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Analysis and Modeling of Three Winding Stator Interturn Fault on Induction Machine for Electric Vehicle Application

In this paper, a transient model of an induction machine with a stator interturn fault in three windings of the machine with different percentages of shorted turns is analyzed for electric vehicle application. Stator fault is the most common and severe faults occurs in the motors. Analyzing the effects of a stator turn fault on the motor is a crucial feature in fault diagnosis of electric vehicles. This compels us to develop a model, which helps to analyze the behavior of the machine under stator fault conditions in any of the winding or on multiple windings. The percentage of turns shorted in the machine is varied and complete machine modeling with such a fault is performed in a stationary reference frame. The motivation of this paper is to predict the performance of an electric vehicle drivetrain under abnormal running conditions with a sudden stator fault. Moreover, the stator fault resistances in the three winding fault is also varied. This model helps to design a fault prediction and diagnosis system in electric vehicles to avoid sudden stalling during drive mode. The abnormal behavior in line currents, speed and torque of the induction machine under sudden fault conditions is simulated in MATLAB and the results are presented in this paper.