Comparison of different arrangement of magnets for the purpose of reducing magnet usage in designing an IPM motor for Electric Vehicles

Because of the excellent performance of IPM motor, it is widely used in Electric Vehicles. Meanwhile, due to the fluctuating price of rare earth raw material in recent years, the manufacturing cost of IPM motor is difficult to control. So, it is important to research on reducing magnet usage. The purpose of this paper is to compare three kinds of IPM motor with different rotor structures at the same time to improve the magnetic circuit by increasing the reluctance torque. As a result, the amount of expensive NdFeB magnet is substantially reduced by adopting a improved V-shape arrangement.