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Design aspects of high torque density-low speed permanent magnet motor for electric two wheeler applications

This paper focuses on practical aspects of designing a direct drive electric motor having extremely high torque density for a two wheeler electric/hybrid vehicle. The design starts with arrival of motor specification based on the vehicle requirements, progress with finalizing the sizing parameters and examining the aspects which affect the performance of the motor with high torque density. Skin effect, magnet demagnetization, eddy current loss, thermal stability and cycle efficiency are the main concerns which are examined. The use of strip conductors to reduce the resistance and enhance the thermal stability is also discussed. Finally, the prototype is made and the experimental results are presented.