A New Nonlinear Analytical Model of the SRM With Included Multiphase Coupling

Normal operation of switched reluctance motor (SRM) includes periods of simultaneous conduction of more than one phase. During these periods, currents of consecutive phases overlap, thereby producing mutual coupling between them that affects motor performance. For accurate performance prediction it is necessary to take mutual coupling into account. This is done through the new nonlinear analytical model presented in this paper. It can be used for fast design and optimization of any SRM configuration and with different converter topologies and control algorithms. Starting from the simple nonlinear model, based on single phase considerations, a new model comprising multiphase excitation is introduced. The model development is illustrated through the examples of 6/4 and 8/6 SRM. Using developed model, main motor characteristics are obtained and then compared to the simple model in order to envisage the differences. The new model is then validated through finite element method simulations. Additionally, experimental verification is provided for 6/4 SRM.