基于MATLAB非理想反电动势无刷直流电机仿真

Simulation Research on Non-ideal Back-EMF BLDCM Based on MATLAB

摘要:

通常无刷直流电机的反电动势通常不呈理想梯形波,为了对非理想反电动势无刷直流电机进行建模,结合转速稳定下无刷直流电机反电动势波形具有周期性的特点,针对转速稳定时的一个电气周期内的反电动势波形进行分析,在满足狄利克雷条件下,提出了一种基于傅里叶级数展开的复杂非理想反电动势无刷直流电机建模方法。在MATLAB中采用该方法对非理想反电动势无刷直流电机建模,并对不同驱动方式下非理想反电动势无刷直流电机的转矩波动进行仿真。最后,分析并比较了8种不同驱动方式下的仿真结果,为非理想反电动势无刷直流电机驱动设计提供参考。

Abstract:

Usually, the back electromotive force (BEMF) of brushless direct current motor (BLDCM) is not the ideal trapezoidal wave. In order to construct the simulation model of the BLDCM with non-ideal BEMF, the BEMF waveform in an electrical period is analyzed, based on the characteristic that the BEMF waveform is periodic. The BEMF waveform meets the Dirichlet condition, and a method to model the BLDCM with non-ideal BEMF based on Fourier series is presented. The modeling method is applied in MATLAB to build the BLDCM with non-ideal BEMF. Finally, with this non-ideal BEMF model, the torque ripple of different BLDCM driving modes is simulated and the simulation results are analyzed and compared, which provides a reference for non-ideal BLDCM drive design.