Design and comparison of electrically excited double rotor flux switching motor drive systems for automotive applications

This paper presents a cost-effective driving system for automotive applications based on a double rotor electrically excited flux switching machine (FSM). Benefiting from a double rotor topology, this FSM can realize a drum winding design and thus winding ends are effectively shorten and the copper loss is mitigated. The machine structure, operation principle and design consideration are studied and further verified by time-stepping finite element method. Moreover, three topologies of drive circuit for the proposed FSM are introduced. By using electromagnetic-circuit coupling simulation, a comparison between three different three drive systems are performed, with focus on the system cost and overall electromagnetic performance, especially the effect of current control and torque ripple. A prototype is established and tested. Relevant experimental results verify the effectiveness of the proposed new FSM drive system.