Research on Fault Diagnosis Strategy of Dual Three-Phase Permanent Magnet Synchronous Motor Drive System Based on Current Residual Errors

This paper proposes an open-circuit fault diagnostic method of power switch for dual three-phase permanent magnet synchronous motors (DTPPMSM) drive system based on current residual errors (CRE) analysis. This method can realize real-time detection and localization of single power tube and single-phase winding open-circuit faults. When an open-circuit fault occurs, the characteristics of CRE are analyzed by comparing the measured motor phase current signals with their corresponding reference current signals. The CRE contains open-circuit fault information of the power tube, which can realize fault diagnosis and location for the faulty switch. Furthermore, the method just uses the motor phase currents as inputs, avoiding the use of extra sensors. The simulation results show that the proposed method can accurately diagnose single power tube or single-phase winding open-circuit faults and will not cause misdiagnosis when load change suddenly.