Novel Stator Core of the Permanent Magnet Assisted Synchronous Reluctance Motor for Electric Bicycle Traction Motor Using Grain-Oriented Electrical Steel

Abstract

This paper proposes novel type of stator of permanent magnet assisted synchronous reluctance motor for electric bicycle propulsion motor. Instead of conventionally used non-grain-oriented electrical steel (NO), grain-oriented electrical steel (GO) is used for the stator teeth. The usage of the GO on the stator teeth enables improvement of the output torque, efficiency, and no-load condition iron loss characteristic of the motor. The performance validation is conducted by 2-D finite element analysis, and proposed model shows 11.45% of torque increasement and 10.57% of no-load condition iron loss reduction compared with conventional model with NO. Such torque increasement enables downsizing of the motor, with 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> reduced stacking length. As a result, the improvement of the downsizing model on the no-load iron loss, load condition copper loss, and efficiency was 19.52%, 8.17% and 1.5%, respectively.