the other hand, extra income values per MW of battery for SPP is between $218 and $400 /MW-year, while these values are between $2460 and $6795/MW-year for the group of 15 WPPs. Therefore, deployment of battery for WPPs creates extra income more than tenfold of that of SPP. BD strategy can be viable provided that the levelized cost of deployment of battery drops below the extra income values achieved per MW of battery.},\nauthor = {{\\"{O}}zcan, Mehmet and Keysan, Ozan and Satır, Benh{\\"{u}}r},\ndoi = {10.1007/s12667-021-00441-z},\nfile = {:home/ozi/Downloads/{\\"{O}}zcan2021_Article_OptimumBiddingStrategyForWindA.pdf:pdf},\nisbn = {1266702100441},\nissn = {1868-3967},\njournal = {Energy Systems},\nkeywords = {Day-ahead electricity market,Optimization,Optimum bidding,Trade of renewable energy},\nmonth = {jun},\nnumber = {0123456789},\npublisher = {Springer Berlin Heidelberg},\ntitle = {{Optimum bidding strategy for wind and solar power plants in day-ahead electricity market}},\nurl = {https://doi.org/10.1007/s12667-021-00441-z https://link.springer.com/10.1007/s12667-021-00441-z},\nyear = {2021}\n}\n
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\n There are two possible strategies for wind power plants (WPPs) and solar power plants (SPPs) to maximize their income in day ahead markets (DAM) in the presence of imbalance cost: joint bidding (JB) via collaboration by participating to balancing groups and deployment of storage technologies. There are limited studies in the literature covering the comparative analysis of “JB strategy” with “battery deployment (BD) strategy”. In the existence of balancing responsibility, the comparative analysis of these strategies is the main contribution of this study to the literature. Our Second contribution is the analysis of the impact of different regulatory regimes, which are set by the regulatory authority, on total income. JBM (joint bidding model), which is the model for joint bidding via different collaboration groups, is developed for the analysis of JB strategy, BDM (battery deployment model), which is the model covering the deployment of storage technology, is developed for the analysis of BD strategy. The impact of each strategy on total income is analyzed. According to the analysis of the results of the models, while JB strategy, which is sensitive to the regulatory regime, increases the total annual income of the collaboration groups up to 0.65%, BD strategy seems not feasible and financially viable. On the other hand, extra income values per MW of battery for SPP is between $218 and $400 /MW-year, while these values are between $2460 and $6795/MW-year for the group of 15 WPPs. Therefore, deployment of battery for WPPs creates extra income more than tenfold of that of SPP. BD strategy can be viable provided that the levelized cost of deployment of battery drops below the extra income values achieved per MW of battery.\n
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\n \n\n \n \n Karakaya, F.; Gülsuna, Ö.; and Keysan, O.\n\n\n \n \n \n \n \n Feasibility of Quasi-Square-Wave Zero-Voltage-Switching Bi-Directional DC/DC Converters with GaN HEMTs.\n \n \n \n \n\n\n \n\n\n\n Energies, 14(10): 2867. may 2021.\n \n\n\n\n
\n\n\n\n \n \n \"FeasibilityPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Karakaya2021,\nabstract = {There are trade-offs for each power converter design which are mainly dictated by the switching component and passive component ratings. Recent power electronic devices such as Gallium Nitride (GaN) transistors can improve the application range of power converter topologies with lower conduction and switching losses. These new capabilities brought by the GaN High Electron Mobility Transistors (HEMTs) inevitably changes the feasible operation ranges of power converters. This paper investigates the feasibility of Buck and Boost based bi-directional DC/DC converter which utilizes Quasi-Square-Wave (QSW) Zero Voltage Switching (ZVS) on GaN HEMTs. The proposed converter applies a high-switching frequency at high output power to maximize the power density at the cost of high current ripple with high frequency of operation which requires a design strategy for the passive components. An inductor design methodology is performed to operate at 28 APP with a switching frequency of 450 kHz. In order to minimize the high ripple current stress on the output capacitors an interleaving is performed. Finally, the proposed bi-directional converter is operated at 5.4 kW with 5.24 kW/L or 85.9 W/in3 volumetric power density with air-forced cooling. The converter performance is verified for buck and boost modes and full load efficiencies are recorded as 97.7% and 98.7%, respectively.},\nauthor = {Karakaya, Furkan and G{\\"{u}}lsuna, {\\"{O}}zg{\\"{u}}r and Keysan, Ozan},\ndoi = {10.3390/en14102867},\nfile = {:home/ozi/Downloads/energies-14-02867-v2.pdf:pdf},\nissn = {1996-1073},\njournal = {Energies},\nkeywords = {bi-directional dc,dc converter,gallium nitride,gan hemt,high-frequency operation,ing,interleav-,power density,reliability},\nmonth = {may},\nnumber = {10},\npages = {2867},\ntitle = {{Feasibility of Quasi-Square-Wave Zero-Voltage-Switching Bi-Directional DC/DC Converters with GaN HEMTs}},\nurl = {https://www.mdpi.com/1996-1073/14/10/2867},\nvolume = {14},\nyear = {2021}\n}\n
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\n There are trade-offs for each power converter design which are mainly dictated by the switching component and passive component ratings. Recent power electronic devices such as Gallium Nitride (GaN) transistors can improve the application range of power converter topologies with lower conduction and switching losses. These new capabilities brought by the GaN High Electron Mobility Transistors (HEMTs) inevitably changes the feasible operation ranges of power converters. This paper investigates the feasibility of Buck and Boost based bi-directional DC/DC converter which utilizes Quasi-Square-Wave (QSW) Zero Voltage Switching (ZVS) on GaN HEMTs. The proposed converter applies a high-switching frequency at high output power to maximize the power density at the cost of high current ripple with high frequency of operation which requires a design strategy for the passive components. An inductor design methodology is performed to operate at 28 APP with a switching frequency of 450 kHz. In order to minimize the high ripple current stress on the output capacitors an interleaving is performed. Finally, the proposed bi-directional converter is operated at 5.4 kW with 5.24 kW/L or 85.9 W/in3 volumetric power density with air-forced cooling. The converter performance is verified for buck and boost modes and full load efficiencies are recorded as 97.7% and 98.7%, respectively.\n
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\n \n\n \n \n Karakaya, F.; Alemdar, O. S.; and Keysan, O.\n\n\n \n \n \n \n \n Layout-Based Ultrafast Short-Circuit Protection Technique for Parallel-Connected GaN HEMTs.\n \n \n \n \n\n\n \n\n\n\n IEEE Journal of Emerging and Selected Topics in Power Electronics, 9(5): 6385–6395. oct 2021.\n \n\n\n\n
\n\n\n\n \n \n \"Layout-BasedPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{Karakaya2021a,\nauthor = {Karakaya, Furkan and Alemdar, Ozturk Sahin and Keysan, Ozan},\ndoi = {10.1109/JESTPE.2021.3052611},\nfile = {:home/ozi/Downloads/Layout-Based_Ultrafast_Short-Circuit_Protection_Technique_for_Parallel-Connected_GaN_HEMTs.pdf:pdf},\nissn = {2168-6777},\njournal = {IEEE Journal of Emerging and Selected Topics in Power Electronics},\nmonth = {oct},\nnumber = {5},\npages = {6385--6395},\npublisher = {IEEE},\ntitle = {{Layout-Based Ultrafast Short-Circuit Protection Technique for Parallel-Connected GaN HEMTs}},\nurl = {https://ieeexplore.ieee.org/document/9328269/},\nvolume = {9},\nyear = {2021}\n}\n
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\n \n\n \n \n Sahin, I.; and Keysan, O.\n\n\n \n \n \n \n \n Model Predictive Controller Utilized as an Observer for Inter-Turn Short Circuit Detection in Induction Motors.\n \n \n \n \n\n\n \n\n\n\n IEEE Transactions on Energy Conversion, 36(2): 1449–1458. jun 2021.\n \n\n\n\n
\n\n\n\n \n \n \"ModelPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Sahin2021,\nabstract = {In this paper, a novel and non-invasive stator inter-turn short circuit (ITSC) online detection method is presented for an induction machine (IM), driven by a two-level voltage source inverter (2L-VSI) via finite control set model predictive control (FCS-MPC). The main idea of the proposed method is to utilize the controller itself as an observer: under the presence of a fault, the distribution of inverter switching states significantly deviates from the original balanced case. Therefore, by inspecting the inverter switching vectors, which are the outcomes of the FCS-MPC routine's online optimization procedure, a stator fault can be detected efficiently. It is observed that both the zero-vector allocation over the complex plane and the allocation among the active vectors are influenced by the presence of a stator short-circuit fault. The proposed fault detection strategy introduces little to no extra burden for processor and memory. Experimental results verify the proposed method, and inter-turn short circuits of two and three turns are confidently detected and located for a 500 W, two-pole IM.},\nauthor = {Sahin, Ilker and Keysan, Ozan},\ndoi = {10.1109/TEC.2020.3048071},\nfile = {:home/ozi/Downloads/Model_Predictive_Controller_Utilized_as_an_Observer_for_Inter-Turn_Short_Circuit_Detection_in_Induction_Motors.pdf:pdf},\nissn = {0885-8969},\njournal = {IEEE Transactions on Energy Conversion},\nkeywords = {Fault diagnosis,condition monitoring,finite control set model predictive control (FCS-M,inter-turn short circuit (ITSC),inverter statistics},\nmonth = {jun},\nnumber = {2},\npages = {1449--1458},\ntitle = {{Model Predictive Controller Utilized as an Observer for Inter-Turn Short Circuit Detection in Induction Motors}},\nurl = {https://ieeexplore.ieee.org/document/9310277/},\nvolume = {36},\nyear = {2021}\n}\n
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\n In this paper, a novel and non-invasive stator inter-turn short circuit (ITSC) online detection method is presented for an induction machine (IM), driven by a two-level voltage source inverter (2L-VSI) via finite control set model predictive control (FCS-MPC). The main idea of the proposed method is to utilize the controller itself as an observer: under the presence of a fault, the distribution of inverter switching states significantly deviates from the original balanced case. Therefore, by inspecting the inverter switching vectors, which are the outcomes of the FCS-MPC routine's online optimization procedure, a stator fault can be detected efficiently. It is observed that both the zero-vector allocation over the complex plane and the allocation among the active vectors are influenced by the presence of a stator short-circuit fault. The proposed fault detection strategy introduces little to no extra burden for processor and memory. Experimental results verify the proposed method, and inter-turn short circuits of two and three turns are confidently detected and located for a 500 W, two-pole IM.\n
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\n  \n 2020\n \n \n (8)\n \n \n
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\n \n\n \n \n Tosun, N.; Polat, H.; Ceylan, D.; Karagoz, M.; Yildirim, B.; Gungen, I.; and Keysan, O.\n\n\n \n \n \n \n \n A Hybrid Simulation Model for Electromagnetic Launchers Including the Transient Inductance and Electromotive Force.\n \n \n \n \n\n\n \n\n\n\n IEEE Transactions on Plasma Science, 48(9): 3220–3228. sep 2020.\n \n\n\n\n
\n\n\n\n \n \n \"APaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 3 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Tosun2020,\nabstract = {Although electromagnetic launchers (EMLs) are superior to classical gun-powder-based launchers, they have to withstand extreme electrical and mechanical conditions. Therefore, the optimal design and precise simulations of these devices are crucial. In this article, a new simulation strategy for EMLs is proposed in order to achieve high accuracy and reduced complexity. The inductance and electromotive force (EMF) variations in the transient, which have a considerable influence on the launch process, are modeled using the finite element method (FEM) coupled with electrical circuit simulation. The proposed method has a good agreement with the experimental results of two EMLs (EMFY-1 and EMFY-2), which have 25- and 50-mm square bores and 3-m-length launchers. The study showed that the hybrid model with transient inductance and EMF calculations showed a good agreement with experiments that have 625 kJ-3.241-MJ input energies.},\nauthor = {Tosun, Nail and Polat, Hakan and Ceylan, Doga and Karagoz, Mustafa and Yildirim, Baran and Gungen, Ibrahim and Keysan, Ozan},\ndoi = {10.1109/TPS.2020.3016930},\nfile = {:home/ozi/Downloads/A_Hybrid_Simulation_Model_for_Electromagnetic_Launchers_Including_the_Transient_Inductance_and_Electromotive_Force.pdf:pdf},\nissn = {0093-3813},\njournal = {IEEE Transactions on Plasma Science},\nkeywords = {Electromagnetic launchers (EMLs),electromotive force (EMF),finite element method (FEM),pulse power supplies,transient inductance,velocity skin effect (VSE)},\nmonth = {sep},\nnumber = {9},\npages = {3220--3228},\ntitle = {{A Hybrid Simulation Model for Electromagnetic Launchers Including the Transient Inductance and Electromotive Force}},\nurl = {https://ieeexplore.ieee.org/document/9179020/},\nvolume = {48},\nyear = {2020}\n}\n
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\n Although electromagnetic launchers (EMLs) are superior to classical gun-powder-based launchers, they have to withstand extreme electrical and mechanical conditions. Therefore, the optimal design and precise simulations of these devices are crucial. In this article, a new simulation strategy for EMLs is proposed in order to achieve high accuracy and reduced complexity. The inductance and electromotive force (EMF) variations in the transient, which have a considerable influence on the launch process, are modeled using the finite element method (FEM) coupled with electrical circuit simulation. The proposed method has a good agreement with the experimental results of two EMLs (EMFY-1 and EMFY-2), which have 25- and 50-mm square bores and 3-m-length launchers. The study showed that the hybrid model with transient inductance and EMF calculations showed a good agreement with experiments that have 625 kJ-3.241-MJ input energies.\n
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\n \n\n \n \n Tokgöz, F.; Çakal, G.; and Keysan, O.\n\n\n \n \n \n \n \n Comparison of PCB winding topologies for axial‐flux permanent magnet synchronous machines.\n \n \n \n \n\n\n \n\n\n\n IET Electric Power Applications, 14(13): 2577–2586. dec 2020.\n \n\n\n\n
\n\n\n\n \n \n \"ComparisonPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{Tokgoz2020,\nabstract = {Although axial-flux permanent magnet machines have high torque densities, challenges regarding mass production of stators make them a less appealing choice. Printed circuit board (PCB) axial-flux machine is a type of machine with a stator that is made of layers of PCB. Given the precise, fast, and cheap mass production capabilities of PCB manufacturers, PCB axial-flux machines stand as a viable alternative for conventional round-wire winding machines. In this study, five different winding topologies are compared. Their induced phase voltages and torque are calculated using the developed magnetic scalar potential method and finite element analysis (FEA). Proposed windings are tested on a 16-pole, 2000-RPM, double rotor-single stator axial-flux permanent magnet synchronous machine. Results showed that the parallel winding had the smallest resistance and loss. Moreover, radial and concentric winding had the highest induced voltage and torque while the radial winding had 20% less phase resistance than concentric. Also, the induced voltage of radial winding had the smallest total harmonic distortion in comparison with other winding types. A novel unequal width parallel winding is proposed and it is compared with parallel winding separately. It is found that by simply increasing the cross-section area of wave windings, it is possible to decrease copper loss by 17%.},\nauthor = {Tokg{\\"{o}}z, Furkan and {\\c{C}}akal, G{\\"{o}}khan and Keysan, Ozan},\ndoi = {10.1049/iet-epa.2020.0622},\nfile = {:home/ozi/Downloads/iet-epa.2020.0622.pdf:pdf},\nissn = {1751-8660},\njournal = {IET Electric Power Applications},\nmonth = {dec},\nnumber = {13},\npages = {2577--2586},\ntitle = {{Comparison of PCB winding topologies for axial‐flux permanent magnet synchronous machines}},\nurl = {https://onlinelibrary.wiley.com/doi/10.1049/iet-epa.2020.0622},\nvolume = {14},\nyear = {2020}\n}\n
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\n Although axial-flux permanent magnet machines have high torque densities, challenges regarding mass production of stators make them a less appealing choice. Printed circuit board (PCB) axial-flux machine is a type of machine with a stator that is made of layers of PCB. Given the precise, fast, and cheap mass production capabilities of PCB manufacturers, PCB axial-flux machines stand as a viable alternative for conventional round-wire winding machines. In this study, five different winding topologies are compared. Their induced phase voltages and torque are calculated using the developed magnetic scalar potential method and finite element analysis (FEA). Proposed windings are tested on a 16-pole, 2000-RPM, double rotor-single stator axial-flux permanent magnet synchronous machine. Results showed that the parallel winding had the smallest resistance and loss. Moreover, radial and concentric winding had the highest induced voltage and torque while the radial winding had 20% less phase resistance than concentric. Also, the induced voltage of radial winding had the smallest total harmonic distortion in comparison with other winding types. A novel unequal width parallel winding is proposed and it is compared with parallel winding separately. It is found that by simply increasing the cross-section area of wave windings, it is possible to decrease copper loss by 17%.\n
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\n \n\n \n \n Polat, H.; Tosun, N.; Ceylan, D.; and Keysan, O.\n\n\n \n \n \n \n \n Optimization of a Convex Rail Design for Electromagnetic Launchers.\n \n \n \n \n\n\n \n\n\n\n IEEE Transactions on Plasma Science, 48(6): 2266–2273. jun 2020.\n \n\n\n\n
\n\n\n\n \n \n \"OptimizationPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Polat2020,\nabstract = {A rail geometry with a convex cross section instead of a rectangular one provides a higher contact area, uniform current density, and less transition on the contact surface, and it increases the performance in electromagnetic launchers. In addition, the design of convex rails should be considered together with armature structure, the distance between rails, rail length, and parasitic masses that all have an influence on the overall efficiency and armature/rail transition. A novel complete rail and launch package optimization method is presented in this article. In the first part of this article, the optimum convex rail cross sections for five different separation values are found to obtain uniform current density distribution on rail cross section. For this part, a transient finite element (FE) model in 2-D is developed to calculate the current density distribution and combined with a real-coded genetic algorithm (GA). Then, the armature and sabot petal masses are calculated for each optimized rail geometry and each separation values. In the second part, the efficiency of each optimum design with different separation values is evaluated by a transient 3-D FE model with transient solver taking the calculated armature and sabot petal masses into account. Finally, the length of the rails of the final design is investigated for the transition phenomena. It is observed that 48-mm rail separation with 12.9-and 21-mm elliptical cross-sectional parameters has the highest exit velocity (2355 m/s) for 400-g projectile with uniform current density at inner rail surfaces.},\nauthor = {Polat, Hakan and Tosun, Nail and Ceylan, Doga and Keysan, Ozan},\ndoi = {10.1109/TPS.2020.2993785},\nfile = {:home/ozi/Downloads/Optimization_of_a_Convex_Rail_Design_for_Electromagnetic_Launchers.pdf:pdf},\nissn = {0093-3813},\njournal = {IEEE Transactions on Plasma Science},\nkeywords = {Convex rails,electromagnetic launch (EML),finite element (FE) analysis,genetic algorithm (GA),pulsed power supply,railgun},\nmonth = {jun},\nnumber = {6},\npages = {2266--2273},\ntitle = {{Optimization of a Convex Rail Design for Electromagnetic Launchers}},\nurl = {https://ieeexplore.ieee.org/document/9104009/},\nvolume = {48},\nyear = {2020}\n}\n
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\n A rail geometry with a convex cross section instead of a rectangular one provides a higher contact area, uniform current density, and less transition on the contact surface, and it increases the performance in electromagnetic launchers. In addition, the design of convex rails should be considered together with armature structure, the distance between rails, rail length, and parasitic masses that all have an influence on the overall efficiency and armature/rail transition. A novel complete rail and launch package optimization method is presented in this article. In the first part of this article, the optimum convex rail cross sections for five different separation values are found to obtain uniform current density distribution on rail cross section. For this part, a transient finite element (FE) model in 2-D is developed to calculate the current density distribution and combined with a real-coded genetic algorithm (GA). Then, the armature and sabot petal masses are calculated for each optimized rail geometry and each separation values. In the second part, the efficiency of each optimum design with different separation values is evaluated by a transient 3-D FE model with transient solver taking the calculated armature and sabot petal masses into account. Finally, the length of the rails of the final design is investigated for the transition phenomena. It is observed that 48-mm rail separation with 12.9-and 21-mm elliptical cross-sectional parameters has the highest exit velocity (2355 m/s) for 400-g projectile with uniform current density at inner rail surfaces.\n
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\n \n\n \n \n Tokgoz, F.; Cakal, G.; and Keysan, O.\n\n\n \n \n \n \n \n Design and Implementation of an Optimized Printed Circuit Board Axial-Flux Permanent Magnet Machine.\n \n \n \n \n\n\n \n\n\n\n In 2020 International Conference on Electrical Machines (ICEM), pages 111–116, aug 2020. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"DesignPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Tokgoz2020a,\nabstract = {Although axial-flux machines are used in a different variety of applications, production challenge of the stator winding is a limiting factor for more widely use of these machines. Printed circuit board winding (PCB) can mitigate the production challenges of the axial-flux machines by introducing cheap and precise mass production capabilities. In this paper, the design and implementation of an 16 pole, 2000 RPM, 40 W axial-flux permanent magnet machine with PCB winding for gimbal camera stabilization system used in aviation industry is presented. The machine's flux density, induced voltage, number of turns and some other parameters are analytically calculated. Parameters are optimized using a genetic optimization algorithm. The design with highest torque density value is validated by an finite element analysis tool, ANSYS Maxwell. Finally, the prototype is tested at 2000 RPM. In order to check the machine can take the thermal stress, it was put under the full load and the temperature level is recorded. The temperature of the windings did not exceed 45 C under full-load. The efficiency of the motor is found as 72%. Expectations are met by analytical, FEA and test results.},\nauthor = {Tokgoz, Furkan and Cakal, Gokhan and Keysan, Ozan},\nbooktitle = {2020 International Conference on Electrical Machines (ICEM)},\ndoi = {10.1109/ICEM49940.2020.9271058},\nfile = {:home/ozi/Downloads/Design_and_Implementation_of_an_Optimized_Printed_Circuit_Board_Axial-Flux_Permanent_Magnet_Machine.pdf:pdf},\nisbn = {978-1-7281-9945-0},\nkeywords = {Axial flux machine,Coreless motor,Double rotor,Finite element analysis,Optimization,Permanent magnet machine,Printed circuit board (PCB)},\nmonth = {aug},\npages = {111--116},\npublisher = {IEEE},\ntitle = {{Design and Implementation of an Optimized Printed Circuit Board Axial-Flux Permanent Magnet Machine}},\nurl = {https://ieeexplore.ieee.org/document/9271058/},\nyear = {2020}\n}\n
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\n Although axial-flux machines are used in a different variety of applications, production challenge of the stator winding is a limiting factor for more widely use of these machines. Printed circuit board winding (PCB) can mitigate the production challenges of the axial-flux machines by introducing cheap and precise mass production capabilities. In this paper, the design and implementation of an 16 pole, 2000 RPM, 40 W axial-flux permanent magnet machine with PCB winding for gimbal camera stabilization system used in aviation industry is presented. The machine's flux density, induced voltage, number of turns and some other parameters are analytically calculated. Parameters are optimized using a genetic optimization algorithm. The design with highest torque density value is validated by an finite element analysis tool, ANSYS Maxwell. Finally, the prototype is tested at 2000 RPM. In order to check the machine can take the thermal stress, it was put under the full load and the temperature level is recorded. The temperature of the windings did not exceed 45 C under full-load. The efficiency of the motor is found as 72%. Expectations are met by analytical, FEA and test results.\n
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\n \n\n \n \n Temiz, H.; Keysan, O.; and Demirok, E.\n\n\n \n \n \n \n \n Adaptive controller based on grid impedance estimation for stable operation of grid‐connected inverters under weak grid conditions.\n \n \n \n \n\n\n \n\n\n\n IET Power Electronics, 13(13): 2692–2705. oct 2020.\n \n\n\n\n
