Development of a Singly Fed Mechanical-Offset Machine for Electric Vehicles

A new singly fed mechanical-offset (SF-MO) magnetless machine that can produce the desired torque performances for electric vehicle applications is proposed in this paper. By purposely mismatching the angle between two torque producing segments, the proposed SF-MO machine can well integrate individual torque components to reduce the resultant torque ripple values. Based on the electrical-offset concept, the proposed machine needs only one set of inverter. Therefore, the proposed machine can employ conventional control algorithm to reduce the hardware count of power electronics and to ease control complexity. Various machine performances are analyzed by using finite element method while experimental prototype is also built for verification.