Performance Enhancement of the PMa-SynRM for Electric Bicycle Traction Motor by Grain-Oriented Electrical Steel Applied Teeth

Abstract

This paper proposes the method of enhancing the performance of the permanent magnet assisted synchronous reluctance motor (PMa-SynRM) for electric bicycle propulsion motor by partially applying grain-oriented electrical steel (GO). Contrary with conventionally used non-grain-oriented electrical steel (NO), the GO was partially applied to the stator teeth considering the magnetic anisotropy characteristics of the GO and flux path analysis of the target model. The utilization of the GO on the stator teeth enhances the performance of the PMa-SynRM, especially the output torque, efficiency, and no-load condition iron loss characteristic. Overall analysis is conducted by finite element analysis, and the proposed model shows torque increasement of 11.45% and no-load condition iron loss reduction of 10.57%, compared with conventional NO model. Such increasement of the torque and output lead to downsizing of the PMa-SynRM, and stacking length can be 10% reduced. As a result, the improvement on the no-load iron loss, load condition copper loss, and efficiency of the downsizing model was 19.52%, 8.14% and 1.07%, respectively compared with conventional model.