基于有限元的异步电机电磁振动分析

电机的电磁振动是电机电磁场与机械结构耦合的结果，要研究电机的电磁振动，需要将电机的电磁场和结构振动分析结合起来。通过有限元软件，采用一种弱磁-固耦合的方法，对异步电机的电磁振动特性进行分析。首先利用ANSOFT有限元软件建立异步电机的二维有限元模型，计算电机的瞬态电磁场，得到电机在给定转速稳态运行状态下的磁场分布和作用在定子上时变的电磁力；其次用ANSYS有限元软件建立异步电机结构的三维有限元模型，将ANSOFT软件得到的时变电磁力进行频谱分析并校正，然后施加到电机上，计算出电机结构的电磁振动响应。基于对电机电磁振动特性的分析，可以对电机的电磁参数和结构进行改进和优化设计，以降低电机的电磁振动

Electromagnetically excited vibration analysis for an asynchronous electrical machine with finite element method

The interaction between electromagnetic field and structure of an electrical machine leads to its electromagnetically excited vibration.In order to evaluate the electromagnetically excited vibration,the electromagnetic field analysis and the structural vibration analysis of the electrical machine should be combined.A weak-coupled method for the electromagnetically excited vibration of an asynchronous electrical machine was presented here based on the finite element method(FEM).Firstly,a 2D FE-model for the electromagnetic field of the asynchronous electrical machine was built with ANSOFT software,and the time-varying magnetic forces exerted on the stator at a given rotating speed were calculated.Then,a 3D structural FE-model of the asynchronous electrical machine was formed with ANSYS software.After analyzing the harmonic response of the asynchronous electrical machine,the harmonics of the magnetic forces were calculated and corrected.These harmonic electromagnetic forces were exerted on the structure of the asynchronous electrical machine and its electromagnetically excited vibration was computed.Based on the analysis of the time-varying magnetic forces and the electromagnetically excited vibration,the electromagnetic parameters and the structure of the electrical machine could be improved and optimized to reduce its electromagnetically excited vibration.