Abstract:

The stator core and winding configurations in permanent magnet motors were complex. When performing finite element simulations of vibration and noise， failure to apply equivalent treatment would compromise the accuracy of the simulation calculations. This paper employed an inversion method， commencing with modal testing of stator components to extract the 2nd~4th order cylindrical mode under both pre- and post-winding assembly conditions. Leveraging experimental data， a high-fidelity simulation model of the stator core was developed to derive the equivalent mechanics parameters. With the validated stator core simulation model， two winding modeling approached equivalent mass method and equivalent model method were implemented. Simulation-to-test comparisons revealed significant discrepancies in the equivalent mass method. Finally， elastic modulus and Poisson's ratio for the winding equivalent model were inversely identified via modal test data. The equivalent model demonstrats less than 5% error in modal simulations.

Key words: permanent magnet motor, inversion method, modal analysis, equivalent modeling, equivalent mechanics parameter

摘要：

永磁电机的定子铁芯和绕组结构复杂，在进行振动噪声有限元仿真时，如果不进行等效处理，会影响振动噪声仿真计算精度。基于反演法，开展定子部件的模态试验，得到定子结构在绕组装配前后的2~4阶典型圆柱模态。根据试验结果，建立精确的定子铁芯仿真模型，获取定子铁芯的等效力学参数。在定子铁芯模型建立准确的基础上，对定子绕组采用等效质量与等效模型两种建模方法，通过仿真与试验的对比发现，绕组的等效质量建模方法误差较大。根据模态试验结果，反演得到定子绕组等效模型的弹性模量和泊松比，该等效模型模态仿真计算误差在5%以内。

关键词: 永磁电机, 反演法, 模态分析, 等效建模, 等效力学参数