COMPUTER-AIDED-DESIGN AND ANALYSIS OF DIRECT-DRIVEN WHEEL MOTOR DRIVE

This paper presents the computer-aided design (CAD) and performance an alysis of a novel direct-driven wheel motor drive for electric vehicle s (EV's), The proposed motor is a permanent magnet square-wave motor, whose rotor with rare earth magnets forms the exterior of the motor, w hich can be fitted with a wheel tire to realize the direct drive for e ach wheel of an EV, The interior stator with its windings is rigidly m ounted onto the suspension and frame structure of the vehicle, In orde r to achieve the direct drive without any mechanical transmission for EV's, the wheel motor has been designed as a low-speed high-torque mot or, The design and optimization of the motor geometry was achieved wit h the aid of finite-element electromagnetic field analysis. Simulation studies on the transient performance of the motor drive were also car ried out, This involved the creation of the motor transient model and formulation of a motor control strategy to ensure the wheel motor driv e runs efficiently in the entire permitted speed and load range, The a pplication of CAD techniques in the design of this very unconventional drive is described in this paper.