A Novel Open-Phase Fault Detection Method for Dual Y Shift 30 Degrees Permanent Magnet Synchronous Motor

Fault-tolerant operation of electric motors has attracted more and more attention in automobile industry. Dual Y shift 30 degrees permanent magnet synchronous motor (DT_PMSM) is becoming more and more popular because of its good fault tolerant operation ability and lower torque ripples. Fault detection is the prerequisite for fault tolerant operation, while the research on detecting open-phase fault (OPF) of DT_PMSM is rare. In this paper, a method based on the ratios of variables after vector space decomposition is used to study the fault diagnosis of open-phase fault. This scheme can quickly detect and locate the faulty phase, which is not affected by operating conditions and doesn’t need additional voltage sensors. The simulation results confirm the capability of the proposed method to achieve fast detection speed with good robustness.