This paper mainly studies the influences of air-gap deformations on the electromagnetic performances and radial vibration characteristics of an interior permanent magnet synchronous motor (IPMSM) at peak rotating speed with rated power. Considering different air-gap states in the electromagnetic finite-element models of investigated IPMSMs, the effects of stator oval deformation, rotor centrifugal distortion, and both deformations on the air-gap magnetic flux field, radial and tangential magnetic force, and electromagnetic torque are analyzed and compared. Then, based on the accurate structural model of the stator system, the motor vibration characteristics are investigated with loading different electromagnetic force excitations on the stator inner face. Finally, the vibration experiments of the investigated IPMSM prototype are carried out to verify the results obtained by the simulations at a high-speed load condition. It is found that the air-gap deformations give a large increase in the particular vibration level. In order to improve the prediction accuracy of motor vibration characteristics, the air-gap deformations under all electromagnetic excitations, including magnetic force and torque pulsation, should be taken into consideration.

中文翻译：

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考虑气隙变形的内置永磁同步电机磁力和转矩脉动引起的径向振动分析

本文主要研究气隙变形对内置式永磁同步电机(IPMSM)在额定功率峰值转速下的电磁性能和径向振动特性的影响。考虑到所研究的 IPMSM 的电磁有限元模型中的不同气隙状态，定子椭圆形变形、转子离心变形以及这两种变形对气隙磁通场、径向和切向磁力以及电磁转矩的影响为进行了分析和比较。然后，基于定子系统的精确结构模型，研究了在定子内表面加载不同电磁力激励的电机振动特性。最后，对所研究的 IPMSM 原型进行振动实验，以验证在高速负载条件下通过模拟获得的结果。发现气隙变形使特定振动水平大大增加。为了提高电机振动特性的预测精度，应考虑所有电磁激励下的气隙变形，包括磁力和扭矩脉动。