High-Frequency Signal Injection-Based Various Cable Connection Fault Diagnostics of PMSM

This paper presents a comprehensive diagnostic method for cable connection faults in permanent magnet synchronous motor (PMSM). The method utilizes high-frequency voltage injection at zero speed and considers single and multiple faults, including the misconnection of two-phase powerlines, disconnection of one-phase powerlines, and cable swap of position sensors. Mathematical derivations of the response current are provided and an offline diagnosis is performed using a support vector machine (SVM). The SVM is trained with a range of response signals, and feature extraction algorithms are employed to enhance the classification accuracy. Experimental results demonstrate the effectiveness of the proposed method in detecting, identifying, and locating faults, thereby achieving a comprehensive and highly accurate diagnosis for various PMSM cable faults with different causes. This contributes to the overall reliability of the system.