Multi-Physics Coupling Analysis of Hybrid Stator Permanent Magnet Vernier Motor for Electric Vehicle Based on Halbach Array

In order to improve the output torque and power density of the in-wheel motor, a hybrid stator permanent magnet vernier motor (HSPMVM) is proposed based on the traditional single-tooth permanent magnet vernier motor (PMVM-I) and split-tooth permanent magnet vernier motor (PMVM-II). With the help of analytical method and finite element method, the three motors of PMVM-I, PMVM-II, and HSPMVM are compared and analyzed. It is proved that HSPMVM has higher output torque and lower torque ripple, and the amount of permanent magnet is also significantly reduced. In order to further improve the operating performance, the Halbach array is applied to the HSPMVM to form a new hybrid stator Halbach array permanent magnet vernier motor (HSHPMVM). The analysis results show that the HSHPMVM has a significant magnetic concentration effect, the torque is increased by 61.96%, and the torque ripple is reduced by 22.47%. The magneto-thermal two-way coupling analysis of HSHPMVM under rated conditions shows that the maximum temperature is 103.28°C, and the maximum temperature of permanent magnet is 71.295°C, which meets the requirements of normal operation of the motor. Finally, the temperature rise experiment was carried out by using the prototype to verify the accuracy of the magneto-thermal two-way coupling.