风冷永磁同步电机噪声分析与优化

Noise Analysis and Optimization of Air Cooled Permanent Magnet Synchronous Motor

以额定功率为18kW的风冷永磁同步电机为研究对象,建立二维电磁仿真模型,利用有限元软件计算其径向电磁力,通过快速傅里叶变换分析径向电磁力的谐波次数,分别对电机的定子和整机进行了模态测试,得到其各低阶模态固有频率,分析了电机振动和噪声产生的原因,提出了一种通过优化电机壳体结构降低电机噪声的方法,并对改进后的风冷永磁同步电机进行了热仿真分析和噪声试验验证,结果表明,改进后电机温升满足工作要求,噪声降低了约11 dB(A)。

With an air cooled PMSM(Permanent Magnet Synchronous Motor) with rated power of 18 kW as the research object, a 2D electromagnetic simulation model is established. Finite element software is applied to calculate the radial electromagnetic force of the PMSM, and FFT (Fast Fourier Transform) is used to analyze the harmonic frequency of the radial electromagnetic force. The modal tests of the motor stator and the whole machine are carried out respectively, and the natural frequencies of the modes of each order were obtained. The causes of motor vibration and noise are analyzed, and a method is proposed to reduce motor noise by optimizing the motor shell structure. The thermal simulation analysis and noise test verification of the improved air-cooled PMSM are carried out. The results show that the improved motor meets the temperature rise requirement and reduces noise by about 11 dB(A).