The electromagnetic vibration and noise level of ultra-high-speed bearingless permanent magnet synchronous motor (UBPMSM) for air compressors used in the fuel-cell vehicle (FCV) is an important evaluation. A 10 kW, 100 k r/min UBPMSM is adopted as the object of study in this research. The expression of radial electromagnetic force of UBPMSM is derived through theoretical analysis, and the order and frequency characteristics of radial electromagnetic force harmonics are summarized. Through the two-dimensional (2D) Fourier decomposition of radial electromagnetic force by finite element analysis (FEA), the main sources of radial electromagnetic force causing the electromagnetic vibration and noise are studied. The correctness of the mathematical model is verified by FEA. In addition, the three-dimensional (3D) finite element model of the motor is established to calculate the radial modal, natural frequency, and electromagnetic vibration and noise of UBPMSM. The research shows that the spatial order of radial electromagnetic force of UBPMSM is kN and kN ± 1 (N = GCD [2p, Z], k = 1, 2, 3, …), and the noise change of UBPMSM caused by the addition of suspension windings could be ignored compared with ordinary motor. It provides reference values for the design and optimization of UBPMSM. © 2022 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

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悬置绕组对空压机用超高速无轴承永磁同步电机电磁振动及噪声影响的研究

用于燃料电池汽车（FCV）的空压机用超高速无轴承永磁同步电机（UBPMSM）的电磁振动和噪声水平是一项重要的评估。本研究采用10 kW、100 k r/min UBPMSM作为研究对象。通过理论分析推导了UBPMSM径向电磁力的表达式，总结了径向电磁力谐波的阶次和频率特性。通过有限元分析（FEA）对径向电磁力进行二维（2D）傅立叶分解，研究了引起电磁振动和噪声的径向电磁力的主要来源。通过有限元分析验证了数学模型的正确性。此外，建立了电机的三维(3D)有限元模型，计算了UBPMSM的径向模态、固有频率以及电磁振动和噪声。研究表明，UBPMSM径向电磁力的空间阶数为k N 和k N ± 1 ( N  = GCD [2p, Z], k  = 1, 2, 3, …)，与普通电机相比，UBPMSM因增加悬浮绕组而引起的噪声变化可以忽略不计。为UBPMSM的设计和优化提供了参考价值。© 2022 日本电气工程师协会。由 Wiley Periodicals LLC 出版。