\n\n\n\n \n \n \"AdaptivePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{Temiz2020,\nabstract = {{\\textcopyright} 2020 Institution of Engineering and Technology. All rights reserved. An electric grid having high impedance seen from the connection point is considered as a weak grid and it adversely affects the system stability of grid-tied voltage source inverters in renewable power devices. In this study, an adaptive controller is proposed by configuring the settling time of the phase-locked loop based on the estimated grid impedance. Pseudorandom binary sequence injection and Fourier techniques are carried out for grid impedance estimation. Impedance-based stability analysis is performed for a predetermined steady-state operation point. The proposed method is verified by a 300-kVA inverter prototype for wide-range grid impedance varying from 0.3 to 3 mH.},\nauthor = {Temiz, Hakan and Keysan, Ozan and Demirok, Erhan},\ndoi = {10.1049/iet-pel.2019.1411},\nfile = {:home/ozi/Downloads/iet-pel.2019.1411.pdf:pdf},\nissn = {1755-4535},\njournal = {IET Power Electronics},\nmonth = {oct},\nnumber = {13},\npages = {2692--2705},\ntitle = {{Adaptive controller based on grid impedance estimation for stable operation of grid‐connected inverters under weak grid conditions}},\nurl = {https://onlinelibrary.wiley.com/doi/10.1049/iet-pel.2019.1411},\nvolume = {13},\nyear = {2020}\n}\n
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\n © 2020 Institution of Engineering and Technology. All rights reserved. An electric grid having high impedance seen from the connection point is considered as a weak grid and it adversely affects the system stability of grid-tied voltage source inverters in renewable power devices. In this study, an adaptive controller is proposed by configuring the settling time of the phase-locked loop based on the estimated grid impedance. Pseudorandom binary sequence injection and Fourier techniques are carried out for grid impedance estimation. Impedance-based stability analysis is performed for a predetermined steady-state operation point. The proposed method is verified by a 300-kVA inverter prototype for wide-range grid impedance varying from 0.3 to 3 mH.\n
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\n \n\n \n \n Sahin, I.; Keysan, O.; and Monmasson, E.\n\n\n \n \n \n \n \n Experimental tuning and design guidelines of a dynamically reconfigured weighting factor for the predictive torque control of an induction motor.\n \n \n \n \n\n\n \n\n\n\n In 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe), pages P.1–P.8, sep 2020. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"ExperimentalPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Sahin2020,\nabstract = {In this study, an experimental approach for the weighting factor design of the predictive torque control of an induction motor (IM) is presented. The weighting factor is set to the value which yields a low total harmonic distortion (THD) figure in the phase currents. Then, this optimized value is dynamically adjusted with respect to the speed error term, which is defined as the magnitude of difference between the commanded speed and the actual speed. By doing so, superior transient performance is achieved without sacrificing steady-state THD values. The presented approach for dynamically adjusted weighting factor is tested on a two-pole, 500 W IM, driven by a two-level voltage source inverter (2L-VSI), via finite control set model predictive control (FCS-MPC). Experimental results show the effectiveness of the proposed method: by the adoption of dynamic lambda approach, speed reversal time from -3000 rpm to +3000 rpm is decreased by 38% under the same controller structure and settings.},\nauthor = {Sahin, Ilker and Keysan, Ozan and Monmasson, Eric},\nbooktitle = {2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)},\ndoi = {10.23919/EPE20ECCEEurope43536.2020.9215739},\nfile = {:home/ozi/Downloads/Experimental_tuning_and_design_guidelines_of_a_dynamically_reconfigured_weighting_factor_for_the_predictive_torque_control_of_an_induction_motor.pdf:pdf},\nisbn = {978-9-0758-1536-8},\nkeywords = {Adjustable speed drive,Drive,Highly dynamic drive,Induction motor,MPC (Model-based Predictive Control)},\nmonth = {sep},\npages = {P.1--P.8},\npublisher = {IEEE},\ntitle = {{Experimental tuning and design guidelines of a dynamically reconfigured weighting factor for the predictive torque control of an induction motor}},\nurl = {https://ieeexplore.ieee.org/document/9215739/},\nyear = {2020}\n}\n
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\n In this study, an experimental approach for the weighting factor design of the predictive torque control of an induction motor (IM) is presented. The weighting factor is set to the value which yields a low total harmonic distortion (THD) figure in the phase currents. Then, this optimized value is dynamically adjusted with respect to the speed error term, which is defined as the magnitude of difference between the commanded speed and the actual speed. By doing so, superior transient performance is achieved without sacrificing steady-state THD values. The presented approach for dynamically adjusted weighting factor is tested on a two-pole, 500 W IM, driven by a two-level voltage source inverter (2L-VSI), via finite control set model predictive control (FCS-MPC). Experimental results show the effectiveness of the proposed method: by the adoption of dynamic lambda approach, speed reversal time from -3000 rpm to +3000 rpm is decreased by 38% under the same controller structure and settings.\n
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\n \n\n \n \n Sahin, I.; Bayazit, G. H.; and Keysan, O.\n\n\n \n \n \n \n \n A Simulink Model for the Induction Machine with an Inter-Turn Short Circuit Fault.\n \n \n \n \n\n\n \n\n\n\n In 2020 International Conference on Electrical Machines (ICEM), pages 1273–1279, aug 2020. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"APaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Sahin2020a,\nabstract = {In this study, an analytical model for the induction machine (IM) with an inter-turn short circuit (ITSC) fault is developed based on the voltage-behind-reactance (VBR) approach. The main motivation is to provide a simulation tool that can be used for fault detection and condition monitoring research. The proposed simulation model is implemented in Simulink, and compared with the outcomes of both finite element analysis (FEA) and experimental studies. The results show the effectiveness of the proposed model as a simple simulation tool for the analysis of IMs with ITSC faults. The proposed Simulink model has been made available as opensource.},\nauthor = {Sahin, I. and Bayazit, G. H. and Keysan, O.},\nbooktitle = {2020 International Conference on Electrical Machines (ICEM)},\ndoi = {10.1109/ICEM49940.2020.9270853},\nfile = {:home/ozi/Downloads/A_Simulink_Model_for_the_Induction_Machine_with_an_Inter-Turn_Short_Circuit_Fault.pdf:pdf},\nisbn = {978-1-7281-9945-0},\nkeywords = {Analytical model,Computer simulation,Fault diagnosis,Induction motor},\nmonth = {aug},\npages = {1273--1279},\npublisher = {IEEE},\ntitle = {{A Simulink Model for the Induction Machine with an Inter-Turn Short Circuit Fault}},\nurl = {https://ieeexplore.ieee.org/document/9270853/},\nyear = {2020}\n}\n
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\n In this study, an analytical model for the induction machine (IM) with an inter-turn short circuit (ITSC) fault is developed based on the voltage-behind-reactance (VBR) approach. The main motivation is to provide a simulation tool that can be used for fault detection and condition monitoring research. The proposed simulation model is implemented in Simulink, and compared with the outcomes of both finite element analysis (FEA) and experimental studies. The results show the effectiveness of the proposed model as a simple simulation tool for the analysis of IMs with ITSC faults. The proposed Simulink model has been made available as opensource.\n
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\n \n\n \n \n Akgemci, A.; and Keysan, O.\n\n\n \n \n \n \n \n Design and Analysis of a 2.5 MW Hybrid Excited Synchronous Wind Turbine Generator With Two Separate Rotors.\n \n \n \n \n\n\n \n\n\n\n In 2020 International Conference on Electrical Machines (ICEM), pages 1862–1867, aug 2020. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"DesignPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Akgemci2020,\nabstract = {In this paper, a 2.5 MW 16 rpm hybrid excited synchronous generator (HESG) is designed for direct drive wind turbine applications where two separate rotors for permanent magnet (PM) and DC excited field windings are utilized simultaneously. As a result, output voltage of the generator is due to the combination of the fixed field from the PM rotor and a variable field from wound field (WF) rotor. A model is constructed using a cost optimized 2.5 MW Permanent Magnet Synchronous Generator and it is simulated by using finite element method (FEM). The feasibility of the topology and the controllability range determined by the dominance of the excitation types are discussed. Finally, the design is compared with synchronous generators with single excitation type at the same ratings. The designed HESG yields 26% reduction in PM magnet amount compared to a PMSG at the cost of slightly reduced efficiency and power factor.},\nauthor = {Akgemci, A. and Keysan, O.},\nbooktitle = {2020 International Conference on Electrical Machines (ICEM)},\ndoi = {10.1109/ICEM49940.2020.9270739},\nfile = {:home/ozi/Downloads/Design_and_Analysis_of_a_2.5_MW_Hybrid_Excited_Synchronous_Wind_Turbine_Generator_With_Two_Separate_Rotors.pdf:pdf},\nisbn = {978-1-7281-9945-0},\nkeywords = {FEM simulation,Hybrid excited synchronous machine,Multi-objective optimization,Wind turbine generator design},\nmonth = {aug},\npages = {1862--1867},\npublisher = {IEEE},\ntitle = {{Design and Analysis of a 2.5 MW Hybrid Excited Synchronous Wind Turbine Generator With Two Separate Rotors}},\nurl = {https://ieeexplore.ieee.org/document/9270739/},\nyear = {2020}\n}\n
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\n In this paper, a 2.5 MW 16 rpm hybrid excited synchronous generator (HESG) is designed for direct drive wind turbine applications where two separate rotors for permanent magnet (PM) and DC excited field windings are utilized simultaneously. As a result, output voltage of the generator is due to the combination of the fixed field from the PM rotor and a variable field from wound field (WF) rotor. A model is constructed using a cost optimized 2.5 MW Permanent Magnet Synchronous Generator and it is simulated by using finite element method (FEM). The feasibility of the topology and the controllability range determined by the dominance of the excitation types are discussed. Finally, the design is compared with synchronous generators with single excitation type at the same ratings. The designed HESG yields 26% reduction in PM magnet amount compared to a PMSG at the cost of slightly reduced efficiency and power factor.\n
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\n \n\n \n \n Bayazit, G. H.; Ugur, M.; and Keysan, O.\n\n\n \n \n \n \n \n Fault Tolerance Capabilities of Three, Four and Six-Phase Configurations of a 24 Slot Modular PMSM.\n \n \n \n \n\n\n \n\n\n\n In 2019 IEEE 13th International Conference on Power Electronics and Drive Systems (PEDS), volume 2019-July, pages 1–6, jul 2019. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"FaultPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@inproceedings{Bayazit2019,\nabstract = {In this study, fault tolerance and redundancy capabilities of different phase and winding configurations of an Integrated Modular Motor Drive (IMMD) system are investigated. This is made possible by manipulating gate drive signals of the inverter and phase connections. Three and four phase connections as well as symmetric and asymmetric six-phase topologies are described. Control strategies and redundancy possibilities of these different topologies under an open circuit fault condition are examined in MATLAB/Simulink environment and validated with Finite Element Analysis (FEA) software ANSYS/Maxwell. Considering a decrease of only 12% in average output torque and 0.7% torque ripple under an open circuit failure recovery operation with rated currents, symmetric six-phase topology is decided to be the most promising configuration by means of fault tolerance.},\nauthor = {Bayazit, Goksenin Hande and Ugur, Mesut and Keysan, Ozan},\nbooktitle = {2019 IEEE 13th International Conference on Power Electronics and Drive Systems (PEDS)},\ndoi = {10.1109/PEDS44367.2019.8998851},\nfile = {:home/ozi/Downloads/Fault_Tolerance_Capabilities_of_Three_Four_and_Six-Phase_Configurations_of_a_24_Slot_Modular_PMSM.pdf:pdf},\nisbn = {978-1-5386-6499-5},\nissn = {21645264},\nmonth = {jul},\nnumber = {Immd},\npages = {1--6},\npublisher = {IEEE},\ntitle = {{Fault Tolerance Capabilities of Three, Four and Six-Phase Configurations of a 24 Slot Modular PMSM}},\nurl = {https://ieeexplore.ieee.org/document/8998851/},\nvolume = {2019-July},\nyear = {2019}\n}\n
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\n In this study, fault tolerance and redundancy capabilities of different phase and winding configurations of an Integrated Modular Motor Drive (IMMD) system are investigated. This is made possible by manipulating gate drive signals of the inverter and phase connections. Three and four phase connections as well as symmetric and asymmetric six-phase topologies are described. Control strategies and redundancy possibilities of these different topologies under an open circuit fault condition are examined in MATLAB/Simulink environment and validated with Finite Element Analysis (FEA) software ANSYS/Maxwell. Considering a decrease of only 12% in average output torque and 0.7% torque ripple under an open circuit failure recovery operation with rated currents, symmetric six-phase topology is decided to be the most promising configuration by means of fault tolerance.\n
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\n \n\n \n \n Yuruk, H.; Keysan, O.; and Ulutas, B.\n\n\n \n \n \n \n \n High Bandwidth Current Control via Nonlinear Compensation and GaN-based VSI.\n \n \n \n \n\n\n \n\n\n\n In 2019 IEEE 13th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG), pages 1–7, apr 2019. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"HighPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Yuruk2019a,\nabstract = {Nonlinearities in the voltage source inverter (VSI) such as dead time, switching time, delay time, voltage drops on the power switches, parasitic capacitances etc. are considered to be the main sources of the output voltage distortions. These distortions result in low order harmonics in the output current, which in turn increase core losses and create torque ripples. In particular, in the low speed and low torque applications the control performance and the stability of the system degrades substantially. Although as the switching frequency increases the effects of the dead time, the switching time and the delay time become more notable, to achieve a high current control bandwidth higher switching frequency is required. High performance VSI-fed motor drive can be realized both by reducing the effects of the VSI nonlinearities and by having a high current control bandwidth. In this work, GaN transistor based VSI-fed permanent magnet synchronous motor (PMSM) drive is used to achieve a high current control bandwidth. Since the current loop is the inner most loop of the control loop, it enables the outer speed and position loops to be faster. This high performance servo motor drive can be used in applications such as control of pedestals, robot arms, optic stabilizers, CNC machines, active vibration cancellers etc. that require high control bandwidths.},\nauthor = {Yuruk, Huseyin and Keysan, Ozan and Ulutas, Baris},\nbooktitle = {2019 IEEE 13th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG)},\ndoi = {10.1109/CPE.2019.8862414},\nisbn = {978-1-7281-3202-0},\nkeywords = {Dead time,GaN based VSI,Nonlinearities,Permanent magnet synchronous motor,Pulse width modulation inverter},\nmonth = {apr},\npages = {1--7},\npublisher = {IEEE},\ntitle = {{High Bandwidth Current Control via Nonlinear Compensation and GaN-based VSI}},\nurl = {https://ieeexplore.ieee.org/document/8862414/},\nyear = {2019}\n}\n
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\n Nonlinearities in the voltage source inverter (VSI) such as dead time, switching time, delay time, voltage drops on the power switches, parasitic capacitances etc. are considered to be the main sources of the output voltage distortions. These distortions result in low order harmonics in the output current, which in turn increase core losses and create torque ripples. In particular, in the low speed and low torque applications the control performance and the stability of the system degrades substantially. Although as the switching frequency increases the effects of the dead time, the switching time and the delay time become more notable, to achieve a high current control bandwidth higher switching frequency is required. High performance VSI-fed motor drive can be realized both by reducing the effects of the VSI nonlinearities and by having a high current control bandwidth. In this work, GaN transistor based VSI-fed permanent magnet synchronous motor (PMSM) drive is used to achieve a high current control bandwidth. Since the current loop is the inner most loop of the control loop, it enables the outer speed and position loops to be faster. This high performance servo motor drive can be used in applications such as control of pedestals, robot arms, optic stabilizers, CNC machines, active vibration cancellers etc. that require high control bandwidths.\n
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\n \n\n \n \n Alemdar, O. S.; Karakaya, F.; and Keysan, O.\n\n\n \n \n \n \n \n PCB Layout Based Short-Circuit Protection Scheme for GaN HEMTs.\n \n \n \n \n\n\n \n\n\n\n In 2019 IEEE Energy Conversion Congress and Exposition (ECCE), pages 2212–2218, sep 2019. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"PCBPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Alemdar2019a,\nabstract = {{\\textcopyright} 2019 IEEE. Gallium Nitride Enhancement-Mode High Electron Mobility Transistors (GaN HEMTs) are superior to other power transistors in terms of efficiency, package size and switching speed which leads to increased power density in power converter applications. However, GaN HEMTs have much shorter short-circuit withstand time compared to the conventional devices, which is limited to several hundred nanoseconds. Therefore, reliable and fast protection solutions are required to protect GaN HEMTs from fatal over-current failures. In this paper, a novel short-circuit (SC) protection scheme based on fault current sensing by using Printed Circuit Board (PCB) layout parasitics is proposed. The proposed scheme uses the voltage drop on the parasitic inductance of the PCB trace to detect very intense high slew rate SC faults. In addition, the voltage drop on the parasitic resistance of the PCB trace is utilized to detect relatively slow over-current (OC) faults. Once a fault is detected, a soft turn-off mechanism is initiated by the proposed circuit to turnoff devices gradually to eliminate over-voltage breakdown risk. The proposed circuit is verified by both SPICE simulations and hardware implementation. The experimental results show that both SC and OC faults can be detected and GaN HEMTs can be protected. The total operation duration for the circuit is 370 ns during a SC fault. The SC fault can be detected within 30 ns and the soft turn-off mechanism is initiated within 80 ns to terminate the SC current flowing through the GaN HEMTs within 290 ns.},\nauthor = {Alemdar, Ozturk Sahin and Karakaya, Furkan and Keysan, Ozan},\nbooktitle = {2019 IEEE Energy Conversion Congress and Exposition (ECCE)},\ndoi = {10.1109/ECCE.2019.8913081},\nisbn = {978-1-7281-0395-2},\nkeywords = {Fault,GaN HEMT,Gallium nitride,Over-current protection,Short-circuit protection},\nmonth = {sep},\npages = {2212--2218},\npublisher = {IEEE},\ntitle = {{PCB Layout Based Short-Circuit Protection Scheme for GaN HEMTs}},\nurl = {https://ieeexplore.ieee.org/document/8913081/},\nyear = {2019}\n}\n
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\n © 2019 IEEE. Gallium Nitride Enhancement-Mode High Electron Mobility Transistors (GaN HEMTs) are superior to other power transistors in terms of efficiency, package size and switching speed which leads to increased power density in power converter applications. However, GaN HEMTs have much shorter short-circuit withstand time compared to the conventional devices, which is limited to several hundred nanoseconds. Therefore, reliable and fast protection solutions are required to protect GaN HEMTs from fatal over-current failures. In this paper, a novel short-circuit (SC) protection scheme based on fault current sensing by using Printed Circuit Board (PCB) layout parasitics is proposed. The proposed scheme uses the voltage drop on the parasitic inductance of the PCB trace to detect very intense high slew rate SC faults. In addition, the voltage drop on the parasitic resistance of the PCB trace is utilized to detect relatively slow over-current (OC) faults. Once a fault is detected, a soft turn-off mechanism is initiated by the proposed circuit to turnoff devices gradually to eliminate over-voltage breakdown risk. The proposed circuit is verified by both SPICE simulations and hardware implementation. The experimental results show that both SC and OC faults can be detected and GaN HEMTs can be protected. The total operation duration for the circuit is 370 ns during a SC fault. The SC fault can be detected within 30 ns and the soft turn-off mechanism is initiated within 80 ns to terminate the SC current flowing through the GaN HEMTs within 290 ns.\n
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\n \n\n \n \n Polat, H.; Ceylan, D.; and Keysan, O.\n\n\n \n \n \n \n \n Utilization and Optimization of Superconducting Coil Parameters in Electromagnetic Launcher Systems.\n \n \n \n \n\n\n \n\n\n\n In 2019 IEEE Pulsed Power & Plasma Science (PPPS), volume 2019-June, pages 1–6, jun 2019. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"UtilizationPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Polat2019,\nabstract = {The utilization of external field windings in electromagnetic launchers provides an additional electromagnetic field between the rails of an electromagnetic launcher which increases the Lorentz force acting on the armature in the acceleration direction. However, additional magnetic field created by the conventional copper windings are very limited due to their low maximum current carrying capability. Therefore, using high temperature superconductors (HTS) with a current carrying capability up to 100 A/mm2 for the external coils can be used to increase the magnetic field density between rails. This paper presents an optimization study for the design of two external coils with rectangular tape YBCO superconducting wire. The HTS coils are proposed to increase the efficiency of a 3 meter long launcher with 25 mm x 20 mm rectangular bore caliber. The optimization parameters are selected as the magnitude of the DC coil current, the coil position, the number of turns of the coil, and the number of coil layers. Also, the objective function of the optimization is the electromagnetic force acting on the armature, which is dependent of the rail current and B field on the armature. During the operation of the launcher and the external coils, it is critical to prevent quenching of the HTS coils due to the perpendicular and tangential magnetic field on the coils, temperature and current density of the coils. In order to estimate the quench and calculate the objective function, finite element analysis (FEA) is used in 2D. Real coded genetic algorithm (RCGA) is also used as optimization method. The results of the optimization study shows that HTS coil augmentation is feasible for small caliber railguns. The HTS coil position is limited by cryogenic chamber and rail containment dimensions. The maximum coil current is determined by the self field due to cancellation B field generated by the rails and the coils. For 500 kA rail current the force acting on the armature increases from 55 kN to 70 kN with and increase rate of 26%, a muzzle velocity increase from 1650 m/s to 1900 m/s with an increase rate of 12% and a muzzle energy increase from 160 kJ to 210 kJ with and increase rate of 25% when external HTS coil augmentation is used.},\nauthor = {Polat, Hakan and Ceylan, Doga and Keysan, Ozan},\nbooktitle = {2019 IEEE Pulsed Power & Plasma Science (PPPS)},\ndoi = {10.1109/PPPS34859.2019.9009612},\nfile = {:home/ozi/Downloads/Utilization_and_Optimization_of_Superconducting_Coil_Parameters_in_Electromagnetic_Launcher_Systems.pdf:pdf},\nisbn = {978-1-5386-7969-2},\nissn = {21584923},\nkeywords = {Electromagnetic launch,finite element analysis,genetic algorithm,high temperature superconducting(HTS) coil,pulsed power supply,railgun},\nmonth = {jun},\npages = {1--6},\npublisher = {IEEE},\ntitle = {{Utilization and Optimization of Superconducting Coil Parameters in Electromagnetic Launcher Systems}},\nurl = {https://ieeexplore.ieee.org/document/9009612/},\nvolume = {2019-June},\nyear = {2019}\n}\n
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\n The utilization of external field windings in electromagnetic launchers provides an additional electromagnetic field between the rails of an electromagnetic launcher which increases the Lorentz force acting on the armature in the acceleration direction. However, additional magnetic field created by the conventional copper windings are very limited due to their low maximum current carrying capability. Therefore, using high temperature superconductors (HTS) with a current carrying capability up to 100 A/mm2 for the external coils can be used to increase the magnetic field density between rails. This paper presents an optimization study for the design of two external coils with rectangular tape YBCO superconducting wire. The HTS coils are proposed to increase the efficiency of a 3 meter long launcher with 25 mm x 20 mm rectangular bore caliber. The optimization parameters are selected as the magnitude of the DC coil current, the coil position, the number of turns of the coil, and the number of coil layers. Also, the objective function of the optimization is the electromagnetic force acting on the armature, which is dependent of the rail current and B field on the armature. During the operation of the launcher and the external coils, it is critical to prevent quenching of the HTS coils due to the perpendicular and tangential magnetic field on the coils, temperature and current density of the coils. In order to estimate the quench and calculate the objective function, finite element analysis (FEA) is used in 2D. Real coded genetic algorithm (RCGA) is also used as optimization method. The results of the optimization study shows that HTS coil augmentation is feasible for small caliber railguns. The HTS coil position is limited by cryogenic chamber and rail containment dimensions. The maximum coil current is determined by the self field due to cancellation B field generated by the rails and the coils. For 500 kA rail current the force acting on the armature increases from 55 kN to 70 kN with and increase rate of 26%, a muzzle velocity increase from 1650 m/s to 1900 m/s with an increase rate of 12% and a muzzle energy increase from 160 kJ to 210 kJ with and increase rate of 25% when external HTS coil augmentation is used.\n
