Design study and experimental analysis of wound field flux switching motor for HEV applications

This paper presents design study, optimization and performance analysis of wound field flux switching machine with non-rare-earth magnet for hybrid electric vehicle drive applications. The stator of proposed machine consists of iron core made of electromagnetic steels, armature coils and field excitation coils as the only field mmf source. The rotor is composed of only stack of iron and hence, it is robust and suitable for high speed operation. The design target is a machine with the maximum torque and power density, and the maximum speed more than 210Nm and 3.5kW/kg, and 20,000r/min, respectively, which competes with interior permanent magnet synchronous machine used in an existing hybrid electric vehicle. Deterministic optimization method is applied to design the proposed machine until the target performances are achieved. Some experimental studies using a prototype of the finally designed machine are demonstrated to validate the effectiveness of the proposed machine.