Fault Diagnosis in PMSM with Partitioned Stator Windings -Part II: Interturn Short-Circuit and Static Eccentricity

A strategy for interturn short-circuits and static eccentricity diagnosis in permanent magnet synchronous machines (PMSM) is proposed in this paper. In several practical implementations, the PMSM faults produce similar behavior patterns on electrical signals. In these cases, robust diagnostic strategies are required in order to identify the fault, without being influenced by external disturbances. To achieve this goal, a 2D model of PMSM was designed and evaluated by using of a finite element method (FEM). The fault diagnosis is realized by analyzing the behavior pattern of a residual voltages (RV) in the alpha beta plane. A PMSM prototype with modified stator windings and bearings with eccentric bushings was used to evaluate the proposed diagnosis strategy. Experimental results obtained with this PMSM demonstrate the correct fault diagnosis of both, interturn short-circuits and static eccentricity.