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\n \n\n \n \n Ceylan, D.; Pourkeivannour, S.; and Keysan, O.\n\n\n \n \n \n \n \n A Comparative Study of Capacitive and Inductive Pulsed Power Supply Topologies for Electromagnetic Launcher Applications.\n \n \n \n \n\n\n \n\n\n\n In 2019 International Aegean Conference on Electrical Machines and Power Electronics (ACEMP) & 2019 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM), pages 297–303, aug 2019. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"APaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Ceylan2019b,\nabstract = {Inductive and capacitive types are the most common pulsed power supply (PPS) topologies. In this paper, the comparison of inductive XRAM generator and capacitor-based (C-based) generator topologies is discussed for the excitation of an electromagnetic launcher (EML). In addition, the effect of capacitance or inductance of the storage element on the load current and laucher efficiency is investigated. The circuit simulation results of these PPS topologies are presented, each of which having 200 kJ PPS energy. The EML used in the study has 0.1 kg total mass of projectile, 3 m long rail. Although the energy density of the XRAM generators is larger than C-based PPSs, the design of an XRAM generator is more challenging than C-based PPS due to the large voltage drop of its opening switches. Moreover, the efficiency of the total system is highly dependent on the design of the storage element. For the XRAM generator, the efficiency is limited by the capability of the opening switches. In this study, using RC snubber circuit, the voltage stress on the GTO (gate turn-off) thyristor opening switches of the XRAM generator is decreased to 2 kV peak voltage, which is available in the market.},\nauthor = {Ceylan, Doga and Pourkeivannour, Siamak and Keysan, Ozan},\nbooktitle = {2019 International Aegean Conference on Electrical Machines and Power Electronics (ACEMP) & 2019 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)},\ndoi = {10.1109/ACEMP-OPTIM44294.2019.9007196},\nfile = {:home/ozi/Downloads/A_Comparative_Study_of_Capacitive_and_Inductive_Pulsed_Power_Supply_Topologies_for_Electromagnetic_Launcher_Applications.pdf:pdf},\nisbn = {978-1-5386-7687-5},\nkeywords = {C-based pulsed power supply,Pulsed power generation,XRAM generator,electromagnetic launcher,opening switch},\nmonth = {aug},\npages = {297--303},\npublisher = {IEEE},\ntitle = {{A Comparative Study of Capacitive and Inductive Pulsed Power Supply Topologies for Electromagnetic Launcher Applications}},\nurl = {https://ieeexplore.ieee.org/document/9007196/},\nyear = {2019}\n}\n
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\n Inductive and capacitive types are the most common pulsed power supply (PPS) topologies. In this paper, the comparison of inductive XRAM generator and capacitor-based (C-based) generator topologies is discussed for the excitation of an electromagnetic launcher (EML). In addition, the effect of capacitance or inductance of the storage element on the load current and laucher efficiency is investigated. The circuit simulation results of these PPS topologies are presented, each of which having 200 kJ PPS energy. The EML used in the study has 0.1 kg total mass of projectile, 3 m long rail. Although the energy density of the XRAM generators is larger than C-based PPSs, the design of an XRAM generator is more challenging than C-based PPS due to the large voltage drop of its opening switches. Moreover, the efficiency of the total system is highly dependent on the design of the storage element. For the XRAM generator, the efficiency is limited by the capability of the opening switches. In this study, using RC snubber circuit, the voltage stress on the GTO (gate turn-off) thyristor opening switches of the XRAM generator is decreased to 2 kV peak voltage, which is available in the market.\n
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\n \n\n \n \n Sahin, I.; and Keysan, O.\n\n\n \n \n \n \n \n A simplified discrete-time implementation of FCS-MPC applied to an IM drive.\n \n \n \n \n\n\n \n\n\n\n In 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe), pages P.1–P.8, sep 2019. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"APaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Sahin2019,\nabstract = {{\\textcopyright} 2019 EPE Association. Model predictive control (MPC) has drawn significant attention from the power electronics research community in the last decade. Regarding the application of MPC in motor control, several studies have been conducted that include design and implementation of various predictive torque control techniques. In this study, MPC of an induction motor is implemented via TMDXIDDK379D, a motor drive development platform produced by Texas Instruments (TI). The main motivation is to show the engineers and researchers a way of simple, fast and low cost experimentation on MPC. By using an off the shelf motor drive development platform and modifying the existing macros and libraries for motor control, the implementation time and difficulty can be reduced considerably. Extensive experimental data on the drive performance is also provided.},\nauthor = {Sahin, Ilker and Keysan, Ozan},\nbooktitle = {2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe)},\ndoi = {10.23919/EPE.2019.8915204},\nisbn = {978-9-0758-1531-3},\nkeywords = {DSP,Digital Motor Control,Model Predictive Control,Predictive Torque Control},\nmonth = {sep},\npages = {P.1--P.8},\npublisher = {IEEE},\ntitle = {{A simplified discrete-time implementation of FCS-MPC applied to an IM drive}},\nurl = {https://ieeexplore.ieee.org/document/8915204/},\nyear = {2019}\n}\n
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\n © 2019 EPE Association. Model predictive control (MPC) has drawn significant attention from the power electronics research community in the last decade. Regarding the application of MPC in motor control, several studies have been conducted that include design and implementation of various predictive torque control techniques. In this study, MPC of an induction motor is implemented via TMDXIDDK379D, a motor drive development platform produced by Texas Instruments (TI). The main motivation is to show the engineers and researchers a way of simple, fast and low cost experimentation on MPC. By using an off the shelf motor drive development platform and modifying the existing macros and libraries for motor control, the implementation time and difficulty can be reduced considerably. Extensive experimental data on the drive performance is also provided.\n
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\n \n\n \n \n Cakal, G.; and Keysan, O.\n\n\n \n \n \n \n \n Design of Double Sided Linear Motor with Easy to Manufacture Hairpin Plate Winding.\n \n \n \n \n\n\n \n\n\n\n In 2019 12th International Symposium on Linear Drives for Industry Applications (LDIA), pages 1–5, jul 2019. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"DesignPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Cakal2019a,\nabstract = {{\\textcopyright} 2019 IEEE. This paper presents a double sided permanent magnet linear synchronous motor (DSPMLSM) with novel V-shaped hairpin plate windings and diagonally placed square magnets. Unlike the conventional stranded round wires, proposed winding type offers easy manufacturing and high current densities. Air cored structure eliminates problems related to cogging torque. In order to obtain fast results, analytical magnetic field model of the motor is derived using magnetic scalar potential and verified with finite element analysis. Optimization using genetic algorithm is executed with analytical model, and 1 kW, 150 N, and 30 A DSPMLSM is proposed.},\nauthor = {Cakal, Gokhan and Keysan, Ozan},\nbooktitle = {2019 12th International Symposium on Linear Drives for Industry Applications (LDIA)},\ndoi = {10.1109/LDIA.2019.8771020},\nisbn = {978-1-5386-5804-8},\nkeywords = {V-shaped hairpin plate winding,easy manufacturing,magnetic scalar potential,optimization},\nmonth = {jul},\npages = {1--5},\npublisher = {IEEE},\ntitle = {{Design of Double Sided Linear Motor with Easy to Manufacture Hairpin Plate Winding}},\nurl = {https://ieeexplore.ieee.org/document/8771020/},\nyear = {2019}\n}\n
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\n © 2019 IEEE. This paper presents a double sided permanent magnet linear synchronous motor (DSPMLSM) with novel V-shaped hairpin plate windings and diagonally placed square magnets. Unlike the conventional stranded round wires, proposed winding type offers easy manufacturing and high current densities. Air cored structure eliminates problems related to cogging torque. In order to obtain fast results, analytical magnetic field model of the motor is derived using magnetic scalar potential and verified with finite element analysis. Optimization using genetic algorithm is executed with analytical model, and 1 kW, 150 N, and 30 A DSPMLSM is proposed.\n
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\n \n\n \n \n Zeinali, R.; and Keysan, O.\n\n\n \n \n \n \n \n A Rare-Earth Free Magnetically Geared Generator for Direct-Drive Wind Turbines.\n \n \n \n \n\n\n \n\n\n\n Energies, 12(3): 447. jan 2019.\n \n\n\n\n
\n\n\n\n \n \n \"APaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Zeinali2019,\nabstract = {A novel Vernier type magnetically geared direct-drive generator for large wind turbines is introduced in this paper. Conventional Vernier-type machines and most of the direct-drive wind turbine generators use excessive amount of permanent magnet, which increases the overall cost and makes the manufacturing process challenging. In this paper, an electrically excited (PM_less) claw-pole type Vernier machine is presented. This new topology has the potential of reducing mass and cost of the generator, and can make the construction easy in manufacturing and handling. Analytical designs are verified using 3D finite-element simulations and several designs are evaluated to find the optimum design for a 7.5 MW, 12 rpm wind turbine application. It is shown, that the required torque can be achieved with an outer diameter of 7.5 m, and with a mass of 172 t (including the structural mass). The proposed generator is compared with commercial direct-drive generators, and it is found that the proposed generator has the highest torque density with 34.7 kNm/t.},\nauthor = {Zeinali, Reza and Keysan, Ozan},\ndoi = {10.3390/en12030447},\nfile = {::},\nissn = {1996-1073},\njournal = {Energies},\nkeywords = {Direct-drive generators,Magnetic-geared generators,Vernier type machines,Wind turbines},\nmonth = {jan},\nnumber = {3},\npages = {447},\ntitle = {{A Rare-Earth Free Magnetically Geared Generator for Direct-Drive Wind Turbines}},\nurl = {http://www.mdpi.com/1996-1073/12/3/447},\nvolume = {12},\nyear = {2019}\n}\n
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\n A novel Vernier type magnetically geared direct-drive generator for large wind turbines is introduced in this paper. Conventional Vernier-type machines and most of the direct-drive wind turbine generators use excessive amount of permanent magnet, which increases the overall cost and makes the manufacturing process challenging. In this paper, an electrically excited (PM_less) claw-pole type Vernier machine is presented. This new topology has the potential of reducing mass and cost of the generator, and can make the construction easy in manufacturing and handling. Analytical designs are verified using 3D finite-element simulations and several designs are evaluated to find the optimum design for a 7.5 MW, 12 rpm wind turbine application. It is shown, that the required torque can be achieved with an outer diameter of 7.5 m, and with a mass of 172 t (including the structural mass). The proposed generator is compared with commercial direct-drive generators, and it is found that the proposed generator has the highest torque density with 34.7 kNm/t.\n
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\n \n\n \n \n Mueller, M. A.; Burchell, J.; Chong, Y. C.; Keysan, O.; McDonald, A.; Galbraith, M.; and Echenique Subiabre, E. J. P.\n\n\n \n \n \n \n \n Improving the Thermal Performance of Rotary and Linear Air-Cored Permanent Magnet Machines for Direct Drive Wind and Wave Energy Applications.\n \n \n \n \n\n\n \n\n\n\n IEEE Transactions on Energy Conversion, 34(2): 773–781. jun 2019.\n \n\n\n\n
\n\n\n\n \n \n \"ImprovingPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Mueller2019,\nauthor = {Mueller, Markus A. and Burchell, Joseph and Chong, Yew Chuan and Keysan, Ozan and McDonald, Alasdair and Galbraith, Mike and {Echenique Subiabre}, Estanislao J. P.},\ndoi = {10.1109/TEC.2018.2881340},\nfile = {::},\nissn = {0885-8969},\njournal = {IEEE Transactions on Energy Conversion},\nkeywords = {Air-cored windings,Direct drive,Linear machines,Pm machines,Thermal performance,Wave energy,Wind energy},\nmonth = {jun},\nnumber = {2},\npages = {773--781},\npublisher = {IEEE},\ntitle = {{Improving the Thermal Performance of Rotary and Linear Air-Cored Permanent Magnet Machines for Direct Drive Wind and Wave Energy Applications}},\nurl = {https://ieeexplore.ieee.org/document/8534445/},\nvolume = {34},\nyear = {2019}\n}\n
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\n \n\n \n \n Ceylan, D.; Karagoz, M.; Cevik, Y.; Yildirim, B.; Polat, H.; and Keysan, O.\n\n\n \n \n \n \n \n Simulations and Experiments of EMFY-1 Electromagnetic Launcher.\n \n \n \n \n\n\n \n\n\n\n IEEE Transactions on Plasma Science, 47(7): 3336–3343. jul 2019.\n \n\n\n\n
\n\n\n\n \n \n \"SimulationsPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Ceylan2019,\nauthor = {Ceylan, Doga and Karagoz, Mustafa and Cevik, Yasin and Yildirim, Baran and Polat, Hakan and Keysan, Ozan},\ndoi = {10.1109/TPS.2019.2916220},\nfile = {::},\nissn = {0093-3813},\njournal = {IEEE Transactions on Plasma Science},\nkeywords = {Electromagnetic launch,finite element (FE) analysis,pulsed-power supply (PPS),railgun},\nmonth = {jul},\nnumber = {7},\npages = {3336--3343},\ntitle = {{Simulations and Experiments of EMFY-1 Electromagnetic Launcher}},\nurl = {https://ieeexplore.ieee.org/document/8727719/},\nvolume = {47},\nyear = {2019}\n}\n
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\n \n\n \n \n Cakal, G.; and Keysan, O.\n\n\n \n \n \n \n \n Design of Double Sided Linear Motor with Easy to Manufacture Hairpin Plate Winding.\n \n \n \n \n\n\n \n\n\n\n In 2019 12th International Symposium on Linear Drives for Industry Applications (LDIA), pages 1–5, jul 2019. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"DesignPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@inproceedings{Cakal2019,\nauthor = {Cakal, Gokhan and Keysan, Ozan},\nbooktitle = {2019 12th International Symposium on Linear Drives for Industry Applications (LDIA)},\ndoi = {10.1109/LDIA.2019.8771020},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Cakal, Keysan - 2019 - Design of Double Sided Linear Motor with Easy to Manufacture Hairpin Plate Winding.pdf:pdf},\nisbn = {978-1-5386-5804-8},\nmonth = {jul},\nnumber = {d},\npages = {1--5},\npublisher = {IEEE},\ntitle = {{Design of Double Sided Linear Motor with Easy to Manufacture Hairpin Plate Winding}},\nurl = {https://ieeexplore.ieee.org/document/8771020/},\nyear = {2019}\n}\n
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\n \n\n \n \n Ertekin, Ş.; Keysan, O.; Göl, M.; Bayazıt, H.; Yıldız, T.; Marr, A.; Ganji, M.; Teimourzadeh, S.; Tör, O. B.; and Özkavaf, S.\n\n\n \n \n \n \n \n METU Smart Campus Project (iEAST).\n \n \n \n \n\n\n \n\n\n\n In Lecture Notes in Networks and Systems, volume 76, pages 287–297. 2019.\n \n\n\n\n
\n\n\n\n \n \n \"METUPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@incollection{Ertekin2019,\nauthor = {Ertekin, Şeyda and Keysan, Ozan and G{\\"{o}}l, Murat and Bayazıt, Hande and Yıldız, Tuna and Marr, Andrea and Ganji, Mehdi and Teimourzadeh, Saeed and T{\\"{o}}r, Osman B{\\"{u}}lent and {\\"{O}}zkavaf, Sıla},\nbooktitle = {Lecture Notes in Networks and Systems},\ndoi = {10.1007/978-3-030-18072-0_34},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Ertekin et al. - 2019 - METU Smart Campus Project (iEAST).pdf:pdf},\nisbn = {9783030180720},\nissn = {23673389},\nkeywords = {Energy efficiency,Smart buildings,Smart campus,Smart city,Transportation,Water management},\npages = {287--297},\ntitle = {{METU Smart Campus Project (iEAST)}},\nurl = {http://link.springer.com/10.1007/978-3-030-18072-0_34},\nvolume = {76},\nyear = {2019}\n}\n
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\n \n\n \n \n Temiz, H.; Demirok, E.; Keysan, O.; Türkay, A.; and Çetinkaya, B.\n\n\n \n \n \n \n \n Performance comparison of passive series R and shunt R-C damped LCL filter for grid-connected inverters.\n \n \n \n \n\n\n \n\n\n\n The Journal of Engineering, 2019(18): 4698–4702. jul 2019.\n \n\n\n\n
\n\n\n\n \n \n \"PerformancePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{Temiz2019,\nauthor = {Temiz, Hakan and Demirok, Erhan and Keysan, Ozan and T{\\"{u}}rkay, Ali and {\\c{C}}etinkaya, Burak},\ndoi = {10.1049/joe.2018.9321},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Temiz et al. - 2019 - Performance comparison of passive series R and shunt R-C damped LCL filter for grid-connected inverters.pdf:pdf},\nissn = {2051-3305},\njournal = {The Journal of Engineering},\nmonth = {jul},\nnumber = {18},\npages = {4698--4702},\ntitle = {{Performance comparison of passive series R and shunt R-C damped LCL filter for grid-connected inverters}},\nurl = {https://digital-library.theiet.org/content/journals/10.1049/joe.2018.9321},\nvolume = {2019},\nyear = {2019}\n}\n
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\n \n\n \n \n Uğur, M.; and Keysan, O.\n\n\n \n \n \n \n \n Multi‐physics design optimisation of a GaN‐based integrated modular motor drive system.\n \n \n \n \n\n\n \n\n\n\n The Journal of Engineering, 2019(17): 3900–3905. jun 2019.\n \n\n\n\n
\n\n\n\n \n \n \"Multi‐physicsPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{Ugur2019,\nauthor = {Uğur, Mesut and Keysan, Ozan},\ndoi = {10.1049/joe.2018.8258},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Uğur, Keysan - 2019 - Multi‐physics design optimisation of a GaN‐based integrated modular motor drive system.pdf:pdf},\nissn = {2051-3305},\njournal = {The Journal of Engineering},\nmonth = {jun},\nnumber = {17},\npages = {3900--3905},\ntitle = {{Multi‐physics design optimisation of a GaN‐based integrated modular motor drive system}},\nurl = {https://digital-library.theiet.org/content/journals/10.1049/joe.2018.8258 https://onlinelibrary.wiley.com/doi/10.1049/joe.2018.8258},\nvolume = {2019},\nyear = {2019}\n}\n
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\n \n\n \n \n Tarvirdilu Asl, R.; Yüksel, H. M.; and Keysan, O.\n\n\n \n \n \n \n \n Multi-objective design optimization of a permanent magnet axial flux eddy current brake.\n \n \n \n \n\n\n \n\n\n\n Turkish Journal of Electrical Engineering & Computer Sciences, 27(2): 998–1011. mar 2019.\n \n\n\n\n
\n\n\n\n \n \n \"Multi-objectivePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{TARVIRDILUASL2019,\nabstract = {The main aim of this study is to optimize an axial flux eddy current damper to be used in a specific aviation application. Eddy current dampers are more advantageous compared to conventional mechanical dampers as they are maintenance-free due to contactless structure and have higher reliability, which is very desirable in aerospace applications. An initial eddy current brake prototype is manufactured and the test results are used to verify the 3-D finite element simulations. The effect of temperature on the brake performance is investigated. Finally, a multiobjective genetic algorithm optimization is applied to find the optimum pole number and geometric dimensions of the eddy current brake in order to achieve the desired torque-speed characteristic while the total weight of the brake is minimized. It is found that the mass and volume of the initial prototype can be halved by implementing this optimization algorithm.},\nauthor = {{Tarvirdilu Asl}, Rasul and Y{\\"{u}}ksel, H{\\"{u}}seyim Murat and Keysan, Ozan},\ndoi = {10.3906/elk-1802-65},\nfile = {::},\nissn = {1303-6203},\njournal = {Turkish Journal of Electrical Engineering & Computer Sciences},\nkeywords = {Axial flux,Eddy current brake,Finite element,Multiobjective design optimization,Permanent magnet,Weight minimization},\nmonth = {mar},\nnumber = {2},\npages = {998--1011},\ntitle = {{Multi-objective design optimization of a permanent magnet axial flux eddy current brake}},\nurl = {http://online.journals.tubitak.gov.tr/openDoiPdf.htm?mKodu=elk-1802-65},\nvolume = {27},\nyear = {2019}\n}\n
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\n The main aim of this study is to optimize an axial flux eddy current damper to be used in a specific aviation application. Eddy current dampers are more advantageous compared to conventional mechanical dampers as they are maintenance-free due to contactless structure and have higher reliability, which is very desirable in aerospace applications. An initial eddy current brake prototype is manufactured and the test results are used to verify the 3-D finite element simulations. The effect of temperature on the brake performance is investigated. Finally, a multiobjective genetic algorithm optimization is applied to find the optimum pole number and geometric dimensions of the eddy current brake in order to achieve the desired torque-speed characteristic while the total weight of the brake is minimized. It is found that the mass and volume of the initial prototype can be halved by implementing this optimization algorithm.\n
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\n  \n 2018\n \n \n (11)\n \n \n
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\n \n\n \n \n Ugur, M.; and Keysan, O.\n\n\n \n \n \n \n \n Tümleşik Modüler Motor Sürücü Sistemi Tasarımı.\n \n \n \n \n\n\n \n\n\n\n Fırat Üniversitesi Mühendislik Bilimleri Dergisi, 30(3): 75–83. 2018.\n \n\n\n\n
\n\n\n\n \n \n \"TümleşikPaper\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Ugur2018a,\nauthor = {Ugur, Mesut and Keysan, Ozan},\nfile = {::},\njournal = {Fırat {\\"{U}}niversitesi M{\\"{u}}hendislik Bilimleri Dergisi},\nkeywords = {dc bus capacitor bank,gallium nitride,integrated motor drives,modular motor,permanent magnet synchronous motor,power density},\nnumber = {3},\npages = {75--83},\ntitle = {{T{\\"{u}}mleşik Mod{\\"{u}}ler Motor S{\\"{u}}r{\\"{u}}c{\\"{u}} Sistemi Tasarımı}},\nurl = {https://dergipark.org.tr/fumbd/issue/39229/461963},\nvolume = {30},\nyear = {2018}\n}\n
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\n \n\n \n \n Ugur, M.; and Keysan, O.\n\n\n \n \n \n \n \n Design of a GaN Based Integrated Modular Motor Drive.\n \n \n \n \n\n\n \n\n\n\n In 2018 XIII International Conference on Electrical Machines (ICEM), pages 1471–1477, sep 2018. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"DesignPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Ugur2018c,\nauthor = {Ugur, M. and Keysan, O.},\nbooktitle = {2018 XIII International Conference on Electrical Machines (ICEM)},\ndoi = {10.1109/ICELMACH.2018.8506862},\nfile = {::},\nisbn = {978-1-5386-2477-7},\nkeywords = {Gallium nitride,Integrated motor drive,Modular motor,Permanent magnet synchronous motor,Power density},\nmonth = {sep},\nnumber = {Immd},\npages = {1471--1477},\npublisher = {IEEE},\ntitle = {{Design of a GaN Based Integrated Modular Motor Drive}},\nurl = {https://ieeexplore.ieee.org/document/8506862/},\nyear = {2018}\n}\n
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\n \n\n \n \n Mutlu, M. K.; Keysan, O.; and Ulutas, B.\n\n\n \n \n \n \n \n Limited-Jerk Sinusoidal Trajectory Design for FOC of PMSM with H -Infinity Optimal Controller.\n \n \n \n \n\n\n \n\n\n\n In 2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC), pages 704–710, aug 2018. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"Limited-JerkPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@inproceedings{Mutlu2018,\nauthor = {Mutlu, Mehmet Kaan and Keysan, Ozan and Ulutas, Baris},\nbooktitle = {2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)},\ndoi = {10.1109/EPEPEMC.2018.8521749},\nfile = {::},\nisbn = {978-1-5386-4198-9},\nmonth = {aug},\npages = {704--710},\npublisher = {IEEE},\ntitle = {{Limited-Jerk Sinusoidal Trajectory Design for FOC of PMSM with H -Infinity Optimal Controller}},\nurl = {https://ieeexplore.ieee.org/document/8521749/},\nyear = {2018}\n}\n
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\n \n\n \n \n Duymaz, E.; Pourkeivannour, S.; Ceylan, D.; Sahin, I.; and Keysan, O.\n\n\n \n \n \n \n \n Design of a Power Plant Emulator for the Dynamic Frequency Stability Studies.\n \n \n \n \n\n\n \n\n\n\n In 2018 XIII International Conference on Electrical Machines (ICEM), pages 152–157, sep 2018. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"DesignPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Duymaz2018,\nabstract = {{\\textcopyright} 2018 IEEE. Increasing renewable energy integration to grid requires inertial support to improve frequency stability of the power system. Inertial support of renewable energy systems requires hardware verification in order to test practical limitations and absence of dynamical grid simulators makes verification studies more challenging. In this study, a test rig which is composed of a DC motor, an AC synchronous generator and an external flywheel, is developed in order to provide a platform in which dynamic properties of an actual power plant can be simulated in the laboratory conditions. A 4 kVA power plant simulator with a field exciter and a speed governor is developed with 1kVA buck converters. The frequency response of the test bench is controlled in parallel with the computer simulations in Digsilent Powerfactory environment. The developed test rig is a low cost and simple solution aimed for experimental studies regarding inertial support of renewable energy systems or power system frequency studies.},\nauthor = {Duymaz, Erencan and Pourkeivannour, Siamak and Ceylan, Doga and Sahin, Iilker and Keysan, Ozan},\nbooktitle = {2018 XIII International Conference on Electrical Machines (ICEM)},\ndoi = {10.1109/ICELMACH.2018.8507035},\nfile = {::},\nisbn = {978-1-5386-2477-7},\nkeywords = {Frequency Stability,Grid Simulator,Power Generation Control,Power System Dynamics,Power System Stability},\nmonth = {sep},\npages = {152--157},\npublisher = {IEEE},\ntitle = {{Design of a Power Plant Emulator for the Dynamic Frequency Stability Studies}},\nurl = {https://ieeexplore.ieee.org/document/8507035/},\nyear = {2018}\n}\n
