Soft-switching topologies for switched reluctance motors in the application of electric vehicles

Two topologies of soft-switching for the switched reluctance motor (SRM) are proposed in this paper to reduce the switching loss and EMI in the chopping and commuting periods. The design circuit of the topologies are shown and the feature of the current or voltage of resonant elements are analyzed in theory and confirmed by simulation of Matlab/Simulink. Besides, the energy loss of the soft-switching circuit for the second topology is calculated and compared with the conventional one. The loss is computed under different rotating speeds to simulate electrical vehicle (EV) running under various speeds and the advantage of the proposed circuit is proved.