Abstract
This paper presents a comprehensive analysis of PMSM stator winding impedance variation in inter turn short circuit and eccentricity faults. The phase impedances are monitored through an extended self-commissioning procedure at standstill mode before or after operation, and hence agnostic to well-known issues caused by transients, load/speed level or controller coefficient dependency. Moreover, the effect of stator iron core saturation on the electric parameters analyzed in depth. In order to distinguish the inter turn shorts from the eccentricity fault which exhibits similar behaviors, a classification algorithm based on the saturation effect is introduced and analyzed on the machines with different pole-slot combinations. Both 2-D FEA simulation and experimental test results are provided to show the efficacy of this analysis.
