基于磁场计算的PWM永磁无刷直流电机振动分析

摘要

In order to study the distribution of the vibration problem caused by the air gap magnetic field in the process of brushless DC motor speed regulation, the finite element method was used to calculate the air gap magnetic field and electromagnetic force excitation at different times and at the same speed and the duty cycle was 1 and 0. 5 respectively. The natural vibration parameters of motor stator core were obtained by structure field calculation, and the vibration of the motor was analyzed. This calculation and analysis method can provide reference for the motor designer.%为了研究无刷直流电机在调速运行时气隙磁场的分布情况引发的振动问题，采用有限元法计算了相同转速下电机在占空比为分别为1和0.5时，不同时刻电机气隙磁场和电磁激振力的分布，并通过结构场计算得到电机定子铁心的固有振动参数，分析了电机振动情况。该计算分析方法能给相关设计人员提供参考。