无刷直流电机在转子偏心故障时的容错控制研究

摘要

在一些工业场合,无刷直流电机需要在转子偏心故障的情形下保持运行状态,而传统的控制策略无法有效地实现容错运行.针对这个问题,提出了一种无刷直流电机在转子偏心时的故障容错控制策略.分析了在传统无刷直流电机控制方法中,每相定子电流参考在波形上是一致的,仅存在一定的相位延迟,而没有考虑电机偏心后导致的反电动势和相电感变化,因此电机偏心将导致未知的转矩脉动.新型控制策略在传统控制策略的基础上采用了在线估计方法,获取了相电感和反电动势的值,从而控制器设置定子电流参考时包含了对偏心故障的考虑和相关运算,从而使电机能够降低转矩脉动,具备一定的故障容错运行能力.最后通过对比试验的方法对新型控制策略进行了试验验证.%In some industrial applications,the brushless DC motor needs to maintain its operating condition in the case of the rotor eccentricity,and the traditional control strategy was difficult to achieve fault tolerance with it.Aiming at this problem,a fault tolerant control strategy for the brushless DC motor with rotor eccentricity was presented.First of all,in the conventional brushless DC motor control method,stator current commands were similar in shape and delayed by corresponding phase differences in each phase,without considering the change of the back electromotive force and the c phase inductance caused by the rotor eccentricity,so the unknown torque ripples would happen.Therefore,a novel control strategy based on traditional control strategy based on the online estimation of the phase inductance and back electromotive force value,thereby setting the stator current reference controller consists of eccentric fault.Then the motor could reduce the torque pulsation,and had the fault tolerant ability.The contrast experiments had been taken to verify that the proposed method at the last.