Induction motor finite element analysis for EV application, torque ripple and inter-turn circuit

Abstract

The use of the Induction Motor in the Electric Vehicle application presents several challenges. In this domain predictive maintenance has become a strategic notion. Economic importance of on line diagnosis of faults in electric machines gave rise to various researches in that field. This paper primarily focuses on the torque ripple reduction by varying the rotor slot geometry. Secondly it deals the Induction Motor in degraded mode in essentially the event of a short circuit between windings and between phases using finite element model of the machine. Accurate models of the Induction Machine under healthy and faulty conditions are developed using finite element method and the performance of the motor is examined. In this paper, the static two-dimensional analysis is done for stator inter turn fault and short-circuit between phases. The classical motor current signature analysis has been used to evaluate the stator current harmonic components. The machine parameters like flux linkage, flux density, are obtained for healthy and faulty motor. The results examined under various conditions are compared and the observations are presented.