Dual-Stator Doubly Salient Electromagnetic Motor Driving System Utilizing a Nine-Switch Converter

This paper proposes a novel nine-switch converter for the dual-stator doubly salient electromagnetic motor (DSDSEM) in the compact and high-reliable driving system with 25% reduction of active switches compared with the conventional dual converter. The operation principle and mathematics model of DSDSEM are introduced, and the constraint relations of nine-switch topology for DSDSEM are given on the basis of the characteristics analysis of a nine-switch converter, then the corresponding commutation principles are proposed. Simultaneously, the influence of the interactions between the coupled outputs of the nine-switch converter is analyzed emphatically in the phase current commutation procedure. Besides, the advanced angle control strategy combined with the nine-state control strategy is optimized to eliminate the side effects of the interactions for the nine-switch converter. Finally, the effectiveness and feasibility of the control strategy of the proposed driving system are verified by the simulation and experiment results.