Finite Element Modeling of Stator Winding Faults in Permanent Magnet Synchronous Motor: Part II

Abstract

Stator Winding Faults (SWFs) in Permanent Magnet Synchronous Motors (PMSMs) adversely affect the performance of the machine. The machine quantities in terms of stator phase currents, back-EMF, magnetic flux density and flux lines changes significantly. This paper shall investigate in detail the adverse affect on different electrical and magnetic quantities during the SWFs in PMSM. Earlier in Part I, the authors have modeled the machine using analytical approach to draw the inferences on the performance of PMSM during healthy and faulty conditions. This paper shall discuss in detail about the validation of those results with the outcomes obtained through Finite Element (FE) modeling of PMSM using Maxwell 2D tool. FE modeling of PMSM involves Numerical Method (NM) approach which though takes high computational time but deliver better accuracy. FE model of PMSM with an emulation of different SWFs viz. Stator Inter-turn Fault (SITF), coil-to-coil fault and phase-to-phase faults are developed. The performance of the machine is then compared under healthy and faulty conditions. The performance deductions are further analyzed and compared with the analytical outcomes thereby giving a validation of SWFs in PMSM. The significant outcomes like changes in phase currents, back-EMF and magnetic flux density, thus encountered are further used to define fault index for the detection and identification of SWFs in PMSM.