A New Method for Coupling Finite Element Field Solutions with External Circuits and Kinematics. Bedrosian, G. IEEE Transactions on Magnetics, 29(2):1664–1668, IEEE, 1993.
doi  abstract   bibtex   
Advantages over previous methods are the preservation of the sparsity, symmetry, and positive-definiteness of the finite-element matrix, and the ability to model efficiently nonlinear circuits of arbitrary complexity. This method is applied to a simple example. The ability to model nonlinear circuits of arbitrary complexity lends itself to the analysis of switched reluctance motors and other electronically controlled devices that are not amenable to a traditional fundamental frequency analysis
@Article{         Bedrosian_1993aa,
  abstract      = {Advantages over previous methods are the preservation of the sparsity, symmetry, and positive-definiteness of the finite-element matrix, and the ability to model efficiently nonlinear circuits of arbitrary complexity. This method is applied to a simple example. The ability to model nonlinear circuits of arbitrary complexity lends itself to the analysis of switched reluctance motors and other electronically controlled devices that are not amenable to a traditional fundamental frequency analysis},
  author        = {Bedrosian, Gary},
  doi           = {10.1109/20.250726},
  file          = {Bedrosian_1993aa.pdf},
  issn          = {0018-9464},
  journal       = {IEEE Transactions on Magnetics},
  keywords      = {coupling,fem,field,physics},
  langid        = {english},
  number        = {2},
  pages         = {1664--1668},
  publisher     = {IEEE},
  title         = {A New Method for Coupling Finite Element Field Solutions with External Circuits and Kinematics},
  volume        = {29},
  year          = {1993},
  shortjournal  = {IEEE Trans. Magn.}
}

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