Design studies on high torque and high power density hybrid excitation flux switching synchronous motor for HEV applications

This paper presents design study of high torque and high power density hybrid excitation flux switching synchronous motor (HEFSSM) as a candidate for traction drives in hybrid electric vehicle (HEV). Firstly, the construction, the basic working principle and the design concept of the proposed HEFSSM are overviewed. Then, under some design restrictions and specifications for the target HEV applications, the initial drive performances of the proposed HEFSSM are evaluated based on 2D-FEA. As the initial motor fails to achieve the target performances, design parameters are set and treated by using deterministic design optimization approach. After several cycles of optimization, the proposed motor makes possible to obtain the target performances of 333Nm torque and 123kW power similar to that used in existing interior permanent magnet synchronous motor (IPMSM) for LEXUS RX400h.