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\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
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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 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
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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 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
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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 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
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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 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
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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 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
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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 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
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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 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
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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 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
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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 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
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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 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
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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 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
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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 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
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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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