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\n © 2018 IEEE. Increasing renewable energy integration to grid requires inertial support to improve frequency stability of the power system. Inertial support of renewable energy systems requires hardware verification in order to test practical limitations and absence of dynamical grid simulators makes verification studies more challenging. In this study, a test rig which is composed of a DC motor, an AC synchronous generator and an external flywheel, is developed in order to provide a platform in which dynamic properties of an actual power plant can be simulated in the laboratory conditions. A 4 kVA power plant simulator with a field exciter and a speed governor is developed with 1kVA buck converters. The frequency response of the test bench is controlled in parallel with the computer simulations in Digsilent Powerfactory environment. The developed test rig is a low cost and simple solution aimed for experimental studies regarding inertial support of renewable energy systems or power system frequency studies.\n
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\n \n\n \n \n Karakaya, F.; Ugur, M.; and Keysan, O.\n\n\n \n \n \n \n \n Investigation of Turn-on and Turn-off Characteristics of Enhancement-Mode GaN Power Transistors.\n \n \n \n \n\n\n \n\n\n\n 2018 20th European Conference on Power Electronics and Applications, EPE 2018 ECCE Europe,P.1–P.9. 2018.\n \n\n\n\n
\n\n\n\n \n \n \"InvestigationPaper\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Karakaya2018b,\nabstract = {{\\textcopyright} 2018 EPE Association. In this paper, turn-on and turn-off switching behavior of 650V enhancement-mode GaN power FETs are investigated. An analytical model is developed to analyze the current-voltage characteristics of the device during switching transients both with and without the effects of parasitic components. In addition, the effect of the temperature and circuit parameters on the switching characteristics are investigated.},\nauthor = {Karakaya, Furkan and Ugur, Mesut and Keysan, Ozan},\nfile = {::},\nisbn = {9789075815283},\njournal = {2018 20th European Conference on Power Electronics and Applications, EPE 2018 ECCE Europe},\nkeywords = {Device characterisation,Device modeling,Device simulation,Gallium Nitride (GaN),Wide bandgap devices},\npages = {P.1--P.9},\npublisher = {EPE Association},\ntitle = {{Investigation of Turn-on and Turn-off Characteristics of Enhancement-Mode GaN Power Transistors}},\nurl = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8515323&isnumber=8515301},\nyear = {2018}\n}\n
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\n © 2018 EPE Association. In this paper, turn-on and turn-off switching behavior of 650V enhancement-mode GaN power FETs are investigated. An analytical model is developed to analyze the current-voltage characteristics of the device during switching transients both with and without the effects of parasitic components. In addition, the effect of the temperature and circuit parameters on the switching characteristics are investigated.\n
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\n \n\n \n \n Akgemci, A.; Zeinali, R.; and Keysan, O.\n\n\n \n \n \n \n \n Minimization of EMF Harmonics and Cogging Torque for a Medium Speed RFPM Wind Turbine Generator.\n \n \n \n \n\n\n \n\n\n\n In 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA), volume 5, pages 342–347, Paris, oct 2018. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"MinimizationPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@inproceedings{Akgemci,\naddress = {Paris},\nauthor = {Akgemci, Aysel and Zeinali, Reza and Keysan, Ozan},\nbooktitle = {2018 7th International Conference on Renewable Energy Research and Applications (ICRERA)},\ndoi = {10.1109/ICRERA.2018.8566734},\nfile = {::},\nisbn = {978-1-5386-5982-3},\nmonth = {oct},\npages = {342--347},\npublisher = {IEEE},\ntitle = {{Minimization of EMF Harmonics and Cogging Torque for a Medium Speed RFPM Wind Turbine Generator}},\nurl = {https://ieeexplore.ieee.org/document/8566734/},\nvolume = {5},\nyear = {2018}\n}\n
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\n \n\n \n \n Ceylan, D.; Gudelek, M. U.; and Keysan, O.\n\n\n \n \n \n \n \n Armature Shape Optimization of an Electromagnetic Launcher Including Contact Resistance.\n \n \n \n \n\n\n \n\n\n\n IEEE Transactions on Plasma Science, 46(10): 3619–3627. oct 2018.\n \n\n\n\n
\n\n\n\n \n \n \"ArmaturePaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@article{Ceylan2018,\nauthor = {Ceylan, Doga and Gudelek, Mehmet Ugur and Keysan, Ozan},\ndoi = {10.1109/TPS.2018.2845948},\nfile = {::},\nissn = {0093-3813},\njournal = {IEEE Transactions on Plasma Science},\nmonth = {oct},\nnumber = {10},\npages = {3619--3627},\ntitle = {{Armature Shape Optimization of an Electromagnetic Launcher Including Contact Resistance}},\nurl = {https://ieeexplore.ieee.org/document/8393457/},\nvolume = {46},\nyear = {2018}\n}\n
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\n \n\n \n \n Sahin, I.; and Keysan, O.\n\n\n \n \n \n \n \n A new model predictive torque control strategy with reduced set of prediction vectors.\n \n \n \n \n\n\n \n\n\n\n In 2018 IEEE 12th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG 2018), pages 1–6, apr 2018. IEEE\n \n\n\n\n
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@inproceedings{Sahin2018,\nauthor = {Sahin, Ilker and Keysan, Ozan},\nbooktitle = {2018 IEEE 12th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG 2018)},\ndoi = {10.1109/CPE.2018.8372531},\nfile = {::},\nisbn = {978-1-5386-2508-8},\nkeywords = {computational cost,finite control set,inverter,model predictive control,motor drive,predictive torque control,reduced set,voltage source},\nmonth = {apr},\npages = {1--6},\npublisher = {IEEE},\ntitle = {{A new model predictive torque control strategy with reduced set of prediction vectors}},\nurl = {https://ieeexplore.ieee.org/document/8372531/},\nyear = {2018}\n}\n
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\n \n\n \n \n Ugur, M.; Sarac, H.; and Keysan, O.\n\n\n \n \n \n \n Comparison of Inverter Topologies Suited for Integrated Modular Motor Drive Applications.\n \n \n \n\n\n \n\n\n\n In 2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC), pages 524–530, 2018. IEEE\n \n\n\n\n
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@inproceedings{Ugur2018,\nauthor = {Ugur, Mesut and Sarac, Hakan and Keysan, Ozan},\nbooktitle = {2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC)},\ndoi = {10.1109/EPEPEMC.2018.8521918},\nfile = {::},\nisbn = {9781538641989},\nkeywords = {gallium,integrated motor drive,modular motor drive topologies,motor drive efficiency,voltage source inverter},\npages = {524--530},\npublisher = {IEEE},\ntitle = {{Comparison of Inverter Topologies Suited for Integrated Modular Motor Drive Applications}},\nyear = {2018}\n}\n
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\n \n\n \n \n Ugur, M.; Duymaz, E.; Gol, M.; and Keysan, O.\n\n\n \n \n \n \n \n Evaluation of Photovoltaic Systems for Reactive Power Compensation in Low Voltage Power Systems.\n \n \n \n \n\n\n \n\n\n\n In 2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe), pages 1–6, oct 2018. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"EvaluationPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Ugur2018b,\nauthor = {Ugur, Mesut and Duymaz, Erencan and Gol, Murat and Keysan, Ozan},\nbooktitle = {2018 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe)},\ndoi = {10.1109/ISGTEurope.2018.8571808},\nfile = {::},\nisbn = {978-1-5386-4505-5},\nkeywords = {PV inverters,Solar power generation,reactive demand charge,reactive power compensation},\nmonth = {oct},\npages = {1--6},\npublisher = {IEEE},\ntitle = {{Evaluation of Photovoltaic Systems for Reactive Power Compensation in Low Voltage Power Systems}},\nurl = {https://ieeexplore.ieee.org/document/8571808/},\nyear = {2018}\n}\n
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\n \n\n \n \n Cakal, G.; Zeinali, R.; and Keysan, O.\n\n\n \n \n \n \n \n Design and Optimization of Reduced Torque Ripple Rotary Voice Coil Motor.\n \n \n \n \n\n\n \n\n\n\n In 2018 XIII International Conference on Electrical Machines (ICEM), pages 663–669, sep 2018. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"DesignPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Cakal2018a,\nabstract = {{\\textcopyright} 2018 IEEE. Voice coil motors (VCMs) are becoming more popular due to their small size and high dynamic performance. They are commonly used in hard disk drives and vibration isolators in optical systems. Torque ripple is an important performance index for rotary VCM. In order to reduce torque ripple and make their dynamic performance better, various parameters of two different rotary VCM topologies are studied with finite element analysis. The effects of magnet separation angle, coil separation angle and coil type on torque characteristics are analyzed. In order to achieve better dynamic performance and higher precision, optimization study is conducted to find optimum design, which has only 3.3% torque ripple throughout its whole operation range.},\nauthor = {Cakal, Gokhan and Zeinali, Reza and Keysan, Ozan},\nbooktitle = {2018 XIII International Conference on Electrical Machines (ICEM)},\ndoi = {10.1109/ICELMACH.2018.8506976},\nfile = {::},\nisbn = {978-1-5386-2477-7},\nkeywords = {Design optimization,Finite element analysis,Rotary voice coil motor (VCM),Torque characteristics,Torque ripple},\nmonth = {sep},\npages = {663--669},\npublisher = {IEEE},\ntitle = {{Design and Optimization of Reduced Torque Ripple Rotary Voice Coil Motor}},\nurl = {https://ieeexplore.ieee.org/document/8506976/},\nyear = {2018}\n}\n
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\n © 2018 IEEE. Voice coil motors (VCMs) are becoming more popular due to their small size and high dynamic performance. They are commonly used in hard disk drives and vibration isolators in optical systems. Torque ripple is an important performance index for rotary VCM. In order to reduce torque ripple and make their dynamic performance better, various parameters of two different rotary VCM topologies are studied with finite element analysis. The effects of magnet separation angle, coil separation angle and coil type on torque characteristics are analyzed. In order to achieve better dynamic performance and higher precision, optimization study is conducted to find optimum design, which has only 3.3% torque ripple throughout its whole operation range.\n
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\n \n\n \n \n Uğur, M.; and Keysan, O.\n\n\n \n \n \n \n \n Tümleşik Modüler Motor Sürücü Sistemi Tasarımı.\n \n \n \n \n\n\n \n\n\n\n In Ulusal Elektrik Enerjisi Dönüşümü Kongresi, pages 2–8, Elazig, 2017. \n \n\n\n\n
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@inproceedings{Ugur2017a,\naddress = {Elazig},\nauthor = {Uğur, Mesut and Keysan, Ozan},\nbooktitle = {Ulusal Elektrik Enerjisi D{\\"{o}}n{\\"{u}}ş{\\"{u}}m{\\"{u}} Kongresi},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Uğur, Keysan - 2017 - T{\\"{u}}mleşik Mod{\\"{u}}ler Motor S{\\"{u}}r{\\"{u}}c{\\"{u}} Sistemi Tasarımı.pdf:pdf},\npages = {2--8},\ntitle = {{T{\\"{u}}mleşik Mod{\\"{u}}ler Motor S{\\"{u}}r{\\"{u}}c{\\"{u}} Sistemi Tasarımı}},\nurl = {http://www.enerjidonusumu.org},\nyear = {2017}\n}\n
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\n \n\n \n \n Ceylan, D; and Keysan, O\n\n\n \n \n \n \n \n Armature shape optimization of an electromagnetic launcher using genetic algorithm.\n \n \n \n \n\n\n \n\n\n\n In IEEE Pulsed Power Conference, Birmingham, 2017. \n \n\n\n\n
\n\n\n\n \n \n \"ArmaturePaper\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@inproceedings{Ceylan2017j,\naddress = {Birmingham},\nauthor = {Ceylan, D and Keysan, O},\nbooktitle = {IEEE Pulsed Power Conference},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Ceylan, Keysan - 2017 - Armature shape optimization of an electromagnetic launcher using genetic algorithm.pdf:pdf},\ntitle = {{Armature shape optimization of an electromagnetic launcher using genetic algorithm}},\nurl = {https://indico.cern.ch/event/572801/},\nyear = {2017}\n}\n
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\n \n\n \n \n Ugur, M.; and Keysan, O.\n\n\n \n \n \n \n \n DC link capacitor optimization for integrated modular motor drives.\n \n \n \n \n\n\n \n\n\n\n In 2017 IEEE 26th International Symposium on Industrial Electronics (ISIE), volume i, pages 263–270, Edinburgh, jun 2017. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"DCPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Ugur2017,\naddress = {Edinburgh},\nauthor = {Ugur, Mesut and Keysan, Ozan},\nbooktitle = {2017 IEEE 26th International Symposium on Industrial Electronics (ISIE)},\ndoi = {10.1109/ISIE.2017.8001258},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Ugur, Keysan - 2017 - DC link capacitor optimization for integrated modular motor drives.pdf:pdf},\nisbn = {978-1-5090-1412-5},\nkeywords = {dc link capacitor,gan,integrated modular motor drive,interleaving,machine,split winding},\nmonth = {jun},\npages = {263--270},\npublisher = {IEEE},\ntitle = {{DC link capacitor optimization for integrated modular motor drives}},\nurl = {http://ieeexplore.ieee.org/document/8001258/},\nvolume = {i},\nyear = {2017}\n}\n
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\n \n\n \n \n Ceylan, D.; and Keysan, O.\n\n\n \n \n \n \n \n Effect of conducting containment on electromagnetic launcher efficiency.\n \n \n \n \n\n\n \n\n\n\n In 2017 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering (ISEF) Book of Abstracts, pages 1–2, Poland, sep 2017. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"EffectPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Ceylan2017b,\naddress = {Poland},\nauthor = {Ceylan, Doga and Keysan, Ozan},\nbooktitle = {2017 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering (ISEF) Book of Abstracts},\ndoi = {10.1109/ISEF.2017.8090733},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Ceylan, Keysan - 2017 - Effect of conducting containment on electromagnetic launcher efficiency.pdf:pdf},\nisbn = {978-1-5386-1661-1},\nkeywords = {a critical,although using metal containment,close to rails is,containment,efficiency,existence of the containment,in terms of mechanical,issue for electromagnetic launchers,lamination,negatively affects,railgun,requirements},\nmonth = {sep},\npages = {1--2},\npublisher = {IEEE},\ntitle = {{Effect of conducting containment on electromagnetic launcher efficiency}},\nurl = {https://isef2017.jordan.pl/upload/Lodz/program/plan_20170816b.pdf http://ieeexplore.ieee.org/document/8090733/},\nyear = {2017}\n}\n
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\n \n\n \n \n Zeinali, R.; and Keysan, O.\n\n\n \n \n \n \n \n A Novel Magnetic Geared Superconducting Generator Design for Direct-Drive Wind Turbines.\n \n \n \n \n\n\n \n\n\n\n In 10th Japaneese-Mediteranean Workshop on Applied Electromagnetic Engineering for Magnetic, Superconducting and Nano Materials, pages 16–18, Izmir, 2017. \n \n\n\n\n
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@inproceedings{Zeinali2017,\naddress = {Izmir},\nauthor = {Zeinali, Reza and Keysan, Ozan},\nbooktitle = {10th Japaneese-Mediteranean Workshop on Applied Electromagnetic Engineering for Magnetic, Superconducting and Nano Materials},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Zeinali, Keysan - 2017 - A Novel Magnetic Geared Superconducting Generator Design for Direct-Drive Wind Turbines.pdf:pdf},\npages = {16--18},\ntitle = {{A Novel Magnetic Geared Superconducting Generator Design for Direct-Drive Wind Turbines}},\nurl = {http://japmed10.iyte.edu.tr/},\nyear = {2017}\n}\n
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\n \n\n \n \n Ceylan, D.; Gudelek, M. U.; and Keysan, O.\n\n\n \n \n \n \n \n Armature shape optimization of an electromagnetic launcher using genetic algorithm.\n \n \n \n \n\n\n \n\n\n\n In 2017 IEEE 21st International Conference on Pulsed Power (PPC), volume 2017-June, pages 1–6, jun 2017. IEEE\n \n\n\n\n
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@inproceedings{Ceylan2017i,\nabstract = {{\\textcopyright} 2017 IEEE. Barrel side and pulsed power supply module are two crucial parts of an electromagnetic launcher (EML), which affects the efficiency. One of the most important features in the barrel side is the shape of the armature. In this study, the shape of the armature is optimized by using independent variables to define the exact geometry of the armature. The main goal is to maximize the muzzle kinetic energy of the projectile. Armature geometry is divided into pieces which are used in the optimization algorithm as independent variables. Finite element method (FEM) is used to calculate the fitness function of the genetic algorithm (GA).},\nauthor = {Ceylan, D. and Gudelek, M. U. and Keysan, O.},\nbooktitle = {2017 IEEE 21st International Conference on Pulsed Power (PPC)},\ndoi = {10.1109/PPC.2017.8291202},\nfile = {::},\nisbn = {978-1-5090-5748-1},\nissn = {21584923},\nmonth = {jun},\npages = {1--6},\npublisher = {IEEE},\ntitle = {{Armature shape optimization of an electromagnetic launcher using genetic algorithm}},\nurl = {http://ieeexplore.ieee.org/document/8291202/},\nvolume = {2017-June},\nyear = {2017}\n}\n
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\n © 2017 IEEE. Barrel side and pulsed power supply module are two crucial parts of an electromagnetic launcher (EML), which affects the efficiency. One of the most important features in the barrel side is the shape of the armature. In this study, the shape of the armature is optimized by using independent variables to define the exact geometry of the armature. The main goal is to maximize the muzzle kinetic energy of the projectile. Armature geometry is divided into pieces which are used in the optimization algorithm as independent variables. Finite element method (FEM) is used to calculate the fitness function of the genetic algorithm (GA).\n
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\n \n\n \n \n Radyjowski, P.; Keysan, O.; Burchell, J.; and Mueller, M.\n\n\n \n \n \n \n \n Development of a superconducting claw-pole linear test-rig.\n \n \n \n \n\n\n \n\n\n\n Superconductor Science and Technology, 29(4): 044002. apr 2016.\n \n\n\n\n
\n\n\n\n \n \n \"DevelopmentPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Radyjowski2016b,\nabstract = {Superconducting generators can help to reduce the cost of energy for large offshore wind turbines, where the size and mass of the generator have a direct effect on the installation cost. However, existing superconducting generators are not as reliable as the alternative technologies. In this paper, a linear test prototype for a novel superconducting claw-pole topology, which has a stationary superconducting coil that eliminates the cryocooler coupler will be presented. The issues related to mechanical, electromagnetic and thermal aspects of the prototype will be presented},\nauthor = {Radyjowski, Patryk and Keysan, Ozan and Burchell, Joseph and Mueller, Markus},\ndoi = {10.1088/0953-2048/29/4/044002},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Radyjowski et al. - 2016 - Development of a superconducting claw-pole linear test-rig.pdf:pdf},\nissn = {0953-2048},\njournal = {Superconductor Science and Technology},\nkeywords = {appear in colour only,in the online journal,linear,offshore wind turbines,renewable energy,some fi gures may,superconducting machines},\nmonth = {apr},\nnumber = {4},\npages = {044002},\ntitle = {{Development of a superconducting claw-pole linear test-rig}},\nurl = {http://stacks.iop.org/0953-2048/29/i=4/a=044002?key=crossref.0608b605ef9f016258d554db505d282f},\nvolume = {29},\nyear = {2016}\n}\n
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\n Superconducting generators can help to reduce the cost of energy for large offshore wind turbines, where the size and mass of the generator have a direct effect on the installation cost. However, existing superconducting generators are not as reliable as the alternative technologies. In this paper, a linear test prototype for a novel superconducting claw-pole topology, which has a stationary superconducting coil that eliminates the cryocooler coupler will be presented. The issues related to mechanical, electromagnetic and thermal aspects of the prototype will be presented\n
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\n \n\n \n \n Erdogan, M.; Keysan, O.; and Inanir, F.\n\n\n \n \n \n \n \n Finite element analysis of simultaneous electromagnetic and heat transfer equations in HTS coil.\n \n \n \n \n\n\n \n\n\n\n In International Conference on Energy Systems, pages 21–23, Istanbul, 2016. \n \n\n\n\n
\n\n\n\n \n \n \"FinitePaper\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Erdogan2016,\naddress = {Istanbul},\nauthor = {Erdogan, Muzaffer and Keysan, Ozan and Inanir, Fedai},\nbooktitle = {International Conference on Energy Systems},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Erdogan, Keysan, Inanir - 2016 - Finite element analysis of simultaneous electromagnetic and heat transfer equations in HTS coil.pdf:pdf},\nkeywords = {250 2614,250 9925,90 282,ac losses,av formulation,corresponding author,e-mail address,edu,fax,finite-element method,h formulation of maxwell,merdogan,most preferred simulation tools,nku,phone,s,superconducting coil,tr},\nnumber = {December},\npages = {21--23},\ntitle = {{Finite element analysis of simultaneous electromagnetic and heat transfer equations in HTS coil}},\nurl = {http://www.ices2016conference.com/},\nyear = {2016}\n}\n
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\n \n\n \n \n Erdogan, M.; Cicek, A.; Yildiz, S.; Evran, A.; Keysan, O.; and Inanir, F.\n\n\n \n \n \n \n \n Optimizing the efficiency in AC energy transfer via a stack of four coils made of 2G HTS tapes.\n \n \n \n \n\n\n \n\n\n\n In International Conference on Energy Systems, pages 21–23, Istanbul, 2016. \n \n\n\n\n
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@inproceedings{Erdogan2016a,\naddress = {Istanbul},\nauthor = {Erdogan, Muzaffer and Cicek, Ahmet and Yildiz, Sukru and Evran, Ahi and Keysan, Ozan and Inanir, Fedai},\nbooktitle = {International Conference on Energy Systems},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Erdogan et al. - 2016 - Optimizing the efficiency in AC energy transfer via a stack of four coils made of 2G HTS tapes.pdf:pdf},\nkeywords = {ac losses,av formulation,besides its production,efficiency,energy transfer with high,finite-element method,introduction,mandatory header,superconducting coil},\nnumber = {December},\npages = {21--23},\ntitle = {{Optimizing the efficiency in AC energy transfer via a stack of four coils made of 2G HTS tapes}},\nurl = {http://www.ices2016conference.com},\nyear = {2016}\n}\n
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\n \n\n \n \n Alemdar, O.; and Keysan, O\n\n\n \n \n \n \n \n Design and implementation of an unregulated DC-DC transformer (DCX) module using LLC resonant converter.\n \n \n \n \n\n\n \n\n\n\n In 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016), pages 6 .–6 ., 2016. Institution of Engineering and Technology\n \n\n\n\n
\n\n\n\n \n \n \"DesignPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Alemdar2016,\nabstract = {Traditional high-power centralized front-end DC/DC converter can be replaced with an array of paralleled standardized DC/DC transformer (DCX) modules when load current sharing is accomplished between individual modules. In this study, an LLC resonant converter is proposed as an unregulated DCX module, which has current sharing capability. Current sharing feature is implemented by using the droop current sharing method. A methodical design process is presented for the selection of the resonant tank components. A 500kHz, 100W LLC DCX module having 360-410V input and 12.5-12.1V output is designed and tested. Current sharing performance of the proposed module is demonstrated using a two-module array 200W front-end DC/DC converter.},\nauthor = {Alemdar, OS and Keysan, O},\nbooktitle = {8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)},\ndoi = {10.1049/cp.2016.0156},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Alemdar, Keysan - 2016 - Design and implementation of an unregulated DC-DC transformer (DCX) module using LLC resonant converter.pdf:pdf},\nisbn = {978-1-78561-188-9},\nkeywords = {current sharing,dc-dc transformer,llc resonant converter,modular power converter},\nnumber = {Dcx},\npages = {6 .--6 .},\npublisher = {Institution of Engineering and Technology},\ntitle = {{Design and implementation of an unregulated DC-DC transformer (DCX) module using LLC resonant converter}},\nurl = {http://digital-library.theiet.org/content/conferences/10.1049/cp.2016.0156 https://digital-library.theiet.org/content/conferences/10.1049/cp.2016.0156},\nyear = {2016}\n}\n
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\n Traditional high-power centralized front-end DC/DC converter can be replaced with an array of paralleled standardized DC/DC transformer (DCX) modules when load current sharing is accomplished between individual modules. In this study, an LLC resonant converter is proposed as an unregulated DCX module, which has current sharing capability. Current sharing feature is implemented by using the droop current sharing method. A methodical design process is presented for the selection of the resonant tank components. A 500kHz, 100W LLC DCX module having 360-410V input and 12.5-12.1V output is designed and tested. Current sharing performance of the proposed module is demonstrated using a two-module array 200W front-end DC/DC converter.\n
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\n \n\n \n \n Radyjowski, P.; Keysan, O.; Burchell, J.; and Mueller, M.\n\n\n \n \n \n \n \n Development of a superconducting claw-pole linear test-rig.\n \n \n \n \n\n\n \n\n\n\n Superconductor Science and Technology, 29(4): 044002. apr 2016.\n \n\n\n\n
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@article{Radyjowski2016a,\nauthor = {Radyjowski, Patryk and Keysan, Ozan and Burchell, Joseph and Mueller, Markus},\ndoi = {10.1088/0953-2048/29/4/044002},\nfile = {::},\nissn = {0953-2048},\njournal = {Superconductor Science and Technology},\nmonth = {apr},\nnumber = {4},\npages = {044002},\npublisher = {IOP Publishing},\ntitle = {{Development of a superconducting claw-pole linear test-rig}},\nurl = {http://stacks.iop.org/0953-2048/29/i=4/a=044002?key=crossref.0608b605ef9f016258d554db505d282f},\nvolume = {29},\nyear = {2016}\n}\n
