Modal research of permanent magnet synchronous motor for electric vehicles

Aiming at the vibration and noise problems caused by the constant rise in speed of the permanent magnet synchronous motor (PMSM) of electric vehicles, the natural frequency of motor stator is first analysed using the lumped mass method. Simultaneously, a fast equivalent modelling approach of motor stator with winding as added mass and material anisotropy is proposed. The finite element model of PMSM is established based on the established equivalent stator model, and its natural frequency and vibration shape are investigated. Finally, the motor's modal test is carried out on the modal test platform. The results show that the difference between the natural frequency simulation and the test results is less than 3%, and that the vibration modal characteristics of each order are consistent. The feasibility and accuracy of the fast equivalent modelling method are verified, laying the groundwork for the following optimised design of PMSM vibration and noise.