反电势均值滤波的无刷直流电机无感控制策略

Position Sensorless Control Strategy of Brushless DC Motors Based on Back EMF Moving Average Filter

针对无刷直流电机低速时反电势波形会产生严重畸变的问题,提出了一种基于改进移动均值滤波器的无刷直流电机反电势无感控制策略。首先通过Matlab对低速时的反电势波形进行离线重构,对比使用了均值滤波的反电势波形,验证了理论的可行性;其次通过Simulink进行仿真对比,验证了该方法在全速域上换相精度的优越性;最后对均值滤波器的窗口大小选择、中断时间等设计因素对于换相精度的影响进行了深入探讨,并优化了运算量。Simulink仿真和离线对比证明了本文所提出的无位置传感器控制方法在无刷直流电机低速运行时具有良好的换相精度和普遍适用性,具有一定的实用价值。

Aiming at the problem that the back EMF waveform of the BLDC motor will be seriously distorted at low speed,a sensorless control strategy for the back EMF of the BLDC motor based on an improved moving average filter was proposed.Firstly,the back-EMF waveform at low speed was reconstructed offline by Matlab,and the back-EMF waveform after using the mean filter was compared to verify the feasibility of the theory;secondly,the simulation comparison was performed by Simulink,which showed the superiority of the method on commutation accuracy in the full-speed domain.Finally,the influence of design factors such as window size selection and interruption time of the mean filter on the commutation accuracy was discussed in depth,and the calculation amount was optimized.Simulink simulation and offline comparison prove that the position sensorless control method proposed in this paper has good commutation accuracy and universal applicability when the brushless DC motor runs at low speed,and has certain practical value.