关键词: 内置式永磁同步电机, 电磁-热双向耦合, 谐响应分析, 电磁噪声

Abstract: Permanent magnet synchronous motor ( PMSM) is recognized as core power components in the fields of industrial transmission, new energy equipment and high-end manufacturing. Vibration and noise are generated during the operation of PMSM. The fatigue damage of key structural components such as stator and bearings is accelerated by the vibration and noise,and human hearing is directly harmed by them. Motor noise is mainly composed of electromagnetic noise,mechanical noise and aerodynamic noise. Electromagnetic noise is considered as the core component of motor noise. A multiphysics coupling model with bidirectional thermal coupling is established in this study. The electromagnetic noise characteristics of V-type interior permanent magnet synchronous motor ( IPMSM) are investigated. Comparative analysis of electromagnetic excitation, vibration response and noise radiation is conducted through unidirectional and bidirectional coupling calculations. The research results show that the dynamic interaction between temperature and electromagnetic parameters can be considered by bidirectional thermal coupling. The electromagnetic force,vibration response and electromagnetic noise of the motor calculated by the bidirectional thermal coupling method are all lower than those obtained by the unidirectional coupling method. A theoretical foundation for the analysis of motor electromagnetic noise is laid by this study.

Key words: interior permanent magnet synchronous motor, electromagnetic-thermal bidirectional coupling, harmonic response analysis, electromagnetic noise