关键词: 电磁力, 永磁同步电机, 模态综合法, 电机振动

Abstract:

The permanent magnet synchronous motor(PMSM) used in electric vehicle was studied. The dynamic response characteristics of the motor were analyzed by combining theory and numerical method. Due to the electromagnetic force is the main factor affecting the vibration of the motor, the analytical model of the electromagnetic torque and the electromagnetic radial force were analyzed. The motor was divided into rotor substructure, stator substructure and bearing connection substructure. Modal synthesis method was used to establish the dynamic model of the motor under electromagnetic force. And the dynamic response of the system was obtained by numerical method. In order to validate the analysis results, finite element method was used to calculate the dynamic response of the system. The result showed a good consistency between the dynamical responses calculated by different methods. According to the modeling principle, the dynamic response of the stator under different parameters was analyzed. The principle of the parameters such as the length of the air gap and the coefficient of the polar arc was given.

Key words: electromagnetic force, permanent magnet synchronous motor(PMSM), modal synthesis method, motor vibration