基于有限元模型的永磁同步电机结构振动特性研究

The Influence of Stator Structure on Natural Frequency of Permanent Magnet Synchronous Motor

对电机模态固有频率的精确计算及准确分析是电机低噪声驱动设计的一个重要环节。由于用于电动汽车的永磁同步电机(PMSM)属于小型电机,机壳和端盖等装置对振动噪声的影响不容忽略,因此对不同电机结构部件以及耦合系统固有频率进行计算分析具有重要意义。基于一台12槽8极PMSM,利用有限元软件,考虑了铁心材料的各向异性、弹性模量、浸漆、机壳和端盖连接方式等影响,精确建立了定子铁心结构的计算模型,并用锤击法模态实验验证了有限元仿真模型的精确性。

The precise calculation and accurate analysis of the natural frequencies of motor modes are crucial for the design of low-noise motor drives.Permanent magnet synchronous motors(PMSM)used in electric vehicles are considered small-scale motors,and the influence of components such as the casing and end caps on vibration noise cannot be overlooked.Therefore,it is of great significance to accurately calculate and analyze the natural frequencies of different motor structural components and coupled systems.Based on a 12-slot 8-pole PMSM,finite element software is utilized to consider the effects of core material anisotropy,elastic modulus,impregnation,and casing-end cap connection methods.A precise computational model of the stator core structure is established,and the accuracy of the finite element simulation model are verified using modal experiments.