转子分段斜极永磁同步电机电磁振动噪声研究

基近年来永磁同步电机(PMSM)以其高效、节能的优点被广泛应用于电动汽车行业。然而电机的高频噪声已成为限制PMSM发展的关键因素。鉴于此,建立了一种能够进行电磁噪声预测的多物理场仿真模型,验证了所建立的仿真模型在预测和评估电磁噪声方面的有效性。另外,提出了一种可影响电磁噪声的转子分段斜极模型,并详细研究了斜极角对电磁噪声的影响。通过研究对电磁噪声影响较大的低阶径向磁力的光谱特性,比较分析了有无转子分段斜极的永磁同步电动机的电磁噪声特性分布。实验结果表明:在不同的斜极角下径向力密度的光谱是不同的;在频率范围内有转子分段斜极电机的SPL高于无转子分段斜极电机的SPL;所构建的基于多物理场的仿真模型能够很好地预测电磁噪声。

Research on Electromagnetic Vibration and Noise of Permanent Magnet Synchronous Motor with Rotor Step Skewing

In recent years,permanent magnet synchronous motors(PMSM)have been widely used in the electric vehicle industry because of their high efficiency and energy saving.However,the high frequency noise of motors has become a key factor limiting the development of PMSM.Therefore,a multi-physics simulation model with capable of electromagnetic noise prediction was established,and the effectiveness of the established simulation model in predicting and evaluating electromagnetic noise was verified.In addition,a rotor step skewing model which can affect electromagnetic noise was proposed,and the influence of the skewing angle on electromagnetic noise was investigated in detail.By studying the spectral characteristics of the low-order radial magnetic force which has a great influence on electromagnetic noise,the distribution of electromagnetic noise characteristics for the PMSM with or without the rotor step skewing was compared and analyzed.The experimental results show that the spectra of radial force density are different under different oblique polar angles.The SPL of the rotor segmented slant pole motor in the frequency range is higher than the SPL of the rotorless stepped slant pole motor.The constructed multiphysics simulation model is a good predictor of electromagnetic noise.