Diagnosis Method for Power Switch Open-Circuit Fault of Triple Three-phase PMSM System in complex Operations

A novel diagnosis method based on normalization average current park vector (ACPV) for power switch open-circuit fault in triple three-phase permanent magnet synchronous motor (TTP-PMSM) system is proposed, which has good robustness to the transient disturbances during operating redundancy and speed/load switching. This diagnosis method contains two parts: fault redundancy detection and fault power switch detection. The ACPV moduli-imbalance based fault redundancy detection can effectively overcome the fault coupling between different redundancy. And the ACPV based feature values can be used to achieve the fault switch location in fault redundancy. The resulting diagnosis method can achieve the fault detection in different redundancy combinations and complex operations with simple structure and rapidity. Finally, the effectiveness of the proposed method is verified by simulation.