Design Characteristics of PM Motor for Electric Power Steering Aimed at Cogging Torque and Torque Ripples Reduction

코깅토크 및 토크리플 저감을 위한 EPS용 영구자석 전동기 설계 특성

Electric power steering(EPS) has many attentions such as fuel consumption improvement, thus it has been widely adopted for automotive application in recent years. In the EPS system, torque vibrations are directly transferred through the steering wheel to the hands of the driver. Hence, the design of PM motors for the EPS should be performed in order to reduce torque ripples including cogging torque. In this paper, Surface mounted Permanent Magnet Synchronous Motor(SPMSM) is designed to reduce torque ripples and cogging torque at a same time for the EPS propulsion and the design results are verified with the experimental ones.