Analysis of Inchoate Interturn Short Circuit Fault for Permanent Magnet Synchronous Motor Based on Ansoft

Considering the defect of electric circuit method,This paper establish the two-dimension instantaneous finite element model of Permanent Magnet Synchronous Motor(PMSM) based on Ansoft.The electromagnetic field distribution and relevant performance curves are obtained by simulation using the powerful electromagnetic field analysis and post process functions of Ansoft when PMSM works normally and at 2%、5% interturn short circuit fault of the stator winding.The harmonic content of back EMF when PMSM works at different conditions are analyzed.Conclusions are drew such as that the third harmonic of back EMF decrease with the in crease of interturn short circuitwhich provide foundation for the diagosis of inchoate stator winding interturn short circuit of PMSM.