基于改进电流法的PMSM绕组开路诊断方法

PMSM Winding Open-Circuit Diagnosis Method Based on Improved Current Method

针对传统永磁同步电机(PMSM)绕组开路故障诊断方法效率低下、适应性差等问题,提出了一种基于改进平均电流法的自适应阈值PMSM绕组开路故障诊断方法。首先,获取PMSM三相正常状态和故障状态的电流信号。其次,为克服测量噪声影响,对该信号进行滑动窗口滤波处理。然后,提出了一种改进平均电流法的绕组开路故障诊断方法,该改进平均电流法可得到自适应阈值,将滤波后的电流值与阈值的比较结果作为故障判断依据。最后,通过仿真平台验证所提算法,结果表明所提方法快速性好,稳定性高。

The traditional winding open-circuit fault diagnosis methods of permanent magnet synchronous motor(PMSM)have low efficiency and poor adaptability.An adaptive threshold PMSM winding open-circuit fault diagnosis method based on the improved average current method is proposed.Firstly,the current signals of the PMSM three-phase normal state and fault state are obtained.Secondly,to overcome the influence of measurement noise,the signal is filtered by a sliding window.Thirdly,an improved average current method for winding open-circuit fault diagnosis is proposed.The improved average current method can obtain the adaptive threshold,and the comparison result between the filtered current value and the threshold is used as the basis for fault judgment.Finally,the proposed algorithm is verified by the simulation platform.The results show that the proposed method has advantage of quickness and strong stability.