Detection of Inter-turn Short Circuit Fault in Permanent Magnet Synchronous Machine under Phase Current Reconstruction Control

This paper proposes a diagnostic method for inter-turn short circuit (ITSC) fault in permanent magnet synchronous machine (PMSM), especially under the phase current reconstruction fault-tolerant control. Rotor speed signature analysis is proposed to indicate the ITSC fault instead of the current signal, which suffers from waveform distortion due to the reconstruction error and low sampling frequency. The Vold-Kalman filtering order tracking method is employed to extract the fault feature and continuously monitor the deterioration of the residual insulation. The performance of the proposed method is experimentally evaluated on a PMSM with the ITSC fault.