This paper proposes a new approach that allows the diagnosis and the ability of discernment between the frequency signatures of eccentricity faults and those of demagnetization in a permanent magnet synchronous motor (PMSM). This approach is based on the application of a very selective band-pass filter in the stator current. A judicious calculation of the parameters of this filter makes it possible to extract only the frequency signatures of searched faults. The use of the relevant information on the magnitude and phase angle of the signatures, obtained by filtering, makes it possible to distinguish between both of the studied faults. The simple monitoring of the plotting in terms of polar coordinates of the combined information (magnitude/phase angle) of the signature’s characteristic of these two faults allows for this discernment. Experimental results show the effectiveness of the proposed approach when it comes to the diagnosis reliability of demagnetization and the eccentricity faults in a PMSM.

本文提出了一种新方法，该方法可以诊断和辨别永磁同步电动机（PMSM）中的偏心故障和去磁的频率特征。该方法基于在定子电流中应用非常有选择性的带通滤波器。通过对该滤波器参数的明智计算，可以仅提取搜索到的故障的频率特征。通过过滤获得的有关特征码幅值和相位角的相关信息的使用，可以区分两个已研究的断层。根据这两个断层的特征特征的组合信息（幅度/相位角）的极坐标对图形进行简单监控就可以实现这种识别。