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\n \n\n \n \n Mueller, M.; Keysan, O; and Bernholz, J.\n\n\n \n \n \n \n \n Analytical model for superconducting generators for wave energy systems.\n \n \n \n \n\n\n \n\n\n\n In 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016), pages 6 .–6 ., 2016. Institution of Engineering and Technology\n \n\n\n\n
\n\n\n\n \n \n \"AnalyticalPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@inproceedings{Bernholz2016,\nauthor = {Mueller, M.A. and Keysan, O and Bernholz, J.J.},\nbooktitle = {8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)},\ndoi = {10.1049/cp.2016.0192},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Mueller, Keysan, Bernholz - 2016 - Analytical model for superconducting generators for wave energy systems.pdf:pdf},\nisbn = {978-1-78561-188-9},\npages = {6 .--6 .},\npublisher = {Institution of Engineering and Technology},\ntitle = {{Analytical model for superconducting generators for wave energy systems}},\nurl = {http://digital-library.theiet.org/content/conferences/10.1049/cp.2016.0192 https://digital-library.theiet.org/content/conferences/10.1049/cp.2016.0192},\nyear = {2016}\n}\n
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\n  \n 2015\n \n \n (5)\n \n \n
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\n \n\n \n \n Macadré, L.; Mcauliffe, F. D.; Keysan, O.; Donovan, M. H.; Armstrong, S.; Murphy, J.; and Lynch, K.\n\n\n \n \n \n \n Optimal Power Aggregation Methods for Marine Renewable Energy Converters ; a Combined Economic and Reliability Approach.\n \n \n \n\n\n \n\n\n\n In EWTEC - European Wave and Tidal Energy Conference, Nantes, France, 2015. \n \n\n\n\n
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@inproceedings{Macadre2015,\naddress = {Nantes, France},\nauthor = {Macadr{\\'{e}}, Laura-mae and Mcauliffe, Fiona Devoy and Keysan, Ozan and Donovan, Martin Heyman and Armstrong, Sara and Murphy, Jimmy and Lynch, Katie},\nbooktitle = {EWTEC - European Wave and Tidal Energy Conference},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Macadr{\\'{e}} et al. - 2015 - Optimal Power Aggregation Methods for Marine Renewable Energy Converters a Combined Economic and Reliability A.pdf:pdf},\nkeywords = {combined platforms,marine renewable energy,power aggregation,project finance,reliability},\ntitle = {{Optimal Power Aggregation Methods for Marine Renewable Energy Converters ; a Combined Economic and Reliability Approach}},\nyear = {2015}\n}\n
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\n \n\n \n \n İnanır, F; Kutukcu, P; and Keysan, O\n\n\n \n \n \n \n Designing and Optimizing of High Field MRI Magnets Composed of 4 Layer Superconducting Coils Made of MgB2 Wires.\n \n \n \n\n\n \n\n\n\n In European Conference on Applied Superconductivity, pages 2015, 2015. \n \n\n\n\n
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@inproceedings{Inanr2015,\nabstract = {Achieving considerably homogenous magnetic field inside a given volume so called diameter of sphere volume (DSV) between magnetic resonance magnet coils is particularly important for the full body imagination to be scanned. Therefore, the design and the optimization of the magnet geometry has to be implemented accurately by employing the numerical calculation method. In this work, we have tried to design a MRI magnet coil to be able to generated 0.5 T magnetic field and to optimize with respect to the minimum volume of coils configuration. The finite element method have been utilized for the design and as well the linear programing method for the optimization. The optimized coil configuration parameters and the magnetic field distributions have been introduced},\nauthor = {İnanır, F and Kutukcu, P and Keysan, O},\nbooktitle = {European Conference on Applied Superconductivity},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/İnanır, Kutukcu, Keysan - 2015 - Designing and Optimizing of High Field MRI Magnets Composed of 4 Layer Superconducting Coils Made of.pdf:pdf},\nnumber = {2A-LS-P-01},\npages = {2015},\ntitle = {{Designing and Optimizing of High Field MRI Magnets Composed of 4 Layer Superconducting Coils Made of MgB2 Wires}},\nyear = {2015}\n}\n
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\n Achieving considerably homogenous magnetic field inside a given volume so called diameter of sphere volume (DSV) between magnetic resonance magnet coils is particularly important for the full body imagination to be scanned. Therefore, the design and the optimization of the magnet geometry has to be implemented accurately by employing the numerical calculation method. In this work, we have tried to design a MRI magnet coil to be able to generated 0.5 T magnetic field and to optimize with respect to the minimum volume of coils configuration. The finite element method have been utilized for the design and as well the linear programing method for the optimization. The optimized coil configuration parameters and the magnetic field distributions have been introduced\n
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\n \n\n \n \n Mcdonald, A.; and Keysan, O.\n\n\n \n \n \n \n How electrical machine and drivetrain design can influence Offshore Wind Cost of Energy?.\n \n \n \n\n\n \n\n\n\n In UK Magnetics Society Electromagnetics in Renewable Energy Generation, pages 6–9, 2015. \n \n\n\n\n
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@inproceedings{Mcdonald2015,\nauthor = {Mcdonald, Alasdair and Keysan, Ozan},\nbooktitle = {UK Magnetics Society Electromagnetics in Renewable Energy Generation},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Mcdonald, Keysan - 2015 - How electrical machine and drivetrain design can influence Offshore Wind Cost of Energy.pdf:pdf},\npages = {6--9},\ntitle = {{How electrical machine and drivetrain design can influence Offshore Wind Cost of Energy?}},\nyear = {2015}\n}\n
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\n \n\n \n \n Keysan, O.\n\n\n \n \n \n \n \n Future Electrical Generator Technologies for Offshore Wind Turbines.\n \n \n \n \n\n\n \n\n\n\n Engineering & Technology Reference, (December 2014): 1–20. jan 2015.\n \n\n\n\n
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@article{Keysan2014f,\nauthor = {Keysan, Ozan},\ndoi = {10.1049/etr.2014.0020},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan - 2015 - Future Electrical Generator Technologies for Offshore Wind Turbines.pdf:pdf},\nissn = {2056-4007},\njournal = {Engineering & Technology Reference},\nkeywords = {direct-drive systems,electrical generators,generators,hydraulic power take-off,permanent-magnet,superconducting generators},\nmonth = {jan},\nnumber = {December 2014},\npages = {1--20},\ntitle = {{Future Electrical Generator Technologies for Offshore Wind Turbines}},\nurl = {http://digital-library.theiet.org/content/reference/10.1049/etr.2014.0020},\nyear = {2015}\n}\n
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\n \n\n \n \n Keysan, O.; and Mueller, M.\n\n\n \n \n \n \n \n A modular and cost-effective superconducting generator design for offshore wind turbines.\n \n \n \n \n\n\n \n\n\n\n Superconductor Science and Technology, 28(3): 034004. mar 2015.\n \n\n\n\n
\n\n\n\n \n \n \"APaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Keysan2014e,\nabstract = {Superconducting generators have the potential to reduce the tower head mass for large (∼10MW) offshore wind turbines. However, a high temperature superconductor generator should be as reliable as conventional generators for successful entry into the market. Most of the proposed designs use the superconducting synchronous generator concept, which has a higher cost than conventional generators and suffers from reliability issues. In this paper, a novel claw pole type of superconducting machine is presented. The design has a stationary superconducting field winding, which simplifies the design and increases the reliability. The machine can be operated in independent modules; thus even if one of the sections fails, the rest can operate until the next planned maintenance. Another advantage of the design is the very low superconducting wire requirement; a 10MW, 10 rpm design is presented which uses 13 km of MgB2 wire at 30 K. The outer diameter of the machine is 6.63m and it weighs 184 tonnes including the structural mass. The design is thought to be a good candidate for entering the renewable energy market, with},\nauthor = {Keysan, Ozan and Mueller, Markus},\ndoi = {10.1088/0953-2048/28/3/034004},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Mueller - 2015 - A modular and cost-effective superconducting generator design for offshore wind turbines.pdf:pdf;:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Mueller - 2015 - A modular and cost-effective superconducting generator design for offshore wind turbines(2).pdf:pdf},\nissn = {0953-2048},\njournal = {Superconductor Science and Technology},\nkeywords = {appear in colour only,fi nite element analysis,finite element analysis,in the online journal,renewable energy,some fi gures may,superconducting generator},\nmonth = {mar},\nnumber = {3},\npages = {034004},\npublisher = {IOP Publishing},\ntitle = {{A modular and cost-effective superconducting generator design for offshore wind turbines}},\nurl = {http://dx.doi.org/10.1088/0953-2048/28/3/034004 http://stacks.iop.org/0953-2048/28/i=3/a=034004?key=crossref.a510f82ed4c540663937916cbb4981e1},\nvolume = {28},\nyear = {2015}\n}\n
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\n Superconducting generators have the potential to reduce the tower head mass for large (∼10MW) offshore wind turbines. However, a high temperature superconductor generator should be as reliable as conventional generators for successful entry into the market. Most of the proposed designs use the superconducting synchronous generator concept, which has a higher cost than conventional generators and suffers from reliability issues. In this paper, a novel claw pole type of superconducting machine is presented. The design has a stationary superconducting field winding, which simplifies the design and increases the reliability. The machine can be operated in independent modules; thus even if one of the sections fails, the rest can operate until the next planned maintenance. Another advantage of the design is the very low superconducting wire requirement; a 10MW, 10 rpm design is presented which uses 13 km of MgB2 wire at 30 K. The outer diameter of the machine is 6.63m and it weighs 184 tonnes including the structural mass. The design is thought to be a good candidate for entering the renewable energy market, with\n
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\n  \n 2014\n \n \n (6)\n \n \n
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\n \n\n \n \n Burchell, J.; Keysan, O.; and Mueller, M.\n\n\n \n \n \n \n Proposed structure for a HTS generator for direct drive offshore wind turbines.\n \n \n \n\n\n \n\n\n\n In European Wind Energy Association Conference and Exhibition 2014, EWEA 2014, 2014. \n \n\n\n\n
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@inproceedings{Burchell2014a,\nabstract = {The drive for larger offshore turbines with greater outputs is curtailed by the physical size of the generator and the ability to install devices in remote areas with often changeable weather conditions. High Temperature Superconducting (HTS) machines offer the technology able to replace large Direct Drive Permanent Magnet (DDPM) generators with more compact machines. However some theoretical HTS designs often neglect the practicality of the physical support structure required to tolerate the huge magnetic attraction forces produced by increased field flux. Offshore wind turbines require structurally robust machines with low operation and maintenance costs as well as lightweight, material efficient designs. This paper will investigate a generator structure for a proposed HTC electrical machinedesign.},\nauthor = {Burchell, J. and Keysan, O. and Mueller, M.},\nbooktitle = {European Wind Energy Association Conference and Exhibition 2014, EWEA 2014},\nkeywords = {Direct drive,Generator structure,HTS,Renewable energy,Wind power},\ntitle = {{Proposed structure for a HTS generator for direct drive offshore wind turbines}},\nyear = {2014}\n}\n
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\n The drive for larger offshore turbines with greater outputs is curtailed by the physical size of the generator and the ability to install devices in remote areas with often changeable weather conditions. High Temperature Superconducting (HTS) machines offer the technology able to replace large Direct Drive Permanent Magnet (DDPM) generators with more compact machines. However some theoretical HTS designs often neglect the practicality of the physical support structure required to tolerate the huge magnetic attraction forces produced by increased field flux. Offshore wind turbines require structurally robust machines with low operation and maintenance costs as well as lightweight, material efficient designs. This paper will investigate a generator structure for a proposed HTC electrical machinedesign.\n
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\n \n\n \n \n Keysan, O.; and Mueller, M. A.\n\n\n \n \n \n \n Sizing of Electrical Generators for a Floating OWC Array.\n \n \n \n\n\n \n\n\n\n In European Wind Energy Conference, pages 1–7, Barcelona, 2014. \n \n\n\n\n
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@inproceedings{Keysan2014a,\naddress = {Barcelona},\nauthor = {Keysan, Ozan and Mueller, Markus A.},\nbooktitle = {European Wind Energy Conference},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Mueller - 2014 - Sizing of Electrical Generators for a Floating OWC Array.pdf:pdf},\npages = {1--7},\ntitle = {{Sizing of Electrical Generators for a Floating OWC Array}},\nyear = {2014}\n}\n
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\n \n\n \n \n Keysan, O.; Burchell, J.; Mueller, M.; Radyjowski, P.; Burchell, J.; and Mueller, M.\n\n\n \n \n \n \n \n Towards More Reliable and Cost Effective Superconducting Generators for Wind Turbines.\n \n \n \n \n\n\n \n\n\n\n In 7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014), pages 4.2.02–4.2.02, Manchester, 2014. Institution of Engineering and Technology\n \n\n\n\n
\n\n\n\n \n \n \"TowardsPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Keysan2014,\nabstract = {For large($\\sim$10 MW) wind turbines, direct-drive superconducting generators are proposed to reduce the tower head mass, which help to reduce the installation costs. Most of the existing designs has a very similar topology: a synchronous machine with a rotating superconducting field winding. However, this topology may not be the most suitable design for harsh offshore conditions. A novel transverse flux design is presented in this paper. The design has stationary and modular superconducting field windings combined with a double armature structure is presented in this paper.},\naddress = {Manchester},\nauthor = {Keysan, O. and Burchell, J. and Mueller, M.A. and Radyjowski, P. and Burchell, J. and Mueller, M.A.},\nbooktitle = {7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014)},\ndoi = {10.1049/cp.2014.0518},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan et al. - 2014 - Towards More Reliable and Cost Effective Superconducting Generators for Wind Turbines.pdf:pdf},\nisbn = {978-1-84919-815-8},\nkeywords = {Direct drive,Offshore wind turbines,[Claw pole,bines,claw pole,direct drive,offshore wind tur-,superconducting machines},\npages = {4.2.02--4.2.02},\npublisher = {Institution of Engineering and Technology},\ntitle = {{Towards More Reliable and Cost Effective Superconducting Generators for Wind Turbines}},\nurl = {http://digital-library.theiet.org/content/conferences/10.1049/cp.2014.0518},\nyear = {2014}\n}\n
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\n For large($∼$10 MW) wind turbines, direct-drive superconducting generators are proposed to reduce the tower head mass, which help to reduce the installation costs. Most of the existing designs has a very similar topology: a synchronous machine with a rotating superconducting field winding. However, this topology may not be the most suitable design for harsh offshore conditions. A novel transverse flux design is presented in this paper. The design has stationary and modular superconducting field windings combined with a double armature structure is presented in this paper.\n
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\n \n\n \n \n Mueller, M. A.; Keysan, O.; Kumaraperumal, A.; and Galbraith, M.\n\n\n \n \n \n \n Heat Pipes in Air Cored Windings for Improved Thermal Performance.\n \n \n \n\n\n \n\n\n\n 2014.\n \n\n\n\n
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@unpublished{Mueller2013,\nauthor = {Mueller, M. A. and Keysan, O. and Kumaraperumal, A. and Galbraith, M.},\ntitle = {{Heat Pipes in Air Cored Windings for Improved Thermal Performance}},\nyear = {2014}\n}\n
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\n \n\n \n \n Burchell, J.; Keysan, O.; and Mueller, M.\n\n\n \n \n \n \n Proposed Structure for a HTS Generator for Direct Drive Offshore Wind Turbines.\n \n \n \n\n\n \n\n\n\n In EWEA 2014, pages 145–148, 2014. \n \n\n\n\n
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@inproceedings{Burchell2014,\nabstract = {The drive for larger offshore turbines with greater outputs is curtailed by the physical size of the generator and the ability to install devices in remote areas with often changeable weather conditions. High Temperature Superconducting (HTS) machines offer the technology able to replace large Direct Drive Permanent Magnet (DDPM) generators with more compact machines. However some theoretical HTS designs often neglect the practicality of the physical support structure required to tolerate the huge magnetic attraction forces produced by increased field flux. Offshore wind turbines require structurally robust machines with low operation and maintenance costs as well as lightweight, material efficient designs. This paper will investigate a generator structure for a proposed HTC electrical machine design.},\nauthor = {Burchell, Joseph and Keysan, Ozan and Mueller, Markus},\nbooktitle = {EWEA 2014},\nkeywords = {EWEA Proceedings},\npages = {145--148},\ntitle = {{Proposed Structure for a HTS Generator for Direct Drive Offshore Wind Turbines}},\nyear = {2014}\n}\n
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\n The drive for larger offshore turbines with greater outputs is curtailed by the physical size of the generator and the ability to install devices in remote areas with often changeable weather conditions. High Temperature Superconducting (HTS) machines offer the technology able to replace large Direct Drive Permanent Magnet (DDPM) generators with more compact machines. However some theoretical HTS designs often neglect the practicality of the physical support structure required to tolerate the huge magnetic attraction forces produced by increased field flux. Offshore wind turbines require structurally robust machines with low operation and maintenance costs as well as lightweight, material efficient designs. This paper will investigate a generator structure for a proposed HTC electrical machine design.\n
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\n \n\n \n \n Keysan, O.\n\n\n \n \n \n \n \n Superconducting Generators for Large Offshore Wind Turbines.\n \n \n \n \n\n\n \n\n\n\n Ph.D. Thesis, University of Edinburgh, 2014.\n \n\n\n\n
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@phdthesis{Keysan2014c,\nabstract = {This thesis describes four novel superconducting machine concepts, in the pursuit of finding a suitable design for large offshore wind turbines. The designs should be reliable, modular and light-weight. The main novelty of the topologies reside in using a single loop shaped stationary superconducting field winding, which eliminates the rotating transfer couplers and electric brushes or brushless exciters. Furthermore, the electromagnetic forces in the superconducting wire are also eliminated, which simplifies the design and manufacturing of the cryostat and the support structure. Among the four topologies presented, the claw pole type machine is the most promising one. The rotor of the machine composes of claw-poles made from laminated electrical sheets, the superconducting field winding and the armature winding are stationary. The machine is analysed using 3D FEA simulations and a small linear machine prototype is manufactured to verify the simulations. For large scale applications, a double-sided claw pole machine is proposed, which has balanced magnetic attraction forces in the rotor. The machine has a modular cryostat structure, which increases the availability of the machine. Thus, even if a fault occurs in the cryocoolers or in the armature coils, the rest of the machine can operate at partial load until the maintenance is performed. Moreover, it is much easier to replace the faulty parts, as full disassemble of the machine is not required, and a small on- site crane can be used. As a result, it offers operational advantages over the existing superconducting topologies. A 10 MW, 10 rpm generator design is presented, which has a diameter of 6.6 m and an axial length of 1.4 m. The total active mass of the generator is 58 tonnes, and the structural mass is 126 tonnes, which gives a total mass of 184 tonnes. There are four independent cryostats and two independent armature windings in the machine to improve modularity. The biggest advantage of the design is the significantly less superconducting wire usage compared to any other designs; 10 MW machine just needs 15 km of MgB2 wire at 30 K. Thus, it is believed that the proposed topology is a very cost effective and suitable candidate for a successful entry to the wind turbine market.},\nauthor = {Keysan, Ozan},\nkeywords = {direct-drive,offshore wind,stationary superconducting coil,superconducting generator},\npages = {228},\nschool = {University of Edinburgh},\ntitle = {{Superconducting Generators for Large Offshore Wind Turbines}},\ntype = {PhD Dissertation},\nurl = {http://hdl.handle.net/1842/8841},\nyear = {2014}\n}\n
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\n This thesis describes four novel superconducting machine concepts, in the pursuit of finding a suitable design for large offshore wind turbines. The designs should be reliable, modular and light-weight. The main novelty of the topologies reside in using a single loop shaped stationary superconducting field winding, which eliminates the rotating transfer couplers and electric brushes or brushless exciters. Furthermore, the electromagnetic forces in the superconducting wire are also eliminated, which simplifies the design and manufacturing of the cryostat and the support structure. Among the four topologies presented, the claw pole type machine is the most promising one. The rotor of the machine composes of claw-poles made from laminated electrical sheets, the superconducting field winding and the armature winding are stationary. The machine is analysed using 3D FEA simulations and a small linear machine prototype is manufactured to verify the simulations. For large scale applications, a double-sided claw pole machine is proposed, which has balanced magnetic attraction forces in the rotor. The machine has a modular cryostat structure, which increases the availability of the machine. Thus, even if a fault occurs in the cryocoolers or in the armature coils, the rest of the machine can operate at partial load until the maintenance is performed. Moreover, it is much easier to replace the faulty parts, as full disassemble of the machine is not required, and a small on- site crane can be used. As a result, it offers operational advantages over the existing superconducting topologies. A 10 MW, 10 rpm generator design is presented, which has a diameter of 6.6 m and an axial length of 1.4 m. The total active mass of the generator is 58 tonnes, and the structural mass is 126 tonnes, which gives a total mass of 184 tonnes. There are four independent cryostats and two independent armature windings in the machine to improve modularity. The biggest advantage of the design is the significantly less superconducting wire usage compared to any other designs; 10 MW machine just needs 15 km of MgB2 wire at 30 K. Thus, it is believed that the proposed topology is a very cost effective and suitable candidate for a successful entry to the wind turbine market.\n
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\n  \n 2013\n \n \n (7)\n \n \n
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\n \n\n \n \n Ertan, H. B.; and Keysan, O.\n\n\n \n \n \n \n \n Implementation issues of real time position estimation for induction motors using rotor slot harmonics.\n \n \n \n \n\n\n \n\n\n\n In 4th International Conference on Power Engineering, Energy and Electrical Drives, pages 1826–1832, Istanbul, may 2013. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"ImplementationPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 6 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Ertan2013,\naddress = {Istanbul},\nauthor = {Ertan, H. Bulent and Keysan, Ozan},\nbooktitle = {4th International Conference on Power Engineering, Energy and Electrical Drives},\ndoi = {10.1109/PowerEng.2013.6635895},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Ertan, Keysan - 2013 - Implementation issues of real time position estimation for induction motors using rotor slot harmonics.pdf:pdf},\nisbn = {978-1-4673-6392-1},\nkeywords = {-real-time,demodulation,estimation,indirect control,position,rotor slot harmonics,vector control},\nmonth = {may},\nnumber = {2},\npages = {1826--1832},\npublisher = {IEEE},\ntitle = {{Implementation issues of real time position estimation for induction motors using rotor slot harmonics}},\nurl = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6635895},\nyear = {2013}\n}\n
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\n \n\n \n \n Keysan, O.; and Ertan, H. B.\n\n\n \n \n \n \n \n Real-Time Speed and Position Estimation Using Rotor Slot Harmonics.\n \n \n \n \n\n\n \n\n\n\n IEEE Transactions on Industrial Informatics, 9(2): 899–908. may 2013.\n \n\n\n\n
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@article{Keysan2012d,\nabstract = {It is well known that slotting harmonics exist in most of the electrical machines. So far these harmonics are mainly identified using spectral estimation techniques. However, this approach requires long sampling and computation periods. In this study, a novel speed and position estimation method, based on identification of rotor slot harmonics that does not require any kind of spectral analysis is proposed. The required information is extracted by demodulating the information available in an external search coil (or in phase current). The algorithm used for this purpose is fast and can be applied within a typical control cycle of a vector controlled drive algorithm. In the application of the method here, higher order rotor slot harmonics have been utilized. In this manner, the position estimation resolution increases and also possible effect of harmonics stemming from other sources are avoided. The approach is explained in the paper and illustrated with experimental results.},\nauthor = {Keysan, Ozan and Ertan, H. Bulent},\ndoi = {10.1109/TII.2012.2210231},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Ertan - 2013 - Real-Time Speed and Position Estimation Using Rotor Slot Harmonics.pdf:pdf},\nissn = {1551-3203},\njournal = {IEEE Transactions on Industrial Informatics},\nkeywords = {Induction machines,demodulation,rotor position estimation,rotor slot harmonics,search coil,spectral analysis,velocity estimation},\nmonth = {may},\nnumber = {2},\npages = {899--908},\ntitle = {{Real-Time Speed and Position Estimation Using Rotor Slot Harmonics}},\nurl = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6248699},\nvolume = {9},\nyear = {2013}\n}\n
