In this study, a multiphysics finite element method is proposed to predict and evaluate the electromagnetic vibration and noise of the permanent magnet synchronous motors. First, the expressions of radial electromagnetic force waves were derived based on the established mathematical models of airgap magnetic field using the analytical methods. Subsequently, the main circumferential spatial orders influencing electromagnetic noise were analyzed and discussed. Then, a multiphysics simulation model that consists of mechanical field, electromagnetic field, and acoustic field was established for the calculation of the electromagnetic radiation noise. Finally, the multiphysics simulation model developed for the electromagnetic vibration and noise prediction was validated by comparing the finite element analysis and experimental data. It is shown that, although the local differences exist, the results from the finite element calculation and test analysis have a good agreement on the analytical mechanism overall, both in amplitude and main orders. In addition, this paper has made a detailed analysis to the electromagnetic noise generation mechanism, which lays the basis for further study in predicting and suppressing the electromagnetic vibration and noise of the drive motors of pure electric vehicle.

中文翻译：

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永磁同步电机的振动声学预测与评价

在这项研究中，提出了一种多物理场有限元方法来预测和评估永磁同步电机的电磁振动和噪声。首先，基于建立的气隙磁场数学模型，利用解析方法推导出径向电磁力波的表达式。随后，对影响电磁噪声的主要圆周空间阶次进行了分析和讨论。然后，建立了由机械场、电磁场和声场组成的多物理场仿真模型，用于计算电磁辐射噪声。最后，通过比较有限元分析和实验数据，验证了为电磁振动和噪声预测开发的多物理场仿真模型。结果表明，尽管存在局部差异，但有限元计算和测试分析的结果在振幅和主阶次上与整体分析机制具有良好的一致性。此外，本文对电磁噪声的产生机理进行了详细分析，为进一步研究纯电动汽车驱动电机电磁振动噪声的预测和抑制奠定了基础。