Design process of a traction motor for a hybrid bus application

This study addresses the requirements of a traction motor design process. In a traction application, the design parameters are electrical, mechanical, and thermal issues, and especially, the reliability. The electrical design optimizing process of a motor takes into account the magnet shape, the magnet embedding depth, and the flux-guiding air pocket areas on the magnet sides. The application in question is a hybrid bus with a permanent magnet motor, a diesel prime mover, and a generator as a series drive system. In a traction application, the efficiency should be sufficient over a wide speed range, despite the fact that the torque demand can be very challenging.