Modeling and Analysis of Interturn Short Circuit Fault in PMSM Motor for Electric Vehicle Applications

Electric vehicles are the best way to avoid the pollution in the environment. Various types of motors are available for this application and the selection of motor is customized based on the speed-torque requirement of the vehicle. Permanent Magnet Synchronous Motors (PMSM) are more suitable for electric vehicles due to fast dynamic response, higher efficiency and ease of control at both low speed and high speeds. These motors are prone to mechanical and electrical faults. Open circuit fault and inter-turn short circuits are the electrical faults. 30 to 40% of the electrical faults are due to short circuiting of windings. Inter-turn short circuit fault is dangerous and prolonged faults leads lead to line to ground fault. To ensure the reliability and safety of the electric vehicles, these faults have to be taken care. Early estimation of winding faults is very essential. This paper focuses on modeling and analysis of PMSM motor during normal operation and inter-turn short circuit fault. A novel and simple model during inter-turn short circuit fault is proposed. The simulation results for various fault percentages in A-phase windings are presented in this paper.