新能源高速电机台架“L型”支座振动分析

Vibration Analysis of L-shaped Support at a New Energy High-speed Motor Bench

在进行中车某新能源电机测试时,测试台架在运行到10000~10500rpm时发生振动异常,振动烈度严重超标。因此,建立被测电机和"L型"支座的有限元模型,通过模态分析,发现振动异常为"L"型支座一阶固态频率在电机工作频率范围内所致,于是优化"L"型支座结构,通过模态分析和谐响应分析论证了结构的安全性,并进一步通过试验论证了优化后的结构振动大幅度下降,可为电机支座设计避开共振和刚度是否满足要求提供参考。

During the test of a new energy motor of CRRC, when the test bench was running at 10000 rpm to 10500 rpm, abnormal vibration occurred, and the vibration intensity exceeded the standard severely. In this paper, a finite element model of the tested motor and L-shaped support is established. It is found through the modal analysis that the abnormal vibration of the support is caused by the first-order natural frequency of the support within the motor operating frequency range. This paper optimizes the support structure and demonstrates the safety of the structure through modal analysis and harmonious response analysis. The structure vibration after optimization is further reduced by experiments. This article provides a reference for the design of the motor support to avoid resonance and whether the stiffness meets the requirements.