一种基于电流反馈的分段式PWM控制无刷直流电机转矩波动抑制方法

发布时间：2018-04-20 12:38

本文选题：无刷直流电机 + 非理想反电动势　；参考：《电工技术学报》2017年17期

【摘要】：无刷直流电机伺服系统具有广泛的应用场合,但转矩波动限制了其在高精度场合的应用。针对非理想反电动势引起的无刷直流电机转矩波动提出了一种基于电流反馈的分段式PWM控制方法。该方法通过线反电动势观测器获得产生目标转矩值的参考电流,以实现对电机转矩的直接控制。同时,针对电机高速与低速运行状态分别采用不同的PWM控制策略来有效消除换相转矩波动,系统具有低转矩波动和高转矩输出的特点。通过在Matlab/Simulink环境下建立系统仿真模型,对该控制方法的转矩直接控制能力进行检验,并对转矩波动进行了对比;搭建实验平台对具有非理想反电动势的无刷直流电机进行了驱动实验。仿真和实验结果表明,该文所提出的控制方法能有效减小转矩波动,提高无刷直流电机伺服系统输出转矩的稳定性和位置控制精确度。
[Abstract]:Brushless DC motor servo system has a wide range of applications, but torque ripple limits its application in high precision situations. A segmented PWM control method based on current feedback is proposed for torque ripple of brushless DC motor caused by non-ideal backEMF. In this method, the reference current which generates the target torque value is obtained by the line backEMF observer to realize the direct control of the motor torque. At the same time, different PWM control strategies are adopted to eliminate commutation torque ripple effectively according to the high speed and low speed running state of the motor. The system has the characteristics of low torque ripple and high torque output. By establishing the system simulation model under the Matlab/Simulink environment, the torque direct control ability of the control method is tested, and the torque ripple is compared. An experimental platform was built to drive the brushless DC motor with non-ideal back EMF. Simulation and experimental results show that the proposed control method can effectively reduce torque ripple and improve the output torque stability and position control accuracy of brushless DC motor servo system.
【作者单位】：上海理工大学光电信息与计算机工程学院电气系;
【基金】：国家自然科学基金项目资助(51207091/E070303)
【分类号】：TM33

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