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Physical modeling of electric machines for motor drive system simulation

This paper discusses the issues related to the physical modeling of electric machines. The concept of physical modeling is introduced through reviewing the assumptions made in ideal models. In addition to the FE models, a physical phase variable model is proposed. The inductances as well as flux linkages are calculated from nonlinear transient FE solutions. Simulink implementations of both FE model and the phase variable model are studied. A PM synchronous motor and a PM brushless motor are used as objects of this research. The physical models of them are built and applied to various motor drive simulation systems. The obtained results show the ability of physical modeling in obtaining accurate results at much more faster speed.