爪极发电机的电磁仿真分析与噪声识别

Electromagnetic Simulation Analysis and Noise Identification of Claw-pole Generator

对某型车用爪机发电机应用Ansoft软件做电磁场有限元分析,得到空载和负载下气隙磁密的分布。利用MATLAB软件对气隙磁密做谐波分析,得出在负载运行时,由于电枢反应和三相不对称性的存在,使得气隙磁密基波幅值减小、三次和三的倍数次谐波出现。最后利用Maxwell应力张量法得出径向电磁力,把电磁力做频谱分析,得出在电机噪声中36倍频是电磁噪声。

A finite element analysis of electromagnetic fields of a vehicle claw-pole generator was made by using the Ansoftware, the distribution of air gapflux density was obtained on the no-load operation. Aharmonic analysis of the air gapflux density was made by using MATLAB software, due to armature reaction and three-phase asymmetry, fundamental amplitude decreases,and the third harmonic and the three harmonics appeared in the load operation. Finally, the radial electromagnetic force was calculated by suing Maxwell tensor method, the electromagnetic spectrum analysis results show that 36 times frequency is electromagnetic noise.