COGGING TORQUE REDUCTION IN PERMANENT MAGNET SYNCHRONOUS MOTOR USED IN E VEHICLE

ELECTRICAL AND ELECTRONICS ENGINEERING

Increasing global warming and pollution forced the world to walk in the path of electric vehicles. Electric vehicles to sustain this new change should give better performance and range in comparison with IC vehicles. A vehicles performance greatly depends on its prime mover and in case of EVs it the motors used to power the vehicles. Among various motor types available across the globe, PMSM has a remarkable power and torque density which would make it more suitable for automotive applications. But Vibrations caused due to Cogging effect of PM machines limits the application of PMSM in the automotive domain. Cogging torque is a negative effect which causes the output torque of the machine to fluctuate. This effect is the outcome of interaction of flux between the rotor permanent magnet and stator slots. This not only results in cogging torque but also indirectly responsible for torque ripple and vibrations. This vibration may crucially affect the structural strength of the vehicle and may also cause noise. This project attempts to reduce cogging torque of Interior permanent magnet synchronous machine by magnet shaping and orientational adjustments of the magnet. This will optimize the flux linkage with the slots and thereby reduces the cogging torque.

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