摘要：通过简要解析分析一款注塑机用48槽8极永磁同步电动机（PMSM）的电磁振动与噪声产生机理，针对转子永磁体磁场，采用扫描法优化主要参数（极弧系数、永磁体磁极厚度、永磁体磁极偏心距），并分析了不同参数变量对气隙磁场谐波畸变率的影响规律；利用优选的参数变量，对永磁体磁极优化前后的电机模型进行电磁力波与模态参数的有限元仿真分析，最终达到减振降噪的效果。结果表明：该方法削弱了径向电磁力波空间分布与时间分布的幅值，而且通过降低永磁体磁极质量，可以提升模态固有频率，避免共振现象的发生。该方法能有效地抑制振动与噪声，为此类电机电磁噪声的计算与分析奠定了基础。
关键词：永磁同步电动机；电磁振动与噪声；永磁体优化；电磁力波分析；模态分析

Abstract: The main parameters of a permanent magnet synchronous motor (PMSM) used in an injection molding machine (polar arc coefficient, permanent magnet pole thickness, and permanent magnet pole eccentricity) were optimized by scanning method for the magnetic field of the permanent magnet of the rotor, analyzing the influence law of various parameter variables to air gap magnetic field harmonic distortion rate; Using the optimal parameter variables and the finite element method, the electromagnetic force wave and modal parameters of the motor model before and after the permanent magnet pole optimization were simulated and analyzed. The results show that this method weakens the amplitude of the spatial distribution and time distribution of the radial electromagnetic force wave and reduces the permanent magnet pole mass can increase the modal natural frequency, avoiding the resonance phenomenon and suppress the noise effectively, which lays a foundation for the calculation and analysis of the electromagnetic noise of PMSM.
Key words: permanent magnet synchronous motor; electromagnetic vibration and noise; permanent magnet optimization; electromagnetic force wave analysis; modal analysis