Characteristic analysis and diagnosis of short-circuit fault in armature winding of four-phase variable flux reluctance machine

Abstract

To improve the reliability of the variable flux reluctance machines (VFRMs) in the early stages, this letter proposes a novel fault feature for armature winding short-circuit (AWSC) fault in four-phase VFRMs. First, the harmonic characteristics of field induced voltage are researched theoretically in detail under normal and AWSC conditions. Then, a diagnosis method based on the harmonics of the field induced voltage is proposed and analyzed by simulation. Finally, related experiments are conducted to verify the proposed method. The proposed diagnosis method is simple and feasible, which can realize reliable protection of the power generation system for safe operation.