Analysis of a New Method for Reduction of Cogging Torque in a Direct-Drive In-wheel Flux Switching Motor

Electric motors in electric vehicle and other industrial applications have always been studied in terms of torque density, efficiency and torque characteristics in various literature. Flux Switching motors could be an appropriate option for electric vehicles, especially for direct drive applications. In direct drive application, simplicity, depreciation and entire system efficiency could be improved by eliminating gearbox. In this application, torque features are highly significant because in addition to average torque and torque ripple, it has some secondary effects such as vibration and noise, which is particularly significant. A new method is presented in this paper to reduce torque ripple and then, by 2D FEM simulation the electromagnetics torque feature of the proposed technique is investigated and compared with the conventional model. It is proved that by employment of the presented method, torque ripple is reduced to a desired degree, meanwhile; other magnetic features are maintained to an acceptable level.