An analytical method for vibration characteristics analysis of motor stator core

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (3) : 81-86.

QU Renhao, JIANG Weikang

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Abstract

With development of new energy source vehicles, motor noise requirements of users are increasingly strict, noise and vibration analyses become an important part of motor development. Electromagnetic vibration of stator is the main noise source of a motor. Due to the complex structure of stator, the finite element (FE) method is usually used to model and analyze vibration characteristics of stator core, and it takes too long time to meet rapid calculation requirements of vibration and noise characteristics of stator optimization design. Here, an analytical method was proposed to calculate vibration characteristics of stator core. A thick shell-beam coupled structure was adopted to simplify stator core, and effects of stator teeth on vibration characteristics were considered. The coupled structure’s energy functional was derived using interface continuity conditions. Rayleigh-Ritz method was used to calculate a stator core’s natural frequencies and modal shapes. Finally, the proposed method was applied to calculate vibration characteristics of a certain stator core, and effects of stator teeth were analyzed. The results obtained with the proposed analytical method were compared with those obtained with the famous FE software. It was shown that the error between them is less than 5% to verify the correctness of the proposed analytical method.

Key words

analytical method / thick shell-beam coupled / vibration characteristics / natural frequency / stator core

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QU Renhao, JIANG Weikang. An analytical method for vibration characteristics analysis of motor stator core[J]. Journal of Vibration and Shock, 2021, 40(3): 81-86

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