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\n It is well known that slotting harmonics exist in most of the electrical machines. So far these harmonics are mainly identified using spectral estimation techniques. However, this approach requires long sampling and computation periods. In this study, a novel speed and position estimation method, based on identification of rotor slot harmonics that does not require any kind of spectral analysis is proposed. The required information is extracted by demodulating the information available in an external search coil (or in phase current). The algorithm used for this purpose is fast and can be applied within a typical control cycle of a vector controlled drive algorithm. In the application of the method here, higher order rotor slot harmonics have been utilized. In this manner, the position estimation resolution increases and also possible effect of harmonics stemming from other sources are avoided. The approach is explained in the paper and illustrated with experimental results.\n
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\n \n\n \n \n Keysan, O.; Burchell, J.; and Mueller, M. A\n\n\n \n \n \n \n \n Magnetic and structural analysis of a transverse flux claw pole linear machine.\n \n \n \n \n\n\n \n\n\n\n In 2013 IEEE International Conference on Industrial Technology (ICIT), pages 1904–1908, Cape Town, feb 2013. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"MagneticPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 3 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@inproceedings{Keysan2013a,\nabstract = {This paper details the design and testing of a novel transverse flux claw pole linear machine suitable for large superconducting generators. The machine utilises a modular claw pole transducer design with a stationary field winding which eliminates the need for cryogenic couplers and electrical brushes for a superconducting machine. The results from this prototype will enable a better understanding of the electromagnetic and mechanical structures before embarking on a more costly super- conducting design. The structure of the prototype supports a field winding and core; four pairs of claw poles with a stroke of 500 mm; three armature windings and core. Tests will be preformed to determine the deflection of the airgap, field core and armature core, the induced voltage in the armature coils, the forces acting on the structure and the flux density variation in the claw poles.},\naddress = {Cape Town},\nauthor = {Keysan, Ozan and Burchell, Joe and Mueller, Markus A},\nbooktitle = {2013 IEEE International Conference on Industrial Technology (ICIT)},\ndoi = {10.1109/ICIT.2013.6505968},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Burchell, Mueller - 2013 - Magnetic and structural analysis of a transverse flux claw pole linear machine.pdf:pdf},\nisbn = {978-1-4673-4569-9},\nkeywords = {claw pole},\nmonth = {feb},\npages = {1904--1908},\npublisher = {IEEE},\ntitle = {{Magnetic and structural analysis of a transverse flux claw pole linear machine}},\nurl = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6505968},\nyear = {2013}\n}\n
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\n This paper details the design and testing of a novel transverse flux claw pole linear machine suitable for large superconducting generators. The machine utilises a modular claw pole transducer design with a stationary field winding which eliminates the need for cryogenic couplers and electrical brushes for a superconducting machine. The results from this prototype will enable a better understanding of the electromagnetic and mechanical structures before embarking on a more costly super- conducting design. The structure of the prototype supports a field winding and core; four pairs of claw poles with a stroke of 500 mm; three armature windings and core. Tests will be preformed to determine the deflection of the airgap, field core and armature core, the induced voltage in the armature coils, the forces acting on the structure and the flux density variation in the claw poles.\n
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\n \n\n \n \n Keysan, O.\n\n\n \n \n \n \n \n Application of high-temperature superconducting machines to direct drive renewable energy systems.\n \n \n \n \n\n\n \n\n\n\n In Mueller, M.; and Polinder, H., editor(s), Electrical Drives for Direct Drive Renewable Energy Systems, pages 219–252. Elsevier, 2013.\n \n\n\n\n
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@incollection{Keysan2013,\nauthor = {Keysan, Ozan},\nbooktitle = {Electrical Drives for Direct Drive Renewable Energy Systems},\ndoi = {10.1533/9780857097491.2.219},\neditor = {Mueller, Markus and Polinder, H.},\nisbn = {84569-783-9},\npages = {219--252},\npublisher = {Elsevier},\ntitle = {{Application of high-temperature superconducting machines to direct drive renewable energy systems}},\nurl = {http://www.sciencedirect.com/science/article/pii/B9781845697839500109},\nyear = {2013}\n}\n
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\n \n\n \n \n Lara, M. R.; and Keysan, O.\n\n\n \n \n \n \n Detection of Electrical Machine Faults Using Smart Phones.\n \n \n \n\n\n \n\n\n\n 2013.\n \n\n\n\n
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@unpublished{Lara2013,\nauthor = {Lara, M. Recio and Keysan, Ozan},\ntitle = {{Detection of Electrical Machine Faults Using Smart Phones}},\nyear = {2013}\n}\n
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\n \n\n \n \n Echenique, E. J.; Keysan, O.; and Mueller, M. A.\n\n\n \n \n \n \n \n Rotor loss prediction in air-cored permanent magnet machines.\n \n \n \n \n\n\n \n\n\n\n In Chicago, editor(s), 2013 International Electric Machines & Drives Conference, pages 303–310, may 2013. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"RotorPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 3 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@inproceedings{Echenique2013,\nauthor = {Echenique, Estanislao J.P. and Keysan, Ozan and Mueller, Markus A.},\nbooktitle = {2013 International Electric Machines & Drives Conference},\ndoi = {10.1109/IEMDC.2013.6556268},\neditor = {Chicago},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Echenique, Keysan, Mueller - 2013 - Rotor loss prediction in air-cored permanent magnet machines.pdf:pdf},\nisbn = {978-1-4673-4974-1},\nmonth = {may},\npages = {303--310},\npublisher = {IEEE},\ntitle = {{Rotor loss prediction in air-cored permanent magnet machines}},\nurl = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6556268},\nyear = {2013}\n}\n
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\n \n\n \n \n Mueller, M.; and Keysan, O.\n\n\n \n \n \n \n \n An open source tool to estimate mass and efficiency of wind turbine power take-off systems.\n \n \n \n \n\n\n \n\n\n\n In 2nd IET Renewable Power Generation Conference (RPG 2013), pages 3.15–3.15, Bejing, 2013. Institution of Engineering and Technology\n \n\n\n\n
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@inproceedings{Keysan2013b,\naddress = {Bejing},\nauthor = {Mueller, M.A. and Keysan, Ozan},\nbooktitle = {2nd IET Renewable Power Generation Conference (RPG 2013)},\ndoi = {10.1049/cp.2013.1822},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Mueller, Keysan - 2013 - An open source tool to estimate mass and efficiency of wind turbine power take-off systems.pdf:pdf},\nisbn = {978-1-84919-758-8},\npages = {3.15--3.15},\npublisher = {Institution of Engineering and Technology},\ntitle = {{An open source tool to estimate mass and efficiency of wind turbine power take-off systems}},\nurl = {http://digital-library.theiet.org/content/conferences/10.1049/cp.2013.1822},\nyear = {2013}\n}\n
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\n  \n 2012\n \n \n (9)\n \n \n
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\n \n\n \n \n Keysan, O; and Mueller, M.\n\n\n \n \n \n \n \n A linear superconducting generator for wave energy converters.\n \n \n \n \n\n\n \n\n\n\n In 6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012), pages B134–B134, Bristol, 2012. IET\n \n\n\n\n
\n\n\n\n \n \n \"APaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Keysan2012,\nabstract = {Direct-drive superconducting linear generators can be an alternative for wave energy converter power take-off systems. A novel superconducting generator topology is presented in this paper. The generator has a stationary superconducting field winding fixed to modular magnetic cores. The translator is composed of air-cored copper windings. The generator is suitable for low-speed, high-torque applications. A 640 kW linear generator is designed. The design is validated using FEA tools and the specifications of the generator are presented.},\naddress = {Bristol},\nauthor = {Keysan, O and Mueller, M.A.},\nbooktitle = {6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012)},\ndoi = {10.1049/cp.2012.0298},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Mueller - 2012 - A linear superconducting generator for wave energy converters.pdf:pdf},\nisbn = {978-1-84919-616-1},\nkeywords = {HTSG,direct-drive,linear,power generation,superconducting linear generator,wave energy},\nmendeley-tags = {HTSG,linear,wave energy},\npages = {B134--B134},\npublisher = {IET},\ntitle = {{A linear superconducting generator for wave energy converters}},\nurl = {http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6242150},\nyear = {2012}\n}\n
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\n Direct-drive superconducting linear generators can be an alternative for wave energy converter power take-off systems. A novel superconducting generator topology is presented in this paper. The generator has a stationary superconducting field winding fixed to modular magnetic cores. The translator is composed of air-cored copper windings. The generator is suitable for low-speed, high-torque applications. A 640 kW linear generator is designed. The design is validated using FEA tools and the specifications of the generator are presented.\n
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\n \n\n \n \n Keysan, O.; and Ertan, H B.\n\n\n \n \n \n \n \n Asenkron Motorlarda Oluk Sayısının Gövde Dışına Takılan Bir Bobinle Belirlenmesi.\n \n \n \n \n\n\n \n\n\n\n EMO Bilimsel Dergi, 2(3): 29–35. 2012.\n \n\n\n\n
\n\n\n\n \n \n \"AsenkronPaper\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 7 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Keysan2012c,\nabstract = {Motor oluk sayısının bilinmesi ihtiyacı motor kontrol{\\"{u}}nde ve “durum izleme” algoritmalarında ortaya {\\c{c}}ıkmaktadır. Bu makalede rotor oluk sayısını kestirmek i{\\c{c}}in sunulan y{\\"{o}}ntem, bir s{\\"{u}}r{\\"{u}}c{\\"{u}} s{\\"{u}}receği motora bağlandığında “tanıma” algoritması i{\\c{c}}inde kolayca uygulanabilecek bir y{\\"{o}}ntemdir. Y{\\"{o}}ntem motor akımları {\\"{u}}zerinden uygulanabileceği gibi, g{\\"{o}}vde {\\"{u}}zerine yerleştirilecek basit bir bobin aracılığı ile de uygulanabilir. Bu nedenle ekipmanın mekanik d{\\"{u}}zeninde hi{\\c{c}} bir değişikliğe ihtiya{\\c{c}} bırakmaz. Makalede y{\\"{o}}ntemin dayandığı teori sunulduktan sonra, yapılan deneylerle kutup sayısından bağımsız olarak doğru sonu{\\c{c}}lar verdiği g{\\"{o}}sterilmiştir. Ayrıca kestirim hassasiyeti motor y{\\"{u}}k{\\"{u}}ne de bağımlı değildir. Bir PWM s{\\"{u}}r{\\"{u}}c{\\"{u}} ile değişik frakanslarda da deneyler yapılmıştır. Bu şartlarda da hassas olarak oluk sayısı belirlenebilmektedir. Ancak, {\\"{o}}zellikle d{\\"{u}}ş{\\"{u}}k frekanslarda birden fazla veri alınması gereği ortaya {\\c{c}}ıkabilmektedir.},\nauthor = {Keysan, Ozan and Ertan, H B{\\"{u}}lent},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Ertan - 2012 - Asenkron Motorlarda Oluk Sayısının G{\\"{o}}vde Dışına Takılan Bir Bobinle Belirlenmesi.pdf:pdf},\njournal = {EMO Bilimsel Dergi},\nkeywords = {Asenkron motor,kestirim,oluk sayısı,rotor oluk harmonikleri,{\\c{c}}ıkıntı harmonikleri},\nnumber = {3},\npages = {29--35},\ntitle = {{Asenkron Motorlarda Oluk Sayısının G{\\"{o}}vde Dışına Takılan Bir Bobinle Belirlenmesi}},\nurl = {http://edergi.emomerkez.net/index.php/EMOBILIMSEL/article/view/32},\nvolume = {2},\nyear = {2012}\n}\n
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\n Motor oluk sayısının bilinmesi ihtiyacı motor kontrolünde ve “durum izleme” algoritmalarında ortaya çıkmaktadır. Bu makalede rotor oluk sayısını kestirmek için sunulan yöntem, bir sürücü süreceği motora bağlandığında “tanıma” algoritması içinde kolayca uygulanabilecek bir yöntemdir. Yöntem motor akımları üzerinden uygulanabileceği gibi, gövde üzerine yerleştirilecek basit bir bobin aracılığı ile de uygulanabilir. Bu nedenle ekipmanın mekanik düzeninde hiç bir değişikliğe ihtiyaç bırakmaz. Makalede yöntemin dayandığı teori sunulduktan sonra, yapılan deneylerle kutup sayısından bağımsız olarak doğru sonuçlar verdiği gösterilmiştir. Ayrıca kestirim hassasiyeti motor yüküne de bağımlı değildir. Bir PWM sürücü ile değişik frakanslarda da deneyler yapılmıştır. Bu şartlarda da hassas olarak oluk sayısı belirlenebilmektedir. Ancak, özellikle düşük frekanslarda birden fazla veri alınması gereği ortaya çıkabilmektedir.\n
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\n \n\n \n \n Ertan, H B.; and Keysan, O.\n\n\n \n \n \n \n Rotor Oluk Harmoniklerini Kullanarak Asenkron Motorlar İçin Gerçek Zamanda Sensörsüz Hız ve Konum Kestirimi.\n \n \n \n\n\n \n\n\n\n In Eletrik-Elektronik ve Bilgisayar Mühendisliği Sempozyumu, pages 1–6, 2012. \n \n\n\n\n
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@inproceedings{Ertan2012,\nabstract = {Sens{\\"{o}}rs{\\"{u}}z hız kestirimi i{\\c{c}}in kullanılan teknikler vekt{\\"{o}}r kontrol i{\\c{c}}in kullanıla gelmektedir. Ancak bu y{\\"{o}}ntemle denetlenen motorlardan elde edilen performansın, sens{\\"{o}}rl{\\"{u}} y{\\"{o}}ntemler kadar iyi olmadığı bilinmektedir. Bu bildiri sens{\\"{o}}rs{\\"{u}}z s{\\"{u}}r{\\"{u}}c{\\"{u}}lerden sens{\\"{o}}rl{\\"{u}} s{\\"{u}}r{\\"{u}}c{\\"{u}}ler kadar iyi performans elde etme sorununa bir {\\c{c}}{\\"{o}}z{\\"{u}}m bulmak i{\\c{c}}in yapılan bir {\\c{c}}alışmayı anlatmaktadır. Performansı iyileştirmek i{\\c{c}}in en akılcı yol motorun kendi geometrisinden kaynaklanan ve manyetik alan i{\\c{c}}inde izleri takip edilebilen sinyalleri yakalamaktır. Bu tip bilgi rotor yuvarlaklığının bozukluğundan, stator ve rotor oluklarının yarattığı alan bozulmasından veya başka manyetik alan asimetrilerinden elde edilebilir. {\\"{O}}zellikle rotor oluk harmonikleri diagnostik ama{\\c{c}}lı olarak kullanıla gelmektedir. Bu yaklaşım motor akısı i{\\c{c}}inde oluşan harmoniklerin akımda end{\\"{u}}klediği gerilim bileşenlerini yakalayarak veya hava aralığı akısını algılayarak uygulanabilmektedir. Yapılan işlem akım veya end{\\"{u}}klenen gerilimden bir {\\"{o}}rnekleme yapmak ve FFT analiz y{\\"{o}}ntemleri kullanılarak rotor oluklarından kaynaklanan bileşenleri ayırmak şeklinde olmaktadır. Ancak bu y{\\"{o}}ntemde {\\"{o}}rnek alınması ve hesaplama, mili saniye mertebesinde s{\\"{u}}rmekte ve ger{\\c{c}}ek zamanda uygulanması vekt{\\"{o}}r kontrollu sistemler a{\\c{c}}ısından herhangi bir fayda sağlamamaktadır. Burada sunulan yaklaşımda ise rotor oluk harmoniklerini i{\\c{c}}eren sinyal ger{\\c{c}}ek zamanda işlenebilmekte ve sonu{\\c{c}} mikro saniyeler i{\\c{c}}erisinde alınabilmektedir. Y{\\"{o}}ntemin {\\"{o}}z{\\"{u}} motordan elde edilen sinyalin; besleme gerilimi frekansında bir gerilim {\\"{u}}zerine bindirilmiş olarak rotor oluk harmoniklerini i{\\c{c}}eren bir başka sinyalin varlığının farkına varılmış olmasıdır. Bu durumda rotor oluk harmoniklerini ayıklamak basit bir demod{\\"{u}}lasyon işlemine d{\\"{o}}n{\\"{u}}şmektedir. Bildiri g{\\"{o}}zlemin arkasında yatan teoriyi a{\\c{c}}ıkladıktan sonra, demod{\\"{u}}lasyon işleminin nasıl yapılacağını g{\\"{o}}stermektedir. {\\"{O}}ne s{\\"{u}}r{\\"{u}}len yaklaşım bir deney ortamında uygulanarak yaklaşımın ge{\\c{c}}erliliği g{\\"{o}}sterilmiştir. Bu yaklaşımla rotor olukları bir encoder gibi kullanılarak ger{\\c{c}}ek zamanda sens{\\"{o}}rs{\\"{u}}z olarak rotor konumu veya hızı elde edilebilmektedir. Bu nedenle de sens{\\"{o}}rs{\\"{u}}z s{\\"{u}}r{\\"{u}}c{\\"{u}}lerin performansının sens{\\"{o}}rl{\\"{u}} s{\\"{u}}r{\\"{u}}c{\\"{u}}ler kadar iyi olması imkanı doğmaktadır.},\nauthor = {Ertan, H B{\\"{u}}lent and Keysan, Ozan},\nbooktitle = {Eletrik-Elektronik ve Bilgisayar M{\\"{u}}hendisliği Sempozyumu},\npages = {1--6},\ntitle = {{Rotor Oluk Harmoniklerini Kullanarak Asenkron Motorlar İ{\\c{c}}in Ger{\\c{c}}ek Zamanda Sens{\\"{o}}rs{\\"{u}}z Hız ve Konum Kestirimi}},\nyear = {2012}\n}\n
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\n Sensörsüz hız kestirimi için kullanılan teknikler vektör kontrol için kullanıla gelmektedir. Ancak bu yöntemle denetlenen motorlardan elde edilen performansın, sensörlü yöntemler kadar iyi olmadığı bilinmektedir. Bu bildiri sensörsüz sürücülerden sensörlü sürücüler kadar iyi performans elde etme sorununa bir çözüm bulmak için yapılan bir çalışmayı anlatmaktadır. Performansı iyileştirmek için en akılcı yol motorun kendi geometrisinden kaynaklanan ve manyetik alan içinde izleri takip edilebilen sinyalleri yakalamaktır. Bu tip bilgi rotor yuvarlaklığının bozukluğundan, stator ve rotor oluklarının yarattığı alan bozulmasından veya başka manyetik alan asimetrilerinden elde edilebilir. Özellikle rotor oluk harmonikleri diagnostik amaçlı olarak kullanıla gelmektedir. Bu yaklaşım motor akısı içinde oluşan harmoniklerin akımda endüklediği gerilim bileşenlerini yakalayarak veya hava aralığı akısını algılayarak uygulanabilmektedir. Yapılan işlem akım veya endüklenen gerilimden bir örnekleme yapmak ve FFT analiz yöntemleri kullanılarak rotor oluklarından kaynaklanan bileşenleri ayırmak şeklinde olmaktadır. Ancak bu yöntemde örnek alınması ve hesaplama, mili saniye mertebesinde sürmekte ve gerçek zamanda uygulanması vektör kontrollu sistemler açısından herhangi bir fayda sağlamamaktadır. Burada sunulan yaklaşımda ise rotor oluk harmoniklerini içeren sinyal gerçek zamanda işlenebilmekte ve sonuç mikro saniyeler içerisinde alınabilmektedir. Yöntemin özü motordan elde edilen sinyalin; besleme gerilimi frekansında bir gerilim üzerine bindirilmiş olarak rotor oluk harmoniklerini içeren bir başka sinyalin varlığının farkına varılmış olmasıdır. Bu durumda rotor oluk harmoniklerini ayıklamak basit bir demodülasyon işlemine dönüşmektedir. Bildiri gözlemin arkasında yatan teoriyi açıkladıktan sonra, demodülasyon işleminin nasıl yapılacağını göstermektedir. Öne sürülen yaklaşım bir deney ortamında uygulanarak yaklaşımın geçerliliği gösterilmiştir. Bu yaklaşımla rotor olukları bir encoder gibi kullanılarak gerçek zamanda sensörsüz olarak rotor konumu veya hızı elde edilebilmektedir. Bu nedenle de sensörsüz sürücülerin performansının sensörlü sürücüler kadar iyi olması imkanı doğmaktadır.\n
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\n \n\n \n \n Keysan, O.; and Mueller, M. A\n\n\n \n \n \n \n \n A Transverse Flux High-Temperature Superconducting Generator Topology for Large Direct Drive Wind Turbines.\n \n \n \n \n\n\n \n\n\n\n Physics Procedia, 36: 759–764. jan 2012.\n \n\n\n\n
\n\n\n\n \n \n \"APaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Keysan2011e,\nabstract = {The cost and mass of an offshore wind turbine power-train can be reduced by using high-temperature supercon- ducting generators, but for a successful commercial design the superconducting generator should be as reliable as its alternatives. In this paper, we present a novel transverse flux superconducting generator topology which is suitable for low-speed, high-torque applications. The generator is designed with a stationary superconducting field winding and a variable reluctance claw pole motor for simplified mechanical structure and maximum reliability. 3D FEA simulation results of a 70 kW prototype is presented.},\nauthor = {Keysan, Ozan and Mueller, Markus A},\ndoi = {10.1016/j.phpro.2012.06.039},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Mueller - 2012 - A Transverse Flux High-Temperature Superconducting Generator Topology for Large Direct Drive Wind Turbines.pdf:pdf},\nissn = {18753892},\njournal = {Physics Procedia},\nkeywords = {HTSG,claw pole,direct drive,keywords,offshore wind,superconducting generator,transverse flux},\nmendeley-tags = {HTSG,transverse flux},\nmonth = {jan},\npages = {759--764},\ntitle = {{A Transverse Flux High-Temperature Superconducting Generator Topology for Large Direct Drive Wind Turbines}},\nurl = {http://linkinghub.elsevier.com/retrieve/pii/S1875389212019761},\nvolume = {36},\nyear = {2012}\n}\n
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\n The cost and mass of an offshore wind turbine power-train can be reduced by using high-temperature supercon- ducting generators, but for a successful commercial design the superconducting generator should be as reliable as its alternatives. In this paper, we present a novel transverse flux superconducting generator topology which is suitable for low-speed, high-torque applications. The generator is designed with a stationary superconducting field winding and a variable reluctance claw pole motor for simplified mechanical structure and maximum reliability. 3D FEA simulation results of a 70 kW prototype is presented.\n
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\n \n\n \n \n Keysan, O.; Mueller, M.; McDonald, A.; Hodgins, N.; and Shek, J.\n\n\n \n \n \n \n \n Designing the C-GEN lightweight direct drive generator for wave and tidal energy.\n \n \n \n \n\n\n \n\n\n\n IET Renewable Power Generation, 6(3): 161. 2012.\n \n\n\n\n
\n\n\n\n \n \n \"DesigningPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 6 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Keysan2012e,\nabstract = {The C-GEN is a novel permanent magnet generator aimed at reducing overall system mass in direct drive power takeoff applications. The design of a C-GEN generator requires the combination of electromagnetic, structural and thermal models. Models used in the development of design tools applicable to both rotary and linear C-GEN generators are described in this study. The design tool is verified with the experiment results obtained from a 15 kW prototype. A genetic optimisation algorithm is developed combining the analytical model with economical issues to search for most suitable designs for specific applications. Designs are presented using the optimisation design tool for two marine renewable applications: a wave device called Oyster developed by Aquamarine Power and a tidal current device developed by Scotrenewables.},\nauthor = {Keysan, O. and Mueller, M. and McDonald, A.S. and Hodgins, N. and Shek, J.},\ndoi = {10.1049/iet-rpg.2009.0213},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan et al. - 2012 - Designing the C-GEN lightweight direct drive generator for wave and tidal energy.pdf:pdf},\nissn = {17521416},\njournal = {IET Renewable Power Generation},\nkeywords = {air-cored,optimization,permanent magnet generator,tidal energy,wave energy},\nnumber = {3},\npages = {161},\ntitle = {{Designing the C-GEN lightweight direct drive generator for wave and tidal energy}},\nurl = {http://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2009.0213},\nvolume = {6},\nyear = {2012}\n}\n
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\n The C-GEN is a novel permanent magnet generator aimed at reducing overall system mass in direct drive power takeoff applications. The design of a C-GEN generator requires the combination of electromagnetic, structural and thermal models. Models used in the development of design tools applicable to both rotary and linear C-GEN generators are described in this study. The design tool is verified with the experiment results obtained from a 15 kW prototype. A genetic optimisation algorithm is developed combining the analytical model with economical issues to search for most suitable designs for specific applications. Designs are presented using the optimisation design tool for two marine renewable applications: a wave device called Oyster developed by Aquamarine Power and a tidal current device developed by Scotrenewables.\n
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\n \n\n \n \n Keysan, O.; and Mueller, M. A.\n\n\n \n \n \n \n Marina Platform Deliverable 7.3, Critical Components for Wave Energy Converter Power Take-off Systems.\n \n \n \n\n\n \n\n\n\n Technical Report 2012.\n \n\n\n\n
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@techreport{Keysan2012g,\nauthor = {Keysan, Ozan and Mueller, Markus A.},\npages = {1--48},\ntitle = {{Marina Platform Deliverable 7.3, Critical Components for Wave Energy Converter Power Take-off Systems}},\nyear = {2012}\n}\n
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\n \n\n \n \n Hodgins, N.; Keysan, O.; McDonald, A.; and Mueller, M. A.\n\n\n \n \n \n \n \n Design and Testing of a Linear Generator for Wave-Energy Applications.\n \n \n \n \n\n\n \n\n\n\n IEEE Transactions on Industrial Electronics, 59(5): 2094–2103. may 2012.\n \n\n\n\n
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@article{Hodgins2011a,\nabstract = {A linear generator topology is proposed for wave energy applications. The main significance of the generator topology is that the relative position of the magnets, copper and steel has been chosen so that there are no magnetic attraction forces between the stator and permanent magnet translator. The lack of magnetic forces and the modular nature of the generator topology makes the manufacture and assembly of the generator easier than a conventional iron-cored permanent magnet linear generator. Analytical modelling techniques are described with a genetic algorithm optimization method. The proposed topology is implemented to Archimedes Wave Swing wave energy converter. A 50 kW prototype has been built to prove the concept and the no-load and load test results are presented.},\nauthor = {Hodgins, Neil and Keysan, Ozan and McDonald, A.S. and Mueller, Markus A.},\ndoi = {10.1109/TIE.2011.2141103},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Hodgins et al. - 2012 - Design and Testing of a Linear Generator for Wave-Energy Applications.pdf:pdf},\nissn = {0278-0046},\njournal = {IEEE Transactions on Industrial Electronics},\nkeywords = {air-cored,direct-drive generator,linear electrical machines,linear generator,linear permanent magnet,marine energy,marine power,wave energy,wave energy converter},\nmonth = {may},\nnumber = {5},\npages = {2094--2103},\ntitle = {{Design and Testing of a Linear Generator for Wave-Energy Applications}},\nurl = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5746524},\nvolume = {59},\nyear = {2012}\n}\n
