DefinePK

Abstract

Recently, the reduction or avoidance of permanent magnet (PM) usage in an electric motor has become significant research area due to high price of rare-earth materials. Under definite specifications and limitations of conventional interior permanent magnet synchronous (IPMS) motor in existing hybrid electric vehicle (HEV), the early performances of the recommended field excitation flux switching (FEFS) motor with no PM are evaluated based on 2-D Finite Element Analysis (FEA). Since the initial performances fail to acquire the target torque and power, design optimization based on deterministic approach of FEFS motor parameters is presented in this paper to attain the target performances. After a few cycles of design optimization, the enhanced FEFS motor has achieved the target power and torque of 41kW and 70Nm, respectively. In conclusion, the final design FEFS motor has the maximum power density of 1.75kW/kg which is approximately 49% more than power density in existing IPMS motor.