Analysis of the Influence of Winding Phase Shift of Dual Winding Permanent-Magnet Synchronous Machines on Inter-turn Short Circuit Fault

This study delves the impact of winding phase shift on the electromagnetic characteristics of operation with fault tolerance in a dual winding permanent magnet motor (DWPMSM) experiencing faults due to inter-turn short circuits. Firstly, the analytical expressions of fault inductance and short-circuit circulating current (SCCC) for a 12-slot/10-pole DWPMSM are derived based on the theory of winding function. Secondly, finite element analysis simulation models are constructed for the purpose of comparing and analyzing the amplitude of SCCC. This analysis extends to the examination of torque characteristics in the DWPMSM across various phase shift angles and speeds. The investigation reveals that the winding with a 30° phase shift exhibits the least self-inductance, while the self-inductance of the 0° phase-shift winding and the 60° phase-shift winding is larger. The amplitude of the SCCC for a 30° winding configuration is the largest. Besides, when n = 500 rpm, the torque characteristics of the 30° winding configuration are the best. Nonetheless, when n = 2500 rpm, the torque performance degrades as the count of short-circuit turns rises. Finally, the prototype is tested to verify the short circuit fault characteristics of the DWPMSM.