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\n A linear generator topology is proposed for wave energy applications. The main significance of the generator topology is that the relative position of the magnets, copper and steel has been chosen so that there are no magnetic attraction forces between the stator and permanent magnet translator. The lack of magnetic forces and the modular nature of the generator topology makes the manufacture and assembly of the generator easier than a conventional iron-cored permanent magnet linear generator. Analytical modelling techniques are described with a genetic algorithm optimization method. The proposed topology is implemented to Archimedes Wave Swing wave energy converter. A 50 kW prototype has been built to prove the concept and the no-load and load test results are presented.\n
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\n \n\n \n \n Keysan, O.; and Mueller, M. A.\n\n\n \n \n \n \n Marina Platform Deliverable 7.2.2, Wind Energy System Components.\n \n \n \n\n\n \n\n\n\n Technical Report 2012.\n \n\n\n\n
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@techreport{Keysan2012f,\nauthor = {Keysan, Ozan and Mueller, Markus A.},\npages = {1--67},\ntitle = {{Marina Platform Deliverable 7.2.2, Wind Energy System Components}},\nyear = {2012}\n}\n
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\n \n\n \n \n Keysan, O.; Olczak, D.; and Mueller, M. A\n\n\n \n \n \n \n \n A Modular Superconducting Generator for Offshore Wind Turbines.\n \n \n \n \n\n\n \n\n\n\n Journal of Superconductivity and Novel Magnetism, 26(5): 2103–2108. dec 2012.\n \n\n\n\n
\n\n\n\n \n \n \"APaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 12 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Keysan2012a,\nabstract = {In this study a new claw-pole type trans- verse flux superconducting generator topology is pre- sented. The machine has a stationary superconducting field winding which eliminates electrical brushes and cryocouplers. The machine is specifically designed for low-speed high torque applications such as large off- shore wind turbines. The proposed machine is robust and has a modular structure. A 30 kW, 100 rpm prototype is planned to be man- ufactured to prove the concept. MgB2, YBCO, BSSCO wires are compared in terms of wire length, operating temperature and cost. The magnetic flux penetrating into superconducting wire has been simulated using 3D FEA software. Moreover, mechanical loads is estimated and the deflections in the structure is analysed. Keywords superconducting generator {\\textperiodcentered} wind en},\naddress = {Istanbul},\nauthor = {Keysan, Ozan and Olczak, Dariusz and Mueller, Markus A},\ndoi = {10.1007/s10948-012-1950-1},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Olczak, Mueller - 2012 - A Modular Superconducting Generator for Offshore Wind Turbines.pdf:pdf},\nissn = {1557-1939},\njournal = {Journal of Superconductivity and Novel Magnetism},\nkeywords = {HTSG,claw-pole,direct-drive,offshore wind,superconducting generator,transverse flux,wind energy,wind turbine},\nmendeley-tags = {HTSG,wind turbine},\nmonth = {dec},\nnumber = {5},\npages = {2103--2108},\ntitle = {{A Modular Superconducting Generator for Offshore Wind Turbines}},\nurl = {http://link.springer.com/10.1007/s10948-012-1950-1},\nvolume = {26},\nyear = {2012}\n}\n
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\n In this study a new claw-pole type trans- verse flux superconducting generator topology is pre- sented. The machine has a stationary superconducting field winding which eliminates electrical brushes and cryocouplers. The machine is specifically designed for low-speed high torque applications such as large off- shore wind turbines. The proposed machine is robust and has a modular structure. A 30 kW, 100 rpm prototype is planned to be man- ufactured to prove the concept. MgB2, YBCO, BSSCO wires are compared in terms of wire length, operating temperature and cost. The magnetic flux penetrating into superconducting wire has been simulated using 3D FEA software. Moreover, mechanical loads is estimated and the deflections in the structure is analysed. Keywords superconducting generator ˙ wind en\n
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\n \n\n \n \n Keysan, O.; and Mueller, M. A.\n\n\n \n \n \n \n \n A Homopolar HTSG Topology for Large Direct-Drive Wind Turbines.\n \n \n \n \n\n\n \n\n\n\n IEEE Transactions on Applied Superconductivity, 21(5): 3523–3531. oct 2011.\n \n\n\n\n
\n\n\n\n \n \n \"APaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 9 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@article{Keysan2011b,\nabstract = {For offshore wind energy, there is a trend toward larger wind turbines. The increased mass of a power-takeoff system increases the installation cost of the turbine. Direct-drive superconducting generators have the potential to reduce the installation cost of wind turbines. For a successful entry to the off- shore-wind-energy market, a high-temperature superconducting generator should be as reliable as conventional generators. It is proposed that a stationary superconducting direct-current-field winding may increase the reliability of the generator. An axial-flux homopolar generator topology is proposed to be used in low-speed high-torque applications. The topology is modified by using two superconducting field windings to obtain a bipolar flux-density distribution for higher power density. Different core types and dimensions were examined to find the most suitable design, and a conceptual design of a 6-MW 12-r/min generator is presented.},\nauthor = {Keysan, Ozan and Mueller, Markus A.},\ndoi = {10.1109/TASC.2011.2159005},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Mueller - 2011 - A Homopolar HTSG Topology for Large Direct-Drive Wind Turbines.pdf:pdf},\nissn = {1051-8223},\njournal = {IEEE Transactions on Applied Superconductivity},\nkeywords = {Direct drive,HTSG,energy,homopolar generator,offshore,offshore wind,superconducting generator,wind turbine,wind turbine.,wind-power generation},\nmendeley-tags = {HTSG,offshore,wind turbine},\nmonth = {oct},\nnumber = {5},\npages = {3523--3531},\ntitle = {{A Homopolar HTSG Topology for Large Direct-Drive Wind Turbines}},\nurl = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5948361},\nvolume = {21},\nyear = {2011}\n}\n
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\n For offshore wind energy, there is a trend toward larger wind turbines. The increased mass of a power-takeoff system increases the installation cost of the turbine. Direct-drive superconducting generators have the potential to reduce the installation cost of wind turbines. For a successful entry to the off- shore-wind-energy market, a high-temperature superconducting generator should be as reliable as conventional generators. It is proposed that a stationary superconducting direct-current-field winding may increase the reliability of the generator. An axial-flux homopolar generator topology is proposed to be used in low-speed high-torque applications. The topology is modified by using two superconducting field windings to obtain a bipolar flux-density distribution for higher power density. Different core types and dimensions were examined to find the most suitable design, and a conceptual design of a 6-MW 12-r/min generator is presented.\n
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\n \n\n \n \n Keysan, O.; and Mueller, M.\n\n\n \n \n \n \n \n Superconducting generators for renewable energy applications.\n \n \n \n \n\n\n \n\n\n\n In IET Conference on Renewable Power Generation (RPG 2011), volume 2020, pages 12–12, Edinburgh, 2011. IET\n \n\n\n\n
\n\n\n\n \n \n \"SuperconductingPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 5 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Keysan2011d,\nabstract = {There is a trend toward higher power rated machines for offshore wind turbines. The maximum power rating for a high-speed, geared power-takeoff system is around 5MW. For even higher power rated turbines, direct-drive generators becomes enormously heavy. Direct-drive superconducting generators have the potential to reduce the overall mass and installation costs of an offshore wind turbine. In this study, a conventional homopolar superconducting generator design is presented that is suitable for low-speed, high-torque direct- drive applications. The generator has been designed with a stationary dc-field winding to increase the reliability of the generator. Also, a linear version of the generator is presented.},\naddress = {Edinburgh},\nauthor = {Keysan, Ozan and Mueller, M.A.},\nbooktitle = {IET Conference on Renewable Power Generation (RPG 2011)},\ndoi = {10.1049/cp.2011.0102},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Mueller - 2011 - Superconducting generators for renewable energy applications.pdf:pdf},\nisbn = {978-1-84919-536-2},\nkeywords = {HTSG,direct-drive,homopolar,offshore,superconducting generator,wave energy,wind energy},\nmendeley-tags = {HTSG,homopolar},\npages = {12--12},\npublisher = {IET},\ntitle = {{Superconducting generators for renewable energy applications}},\nurl = {http://digital-library.theiet.org/content/conferences/10.1049/cp.2011.0102},\nvolume = {2020},\nyear = {2011}\n}\n
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\n There is a trend toward higher power rated machines for offshore wind turbines. The maximum power rating for a high-speed, geared power-takeoff system is around 5MW. For even higher power rated turbines, direct-drive generators becomes enormously heavy. Direct-drive superconducting generators have the potential to reduce the overall mass and installation costs of an offshore wind turbine. In this study, a conventional homopolar superconducting generator design is presented that is suitable for low-speed, high-torque direct- drive applications. The generator has been designed with a stationary dc-field winding to increase the reliability of the generator. Also, a linear version of the generator is presented.\n
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\n \n\n \n \n Keysan, O.; and Ertan, H. B.\n\n\n \n \n \n \n Speed and Rotor Position Estimation of Electrical Machines Using Rotor Slot Harmonics and Higher Order Rotor Slot Harmonics.\n \n \n \n\n\n \n\n\n\n 2011.\n \n\n\n\n
\n\n\n\n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 8 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@misc{Keysan2011g,\nabstract = {The present invention is a method and a system developed for speed and rotor position estimation of electrical machines. In this invention, rotor slot harmonics are detected either from the motor current or voltage or voltage induced on an external search coil or by similar means. The excitation frequency component of the signal used is eliminated; rotor slot harmonics are extracted from the resulting signal via demodulation. Rotor speed and position is obtained by processing the rotor slot harmonic variation in real time; and this process does not employ any spectral analysis technique.},\nauthor = {Keysan, Ozan and Ertan, H. B.},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Ertan - 2011 - Speed and Rotor Position Estimation of Electrical Machines Using Rotor Slot Harmonics and Higher Order Rotor Slot.pdf:pdf},\ninstitution = {Middle East Technical University},\nkeywords = {induction motor,master tez,rotor position estimation,rotor slot,rotor slot harmonics,rotor slot number,spectral analysis,speed estimation},\nmendeley-tags = {master tez,rotor slot},\npages = {27},\npublisher = {World Intellectual Property Organization},\ntitle = {{Speed and Rotor Position Estimation of Electrical Machines Using Rotor Slot Harmonics and Higher Order Rotor Slot Harmonics}},\nyear = {2011}\n}\n
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\n The present invention is a method and a system developed for speed and rotor position estimation of electrical machines. In this invention, rotor slot harmonics are detected either from the motor current or voltage or voltage induced on an external search coil or by similar means. The excitation frequency component of the signal used is eliminated; rotor slot harmonics are extracted from the resulting signal via demodulation. Rotor speed and position is obtained by processing the rotor slot harmonic variation in real time; and this process does not employ any spectral analysis technique.\n
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\n \n\n \n \n Keysan, O.; McDonald, A.; and Mueller, M.\n\n\n \n \n \n \n \n A direct drive permanent magnet generator design for a tidal current turbine(SeaGen).\n \n \n \n \n\n\n \n\n\n\n In 2011 IEEE International Electric Machines & Drives Conference (IEMDC), pages 224–229, may 2011. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"APaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 4 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Keysan2011c,\nabstract = {In this study, the feasibility of a direct-drive per- manent magnet generator for a tidal turbine power take-off system, namely MCT's SeaGen –the world's first full scale commercial tidal turbine– has been investigated. The investigated PM generator topology is called C-GEN which is an air-cored axial-flux generator developed in the University of Edinburgh. The C-GEN is prior to conventional PM generators by absence of magnetic attraction forces between rotor and stator, absence of cogging torque, ease of manufacturing, modularity and high fault-toleration [1]. Firstly, the integrated analytical design tool that couples electromagnetic, structural and thermal aspects of the generator has been introduced. Then, an optimization tool based on genetic algorithm has been used to maximize the annual electricity generation and to minimize the initial cost of the generator. The optimized generator is validated using FEA tools and the specifications of the generator has been presented. I.},\nauthor = {Keysan, Ozan and McDonald, A.S. and Mueller, Markus},\nbooktitle = {2011 IEEE International Electric Machines & Drives Conference (IEMDC)},\ndoi = {10.1109/IEMDC.2011.5994850},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, McDonald, Mueller - 2011 - A direct drive permanent magnet generator design for a tidal current turbine(SeaGen).pdf:pdf},\nisbn = {978-1-4577-0060-6},\nkeywords = {Cgen,Direct drive,genetic algorithm optimization,integrated design,marine energy,permanent magnet generator,tidal energy},\nmendeley-tags = {Cgen,marine energy},\nmonth = {may},\npages = {224--229},\npublisher = {IEEE},\ntitle = {{A direct drive permanent magnet generator design for a tidal current turbine(SeaGen)}},\nurl = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5994850},\nyear = {2011}\n}\n
\n
\n\n\n
\n In this study, the feasibility of a direct-drive per- manent magnet generator for a tidal turbine power take-off system, namely MCT's SeaGen –the world's first full scale commercial tidal turbine– has been investigated. The investigated PM generator topology is called C-GEN which is an air-cored axial-flux generator developed in the University of Edinburgh. The C-GEN is prior to conventional PM generators by absence of magnetic attraction forces between rotor and stator, absence of cogging torque, ease of manufacturing, modularity and high fault-toleration [1]. Firstly, the integrated analytical design tool that couples electromagnetic, structural and thermal aspects of the generator has been introduced. Then, an optimization tool based on genetic algorithm has been used to maximize the annual electricity generation and to minimize the initial cost of the generator. The optimized generator is validated using FEA tools and the specifications of the generator has been presented. I.\n
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\n  \n 2010\n \n \n (6)\n \n \n
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\n \n\n \n \n Keysan, O.; and Bulent Ertan, H.\n\n\n \n \n \n \n \n Speed & position estimation by demodulating rotor slot harmonics.\n \n \n \n \n\n\n \n\n\n\n In The XIX International Conference on Electrical Machines - ICEM 2010, pages 1–6, sep 2010. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"SpeedPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Keysan2010c,\nabstract = {It is well known that slotting harmonics exist in most of the electrical machines. These harmonics may supply valuable information for condition monitoring of bearings, windings or rotor bars. Utilization of these harmonics for rotor speed and position estimation is limited mainly due to long sampling periods required by spectral estimation techniques. In this study, a novel speed and position estimation method is proposed that does not need any kind of spectral estimation. In this approach extracting the required information can be done within a typical control cycle of a vector controlled drive algorithm. In the application of the method, higher order rotor slot harmonics have been utilized. The approach is explained in the paper and illustrated with experimental results.},\nauthor = {Keysan, Ozan and {Bulent Ertan}, H.},\nbooktitle = {The XIX International Conference on Electrical Machines - ICEM 2010},\ndoi = {10.1109/ICELMACH.2010.5607856},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Bulent Ertan - 2010 - Speed & position estimation by demodulating rotor slot harmonics.pdf:pdf},\nisbn = {978-1-4244-4174-7},\nkeywords = {demodulation,higher order rotor slot harmonics,induction machine,master tez,rotor position estimation,rotor slot harmonics,rotor slot number,search coil,spectral analysis,velocity estimation},\nmendeley-tags = {master tez},\nmonth = {sep},\nnumber = {3},\npages = {1--6},\npublisher = {IEEE},\ntitle = {{Speed & position estimation by demodulating rotor slot harmonics}},\nurl = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5607856},\nyear = {2010}\n}\n
\n
\n\n\n
\n It is well known that slotting harmonics exist in most of the electrical machines. These harmonics may supply valuable information for condition monitoring of bearings, windings or rotor bars. Utilization of these harmonics for rotor speed and position estimation is limited mainly due to long sampling periods required by spectral estimation techniques. In this study, a novel speed and position estimation method is proposed that does not need any kind of spectral estimation. In this approach extracting the required information can be done within a typical control cycle of a vector controlled drive algorithm. In the application of the method, higher order rotor slot harmonics have been utilized. The approach is explained in the paper and illustrated with experimental results.\n
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\n \n\n \n \n Keysan, O.; Mueller, M.; Doherty, R.; Hamilton, M.; and McDonald, A.\n\n\n \n \n \n \n \n C-GEN, a lightweight direct drive generator for marine energy converters.\n \n \n \n \n\n\n \n\n\n\n In 5th IET International Conference on Power Electronics, Machines and Drives (PEMD 2010), pages 244–244, 2010. Institution of Engineering and Technology\n \n\n\n\n
\n\n\n\n \n \n \"C-GEN,Paper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Keysan2010a,\nabstract = {C-GEN is a new topology of direct-drive permanent magnet generator being developed at University of Edinburgh. The main benefits are reduced overall system mass and ease of manufacturing, due to the use of an air-cored winding, but with a modular PM rotor consisting of C-core modules. A 15kW rotary prototype has been fitted and tested on a commercially available wind turbine. Initial sizing studies for wind indicate that the C-GEN concept will be up to 50% lighter than conventional iron cored PM direct drive generators [10]. In addition to wind the C-GEN has applications in marine energy converters. The authors are working with four marine developers to investigate the feasibility of C-GEN for their technology. The results from two of those studies will be presented in this paper namely; Aquamarine Oyster device – near shore wave energy converter, Scotrenewables SRTT device – tidal current energy converter. In order to find the most optimum solution for the specific application; electromagnetic, thermal, structural and economical design aspects of the generator are defined and coupled using an analytical design tool. To evaluate different design variations an optimization tool is developed based on genetic algorithm. All these considerations make the optimised generator design a very close optimum solution for the “real-world”.},\nannote = {dokuman detaylarini duzenle},\nauthor = {Keysan, Ozan and Mueller, Markus and Doherty, R. and Hamilton, M. and McDonald, A.S.},\nbooktitle = {5th IET International Conference on Power Electronics, Machines and Drives (PEMD 2010)},\ndoi = {10.1049/cp.2010.0021},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan et al. - 2010 - C-GEN, a lightweight direct drive generator for marine energy converters(3).pdf:pdf},\nisbn = {978 1 84919 231 6},\nkeywords = {Cgen,aquamarine,direct drive,genetic algorithm,genetic algorithm optimization,npower,permanent magnet generator,tidal current energy,tidal power,tidal turbine,wave energy,wave energy converter},\nmendeley-tags = {Cgen,npower},\npages = {244--244},\npublisher = {Institution of Engineering and Technology},\ntitle = {{C-GEN, a lightweight direct drive generator for marine energy converters}},\nurl = {http://digital-library.theiet.org/content/conferences/10.1049/cp.2010.0021},\nyear = {2010}\n}\n
\n
\n\n\n
\n C-GEN is a new topology of direct-drive permanent magnet generator being developed at University of Edinburgh. The main benefits are reduced overall system mass and ease of manufacturing, due to the use of an air-cored winding, but with a modular PM rotor consisting of C-core modules. A 15kW rotary prototype has been fitted and tested on a commercially available wind turbine. Initial sizing studies for wind indicate that the C-GEN concept will be up to 50% lighter than conventional iron cored PM direct drive generators [10]. In addition to wind the C-GEN has applications in marine energy converters. The authors are working with four marine developers to investigate the feasibility of C-GEN for their technology. The results from two of those studies will be presented in this paper namely; Aquamarine Oyster device – near shore wave energy converter, Scotrenewables SRTT device – tidal current energy converter. In order to find the most optimum solution for the specific application; electromagnetic, thermal, structural and economical design aspects of the generator are defined and coupled using an analytical design tool. To evaluate different design variations an optimization tool is developed based on genetic algorithm. All these considerations make the optimised generator design a very close optimum solution for the “real-world”.\n
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\n \n\n \n \n Hodgins, N.; Keysan, O.; McDonald, A.; and Mueller, M.\n\n\n \n \n \n \n \n Linear generator for direct drive wave energy applications.\n \n \n \n \n\n\n \n\n\n\n In The XIX International Conference on Electrical Machines - ICEM 2010, pages 1–6, sep 2010. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"LinearPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 3 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Hodgins2010,\nabstract = {A 50kW linear permanent magnet generator has been designed and built. The main significance of the generator topology is that the relative position of the magnets, copper and steel has been chosen so that there are no magnetic attraction forces between the stator and permanent magnet translator. The magnetic force between magnets is reacted within a self supporting structure. The lack of magnetic forces and the modular nature of the generator topology makes the manufacture and assembly of the generator easier than a conventional iron-cored permanent magnet generator. Modeling techniques used to design the generator topology are described and photos are presented to demonstrate the benefits of the topology in terms of manufacture and assembly.},\nauthor = {Hodgins, Neil and Keysan, Ozan and McDonald, A.S. and Mueller, Markus},\nbooktitle = {The XIX International Conference on Electrical Machines - ICEM 2010},\ndoi = {10.1109/ICELMACH.2010.5607840},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Hodgins et al. - 2010 - Linear generator for direct drive wave energy applications(3).pdf:pdf},\nisbn = {978-1-4244-4174-7},\nkeywords = {Cgen,air-cored,direct-drive generator,linear,linear electrical machines,linear generator,linear permanent magnet,marine energy,marine power,wave energy,wave energy converter},\nmendeley-tags = {Cgen,linear},\nmonth = {sep},\npages = {1--6},\npublisher = {IEEE},\ntitle = {{Linear generator for direct drive wave energy applications}},\nurl = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5607840},\nyear = {2010}\n}\n
\n
\n\n\n
\n A 50kW linear permanent magnet generator has been designed and built. The main significance of the generator topology is that the relative position of the magnets, copper and steel has been chosen so that there are no magnetic attraction forces between the stator and permanent magnet translator. The magnetic force between magnets is reacted within a self supporting structure. The lack of magnetic forces and the modular nature of the generator topology makes the manufacture and assembly of the generator easier than a conventional iron-cored permanent magnet generator. Modeling techniques used to design the generator topology are described and photos are presented to demonstrate the benefits of the topology in terms of manufacture and assembly.\n
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\n \n\n \n \n Keysan, O.; and Bulent Ertan, H.\n\n\n \n \n \n \n \n Higher order rotor slot harmonics for rotor speed & position estimation.\n \n \n \n \n\n\n \n\n\n\n In 2010 12th International Conference on Optimization of Electrical and Electronic Equipment, pages 416–421, Brasov, may 2010. IEEE\n \n\n\n\n
\n\n\n\n \n \n \"HigherPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
\n
