基于MATLAB频谱分析的永磁电机噪声分析方法

Noise Research Method of Permanent Magnet Synchronous Motor with Spectrum Analysis Based on MATLAB

设计开发了一款200 kW新能源车用永磁同步磁阻电机。对样机进行测试,发现在转子转速2 600 r/min时,电机发出尖锐的电磁噪声。采用录音设备录制了电机运行噪声,并用MATLAB软件对噪声进行了频谱分析,通过对比电机相关零部件共振频率以及电机运行噪声频谱分析结果,分析了可能发生共振的零部件,并对该零件结构进行了优化设计。优化后电机运行时的电磁噪声下降到了合理范围,验证了基于频谱分析的电机噪声声源分析的可行性和准确性。

A 200 kW permanent magnet synchronous reluctance motor was designed.However,it was found that the prototype motor made noises when the rotor speed was close to 2 600 r/min.An easier analysis method of the motor’s noise was proposed.The noises of the motor were analyzed by the MATLAB software.The resonance frequencies of the components of the motor were analyzed using the finite element analysis method.The noise source of the motor was confirmed by comparing the motor noise spectrum with the analyzed resonance frequencies.According to the experimental result,the noise of the motor was visibly reduced after optimal design.