An improved magnetic-geared permanent magnet in-wheel motor for electric vehicles

This paper introduces an improved magnetic-geared permanent magnet (MGPM) in-wheel motor with high power density and torque density for electric vehicles (EVs). Due to the integrating of the magnetic gear and omitting of the gear inner rotor, the motor can achieve the low speed direct driving and high speed compact designing requirements with even simple structure. The principle and optimized structure are described. A 750w optimized motor is designed and analyzed by finite element method. The simulation results validate that the MGPM in-wheel motor can be operated at low speed, high efficiency and high torque. It is suitable for direct-driving EVs.