@inproceedings{Keysan2010,\nabstract = {Air-gap flux of all electrical machines contains harmonics. Some of these harmonics stem from rotor slotting of the machine. These harmonics can be utilized for control or diagnostic purposes. In the literature, rotor slot harmonics are mostly utilized for condition monitoring. There is also some research utilizing them for rotor speed estimation. However, it is observed that in the existing work spectral analysis techniques are employed which require long samples of data and in this from they are not suitable for vector control of induction motors. Accurate position information is vital for high performance vector control of induction motors. Furthermore using a sensor which requires some kind of modification on the motor is not desirable. A novel method has been proposed in this study that does not need any spectral estimation techniques. In this approach extracting the required information can be done within a typical control cycle of a vector controlled drive algorithm. Furthermore, any modification of the motor is not necessary. In this paper the proposed approach is presented. Experimental results illustrate that the position prediction accuracy of the approach is very high.},\naddress = {Brasov},\nauthor = {Keysan, Ozan and {Bulent Ertan}, H.},\nbooktitle = {2010 12th International Conference on Optimization of Electrical and Electronic Equipment},\ndoi = {10.1109/OPTIM.2010.5510487},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Bulent Ertan - 2010 - Higher order rotor slot harmonics for rotor speed & position estimation.pdf:pdf},\nisbn = {978-1-4244-7019-8},\nkeywords = {demodulation,higher order rotor slot harmonics,induction machine,master tez,rotor position estimation,rotor slot harmonics,rotor slot number,search coil,spectral analysis,velocity estimation},\nmendeley-tags = {master tez},\nmonth = {may},\npages = {416--421},\npublisher = {IEEE},\ntitle = {{Higher order rotor slot harmonics for rotor speed & position estimation}},\nurl = {http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5510487},\nyear = {2010}\n}\n
\n
\n\n\n
\n Air-gap flux of all electrical machines contains harmonics. Some of these harmonics stem from rotor slotting of the machine. These harmonics can be utilized for control or diagnostic purposes. In the literature, rotor slot harmonics are mostly utilized for condition monitoring. There is also some research utilizing them for rotor speed estimation. However, it is observed that in the existing work spectral analysis techniques are employed which require long samples of data and in this from they are not suitable for vector control of induction motors. Accurate position information is vital for high performance vector control of induction motors. Furthermore using a sensor which requires some kind of modification on the motor is not desirable. A novel method has been proposed in this study that does not need any spectral estimation techniques. In this approach extracting the required information can be done within a typical control cycle of a vector controlled drive algorithm. Furthermore, any modification of the motor is not necessary. In this paper the proposed approach is presented. Experimental results illustrate that the position prediction accuracy of the approach is very high.\n
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\n \n\n \n \n Keysan, O.\n\n\n \n \n \n \n Hayward Tyler, Marinisation of a Direct Drive Permanent Magnet Machine.\n \n \n \n\n\n \n\n\n\n Technical Report 2010.\n \n\n\n\n
\n\n\n\n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@techreport{Keysan2010e,\nauthor = {Keysan, Ozan},\npages = {1--30},\ntitle = {{Hayward Tyler, Marinisation of a Direct Drive Permanent Magnet Machine}},\nyear = {2010}\n}\n
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\n \n\n \n \n Keysan, O.; McDonald, A.; and Mueller, M.\n\n\n \n \n \n \n \n Integrated Design and Optimization of a Direct Drive Axial Flux Permanent Magnet Generator for a Tidal Turbine.\n \n \n \n \n\n\n \n\n\n\n In International Conference on Renewable Energies and Power Quality - ICREPQ'10, Granada, 2010. \n \n\n\n\n
\n\n\n\n \n \n \"IntegratedPaper\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Keysan2010b,\nabstract = {The C-GEN is a novel topology of direct drive air-core permanent magnet generator being developed at University of Edinburgh [1]. The topology has many benefits such as; absence of cogging torque, reduced mass and ease of manufacturing. A 20 kW prototype test rig and 15kW machine for a wind turbine has been manufactured and tested previously. Initial sizing studies for wind turbines indicate that the C-GEN concept will be up to 50% lighter than conventional iron cored PM direct drive generators [1]. In addition to the applications wind turbines, C-GEN technology can also be implemented for marine energy power take-off systems. To investigate that, a feasibility study is being undertaken in collaboration with two wave and two tidal energy companies. In this paper, design and optimization method of an axial flux permanent magnet generator for a tidal energy converter device has been investigated. An analytical optimization tool is designed that combines electromagnetic, structural and thermal aspects of the machine design. A genetic algorithm optimization method has been utilized based on the operation conditions of generator and pre-defined constraints on dimensions and material limitations. The output of the analytical design tool is compared with the electromagnetic FEA simulations. The results showed that proposed analytical calculation method is consistent with FEA results},\naddress = {Granada},\nauthor = {Keysan, Ozan and McDonald, A.S. and Mueller, Markus},\nbooktitle = {International Conference on Renewable Energies and Power Quality - ICREPQ'10},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, McDonald, Mueller - 2010 - Integrated Design and Optimization of a Direct Drive Axial Flux Permanent Magnet Generator for a T(3).pdf:pdf},\nkeywords = {design,direct drive,genetic algorithm optimization,integrated,permanent magnet generator,tidal current energy,tidal energy,tidal turbine},\ntitle = {{Integrated Design and Optimization of a Direct Drive Axial Flux Permanent Magnet Generator for a Tidal Turbine}},\nurl = {http://icrepq.com/icrepq%2710/649-Keysan.pdf},\nyear = {2010}\n}\n
\n
\n\n\n
\n The C-GEN is a novel topology of direct drive air-core permanent magnet generator being developed at University of Edinburgh [1]. The topology has many benefits such as; absence of cogging torque, reduced mass and ease of manufacturing. A 20 kW prototype test rig and 15kW machine for a wind turbine has been manufactured and tested previously. Initial sizing studies for wind turbines indicate that the C-GEN concept will be up to 50% lighter than conventional iron cored PM direct drive generators [1]. In addition to the applications wind turbines, C-GEN technology can also be implemented for marine energy power take-off systems. To investigate that, a feasibility study is being undertaken in collaboration with two wave and two tidal energy companies. In this paper, design and optimization method of an axial flux permanent magnet generator for a tidal energy converter device has been investigated. An analytical optimization tool is designed that combines electromagnetic, structural and thermal aspects of the machine design. A genetic algorithm optimization method has been utilized based on the operation conditions of generator and pre-defined constraints on dimensions and material limitations. The output of the analytical design tool is compared with the electromagnetic FEA simulations. The results showed that proposed analytical calculation method is consistent with FEA results\n
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\n  \n 2009\n \n \n (8)\n \n \n
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\n \n\n \n \n Keysan, O.\n\n\n \n \n \n \n Archimedes Wave Swing, C-Gen Direct Drive Linear Machine Design.\n \n \n \n\n\n \n\n\n\n Technical Report 2009.\n \n\n\n\n
\n\n\n\n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n\n \n  \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n\n\n\n
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@techreport{Keysan2009f,\nauthor = {Keysan, Ozan},\npages = {1--28},\ntitle = {{Archimedes Wave Swing, C-Gen Direct Drive Linear Machine Design}},\nyear = {2009}\n}\n
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\n \n\n \n \n Keysan, O.; and Ertan, B.\n\n\n \n \n \n \n \n Determination of rotor slot number of an induction motor using an external search coil.\n \n \n \n \n\n\n \n\n\n\n Facta universitatis - series: Electronics and Energetics, 22(2): 227–234. 2009.\n \n\n\n\n
\n\n\n\n \n \n \"DeterminationPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 34 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
\n
@article{Keysan2009,\nabstract = {This paper describes determination of the number rotor slots of an induction motor from the induced emf in an external search coil. This information is needed in prediction of motor speed from the external search coil induced voltage. The approach is based on identifying saliency harmonics and rotor slot harmonics, via FFT analysis of the external search coil emf. The proposed approach is tested on an induction motor driven by the mains supply. The experiments are repeated with a PWM supply. It is shown that the method works well in both cases and the number of rotor slots of the test machine is accurately predicted.},\nauthor = {Keysan, Ozan and Ertan, B{\\"{u}}lent},\ndoi = {10.2298/FUEE0902227K},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Ertan - 2009 - Determination of rotor slot number of an induction motor using an external search coil.pdf:pdf},\nissn = {0353-3670},\njournal = {Facta universitatis - series: Electronics and Energetics},\nkeywords = {higher order rotor slot harmonics,induction machine,induction motor,master tez,parameter prediction,rotor position estimation,rotor slot,rotor slot harmonics,spectral analysis},\nmendeley-tags = {master tez,rotor slot},\nnumber = {2},\npages = {227--234},\npublisher = {University of Ni{\\v{s}}},\ntitle = {{Determination of rotor slot number of an induction motor using an external search coil}},\nurl = {http://www.doiserbia.nb.rs/Article.aspx?ID=0353-36700902227K},\nvolume = {22},\nyear = {2009}\n}\n
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\n This paper describes determination of the number rotor slots of an induction motor from the induced emf in an external search coil. This information is needed in prediction of motor speed from the external search coil induced voltage. The approach is based on identifying saliency harmonics and rotor slot harmonics, via FFT analysis of the external search coil emf. The proposed approach is tested on an induction motor driven by the mains supply. The experiments are repeated with a PWM supply. It is shown that the method works well in both cases and the number of rotor slots of the test machine is accurately predicted.\n
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\n \n\n \n \n Ertan, H. B.; and Keysan, O.\n\n\n \n \n \n \n \n Determination of rotor slot number of an induction motor using an external search coil.\n \n \n \n \n\n\n \n\n\n\n In International Symposium on Electrical Apparatus and Technologie - SIELA 2009, volume 22, pages 1–6, 2009. University of Niš\n \n\n\n\n
\n\n\n\n \n \n \"DeterminationPaper\n  \n \n\n \n \n doi\n  \n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 4 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Keysan2009b,\nabstract = {The study in this paper investigates whether the air gap harmonics can be identified by using an external search coil placed on the frame of an induction motor. For this purpose the study focuses on the prediction of rotor speed of an induction motor from external search coil emf, using spectral analysis techniques. In the first stage of the study the type of search coil which maximizes the induced emf is sought, also the position of the coil on the induced emf is investigated. Several motors are tested with a sinusoidal supply as well as a PWM inverter power supply and the search coil voltage is sampled. FFT analysis of the recorded data is performed in Matlab environment. An algorithm is developed for identifying the rotor speed using the FFT analysis results. It is shown that the developed algorithm is capable of predicting the motor speed under various load conditions and motor speeds. The speed estimation accuracy of this approach is also discussed. In short, this paper illustrates that the induced emf in an external search coil contains information on air gap harmonics, and these harmonics can be identified even when the motors are supplied with a PWM inverter.},\nauthor = {Ertan, H. B. and Keysan, Ozan},\nbooktitle = {International Symposium on Electrical Apparatus and Technologie - SIELA 2009},\ndoi = {10.1109/ELECTROMOTION.2009.5259143},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan, Ertan - 2009 - Determination of rotor slot number of an induction motor using an external search coil.pdf:pdf;:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Ertan, Keysan - 2009 - Determination of rotor slot number of an induction motor using an external search coil.pdf:pdf},\nisbn = {978-1-4244-5150-0},\nkeywords = {demodulation,external search coil,higher order rotor slot harmonics,induction machine,induction motor,master tez,parameter prediction,rotor position estimation,rotor slot,rotor slot harmonics,rotor slot number,search coil,spectral analysis},\nmendeley-tags = {master tez,rotor slot,search coil},\nnumber = {2},\npages = {1--6},\npublisher = {University of Ni{\\v{s}}},\ntitle = {{Determination of rotor slot number of an induction motor using an external search coil}},\nurl = {http://factaee.elfak.ni.ac.rs/fu2k92/8ertan.pdf http://scholar.google.com/scholar?hl=en&btnG=Search&q=intitle:Determination+of+Rotor+Slot+Number+of+an+Induction+Motor+Using+an+External+Search+Coil#0 http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=5259143},\nvolume = {22},\nyear = {2009}\n}\n
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\n The study in this paper investigates whether the air gap harmonics can be identified by using an external search coil placed on the frame of an induction motor. For this purpose the study focuses on the prediction of rotor speed of an induction motor from external search coil emf, using spectral analysis techniques. In the first stage of the study the type of search coil which maximizes the induced emf is sought, also the position of the coil on the induced emf is investigated. Several motors are tested with a sinusoidal supply as well as a PWM inverter power supply and the search coil voltage is sampled. FFT analysis of the recorded data is performed in Matlab environment. An algorithm is developed for identifying the rotor speed using the FFT analysis results. It is shown that the developed algorithm is capable of predicting the motor speed under various load conditions and motor speeds. The speed estimation accuracy of this approach is also discussed. In short, this paper illustrates that the induced emf in an external search coil contains information on air gap harmonics, and these harmonics can be identified even when the motors are supplied with a PWM inverter.\n
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\n \n\n \n \n Keysan, O.\n\n\n \n \n \n \n Aquamarine Power, Oyster C-Gen Rotary Machine Design.\n \n \n \n\n\n \n\n\n\n Technical Report 2009.\n \n\n\n\n
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@techreport{Keysan2009e,\nauthor = {Keysan, Ozan},\npages = {1--45},\ntitle = {{Aquamarine Power, Oyster C-Gen Rotary Machine Design}},\nyear = {2009}\n}\n
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\n \n\n \n \n Keysan, O.\n\n\n \n \n \n \n Scotrenewables, Tidal Turbine C-Gen Direct Drive Machine Design.\n \n \n \n\n\n \n\n\n\n Technical Report 2009.\n \n\n\n\n
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@techreport{Keysan2009h,\nauthor = {Keysan, Ozan},\npages = {1--48},\ntitle = {{Scotrenewables, Tidal Turbine C-Gen Direct Drive Machine Design}},\nyear = {2009}\n}\n
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\n \n\n \n \n Keysan, O.\n\n\n \n \n \n \n Marine Current Turbines, C-Gen Direct Drive Machine Design.\n \n \n \n\n\n \n\n\n\n Technical Report 2009.\n \n\n\n\n
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@techreport{Keysan2009g,\nauthor = {Keysan, Ozan},\npages = {1--31},\ntitle = {{Marine Current Turbines, C-Gen Direct Drive Machine Design}},\nyear = {2009}\n}\n
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\n \n\n \n \n Hodgins, N.; McDonald, A.; Shek, J.; Keysan, O.; and Mueller, M.\n\n\n \n \n \n \n \n Current and Future Developments of the C-GEN Lightweight Direct Drive Generator for Wave & Tidal Energy.\n \n \n \n \n\n\n \n\n\n\n In Proceedings of the 8th European Wave and Tidal Energy Conference, Uppsala, 2009. \n \n\n\n\n
\n\n\n\n \n \n \"CurrentPaper\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 3 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@inproceedings{Hodgins2009,\nabstract = {The C-GEN is a novel permanent magnet generator aimed at reducing overall system mass in direct drive power takeoff applications. The design of a C-GEN generator requires the combination of electromagnetic, structural and thermal models. Two rotary prototypes of 15 & 20kW have been constructed and tested and the 15kW prototype has been fitted to a wind turbine. A 1kW linear generator has been tested and is being modified for flooded operation meanwhile a larger 50kW prototype is being designed. A feasibility study of C-GEN technology in four different wave and tidal projects is being undertaken.},\naddress = {Uppsala},\nauthor = {Hodgins, Neil and McDonald, A.S. and Shek, J. and Keysan, Ozan and Mueller, Markus},\nbooktitle = {Proceedings of the 8th European Wave and Tidal Energy Conference},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Hodgins et al. - 2009 - Current and Future Developments of the C-GEN Lightweight Direct Drive Generator for Wave & Tidal Energy(3).pdf:pdf},\nkeywords = {Cgen,direct drive,electromagnetic design,linear,linear electrical machines,linear generator,linear permanent magnet,marine energy,npower,power takeoff,wave energy,wave energy converter},\nmendeley-tags = {Cgen,linear,npower},\ntitle = {{Current and Future Developments of the C-GEN Lightweight Direct Drive Generator for Wave & Tidal Energy}},\nurl = {http://www.ewtec2009.se/Document/abstracts/195.pdf},\nyear = {2009}\n}\n
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\n The C-GEN is a novel permanent magnet generator aimed at reducing overall system mass in direct drive power takeoff applications. The design of a C-GEN generator requires the combination of electromagnetic, structural and thermal models. Two rotary prototypes of 15 & 20kW have been constructed and tested and the 15kW prototype has been fitted to a wind turbine. A 1kW linear generator has been tested and is being modified for flooded operation meanwhile a larger 50kW prototype is being designed. A feasibility study of C-GEN technology in four different wave and tidal projects is being undertaken.\n
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\n \n\n \n \n Ertan, H. B.; and Keysan, O.\n\n\n \n \n \n \n \n Govde disina yerlestirilmis bobin ile asenkron motor hizinin olculmesi.\n \n \n \n \n\n\n \n\n\n\n In Elektrik-Elektronik, Bilgisayar, Biyomedikal Mühendisliği 13. Ulusal Kongresi, volume 2, pages 37–43, 2009. \n \n\n\n\n
\n\n\n\n \n \n \"GovdePaper\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n\n\n\n
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@inproceedings{Ertan2009a,\nabstract = {Bu makaledeki {\\c{c}}alışma, motor g{\\"{o}}vdesi {\\"{u}}zerine yerleştirilmiş bir bobin ile hava aralığındaki harmoniklerin tanımlanması imkanını incelemektedir. Bu ama{\\c{c}}la {\\c{c}}alışma g{\\"{o}}vde dışına yerleştirilmiş bir bobinde end{\\"{u}}klenen gerilimden spectrum analiz y{\\"{o}}ntemini kullanarak motor hızının belirlenmesi {\\"{u}}zerine odaklanmıştır. {\\c{C}}alışmanın ilk basamağında, bobinde end{\\"{u}}klenen gerilimin en{\\c{c}}oklanması i{\\c{c}}in, bobin tiplerinin ve bobinin g{\\"{o}}vdeye nasıl yerleştirilmesinin uygun olacağı {\\"{u}}zerinde durulmuştur. Bir ka{\\c{c}} motor, sinusoidal gerilim ve PWM evirge{\\c{c}} ile s{\\"{u}}r{\\"{u}}lerek test edilmiş ve bobin voltajı {\\"{o}}rneklenerek kaydedilmiştir. Kaydedilen bilgi MATLAB ortamında FFT analizi yapılarak incelenmiştir. FFT analiz sonu{\\c{c}}larından motor hızını belirlemek i{\\c{c}}in bir algoritma geliştirilmiştir. Bu algoritmanın, değişik motor y{\\"{u}}klerinde ve s{\\"{u}}rme frekanslarında motor hızını doğru olarak belirleyebildiği g{\\"{o}}sterilmiştir. Y{\\"{o}}ntemin hızı belirleme hassasiyeti de tartışılmıştır. Kısaca {\\"{o}}zetlemek gerekirse, bu bildiri g{\\"{o}}vde dışına yerleştirilmiş bir bobinde end{\\"{u}}klenen gerilimin hava aralığı harmonikleri bilgisinin i{\\c{c}}erdiği ve bu bilginin motor PWM s{\\"{u}}r{\\"{u}}c{\\"{u}} ile s{\\"{u}}r{\\"{u}}lse bile elde edilebildiğini g{\\"{o}}stermiştir.},\nauthor = {Ertan, H. B. and Keysan, Ozan},\nbooktitle = {Elektrik-Elektronik, Bilgisayar, Biyomedikal M{\\"{u}}hendisliği 13. Ulusal Kongresi},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Ertan, Keysan - 2009 - Govde disina yerlestirilmis bobin ile asenkron motor hizinin olculmesi.pdf:pdf},\nkeywords = {master tez},\nmendeley-tags = {master tez},\nnumber = {3},\npages = {37--43},\ntitle = {{Govde disina yerlestirilmis bobin ile asenkron motor hizinin olculmesi}},\nurl = {http://bilimseldergi.emo.org.tr/dergi_goster.php?kodu=882&dergi=15},\nvolume = {2},\nyear = {2009}\n}\n
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\n Bu makaledeki çalışma, motor gövdesi üzerine yerleştirilmiş bir bobin ile hava aralığındaki harmoniklerin tanımlanması imkanını incelemektedir. Bu amaçla çalışma gövde dışına yerleştirilmiş bir bobinde endüklenen gerilimden spectrum analiz yöntemini kullanarak motor hızının belirlenmesi üzerine odaklanmıştır. Çalışmanın ilk basamağında, bobinde endüklenen gerilimin ençoklanması için, bobin tiplerinin ve bobinin gövdeye nasıl yerleştirilmesinin uygun olacağı üzerinde durulmuştur. Bir kaç motor, sinusoidal gerilim ve PWM evirgeç ile sürülerek test edilmiş ve bobin voltajı örneklenerek kaydedilmiştir. Kaydedilen bilgi MATLAB ortamında FFT analizi yapılarak incelenmiştir. FFT analiz sonuçlarından motor hızını belirlemek için bir algoritma geliştirilmiştir. Bu algoritmanın, değişik motor yüklerinde ve sürme frekanslarında motor hızını doğru olarak belirleyebildiği gösterilmiştir. Yöntemin hızı belirleme hassasiyeti de tartışılmıştır. Kısaca özetlemek gerekirse, bu bildiri gövde dışına yerleştirilmiş bir bobinde endüklenen gerilimin hava aralığı harmonikleri bilgisinin içerdiği ve bu bilginin motor PWM sürücü ile sürülse bile elde edilebildiğini göstermiştir.\n
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\n \n\n \n \n Keysan, O.\n\n\n \n \n \n \n \n A Non-Invasive Speed and Position Sensor for Induction Machines Using External Search Coils.\n \n \n \n \n\n\n \n\n\n\n Ph.D. Thesis, Middle East Technical University, 2008.\n \n\n\n\n
\n\n\n\n \n \n \"APaper\n  \n \n\n \n\n \n link\n  \n \n\n bibtex\n \n\n \n  \n \n abstract \n \n\n \n  \n \n 58 downloads\n \n \n\n \n \n \n \n \n \n \n\n  \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n
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@phdthesis{Keysan2008a,\nabstract = {In industrial drives market, speed and position estimation is one of the most important subjects for accurate motor drives. Vector controlled drives has the best dynamic performance among AC motor drives. Sensorless vector control is one of the most studied one. However, sensorless drive systems fail at low or zero speeds and may not have enough accuracy. For better accuracy and speed range speed sensors or position encoders are usually essential. However, coupling of sensor and sensor prices introduces extra cost on the drive. Thus in order to reduce the cost of the drive a cheap and easy to mount speed sensors is essential. Throughout out this study, a speed and position sensor using an external search coil placed between cooling fins on the frame of an induction machine is proposed. The search coil utilizes the fringing flux outside the frame of induction motor. Using the induced voltage on the external search coil, a new method that estimates the flux and rotor position is proposed. In this study, the induced voltage on the search coils are investigated with different types of search coils placed on various positions. And the frequency domain and time domain analysis are performed in order to build a model that can estimate machine flux, rotor speed and rotor position. As a result of this study, a low cost, easy to mount speed and position sensor is designed and implemented. Experiment results are presented.},\nauthor = {Keysan, Ozan},\nfile = {:home/ozi/.local/share/data/Mendeley Ltd./Mendeley Desktop/Downloaded/Keysan - 2008 - A Non-Invasive Speed and Position Sensor for Induction Machines Using External Search Coils.pdf:pdf},\nkeywords = {Search coil,fringing flux v,harmonics,master tez,position estimation,rotor slot,speed estimation},\nmendeley-tags = {master tez},\nnumber = {December},\npages = {213},\nschool = {Middle East Technical University},\ntitle = {{A Non-Invasive Speed and Position Sensor for Induction Machines Using External Search Coils}},\ntype = {MSc},\nurl = {http://library.metu.edu.tr/search/a?SEARCH=keysan},\nyear = {2008}\n}\n
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\n In industrial drives market, speed and position estimation is one of the most important subjects for accurate motor drives. Vector controlled drives has the best dynamic performance among AC motor drives. Sensorless vector control is one of the most studied one. However, sensorless drive systems fail at low or zero speeds and may not have enough accuracy. For better accuracy and speed range speed sensors or position encoders are usually essential. However, coupling of sensor and sensor prices introduces extra cost on the drive. Thus in order to reduce the cost of the drive a cheap and easy to mount speed sensors is essential. Throughout out this study, a speed and position sensor using an external search coil placed between cooling fins on the frame of an induction machine is proposed. The search coil utilizes the fringing flux outside the frame of induction motor. Using the induced voltage on the external search coil, a new method that estimates the flux and rotor position is proposed. In this study, the induced voltage on the search coils are investigated with different types of search coils placed on various positions. And the frequency domain and time domain analysis are performed in order to build a model that can estimate machine flux, rotor speed and rotor position. As a result of this study, a low cost, easy to mount speed and position sensor is designed and implemented. Experiment results are presented.\n
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