Online PMSM Stator Interturn Fault Detection Aided by Phase Angle Diagnosis of Zero-sequence Components

Abstract

Accurate diagnosis of slight inter-turn short circuit fault (ISCF) of permanent magnet synchronous motor (PMSM) has always been a difficult problem in the field of electrical engineering. Aiming at the problem of ineffective ISCF diagnosis, a method on Phase angle diagnosis of zero-sequence components is proposed. In this method, a calculable expression of the fault indicator was derived in a wye-connected winding PMSM with ISCF, being for both slight and severe ISCF cases. Using the derived expression, ISCF were detected, as well as the degree and the location of the ISCF. Simulation results demonstrated that the proposed method not only has the capacity of diagnosing the ISCF, but also assessing the faulty severity and identifying the fault location under the different conditions of the rotor speed and load torque.