A Novel Design of Optimal Phase Current Waveform for an Electric Vehicle Wheel Motor

摘要

A novel design of optimal current waveform for a disc-type axial-flux wheel mo- tor is presented in this paper. This dedicated wheel motor has been designed and installed directly inside the wheel of electric vehicles without mechanical differ- entials and reduction gears. The torque-oriented optimization is performed to obtain the optimal current waveform subject to various constraints for indepen- dent winding structure. The best one of the optimal waveforms for maximized torque with confined ohmic loss is found to be proportional to the magnetic flux variation in the air-gap between the stator and the rotor.