Theoretical and Simulation Analysis of Influences of Stator Tooth Width on Cogging Torque of BLDC Motors

Cogging torque reduction is one of the most important requirements in the design of BLDC motors due to its direct impact on the performance of the motor. In this paper, the influences of tooth width and slot/pole match on cogging torque corresponding to both uniformed teeth and nonuniformed teeth were theoretically analyzed on the basis of analytical expressions of cogging torque deduced with energy method. Furthermore, several models which denote features of different slots and poles were setup and calculated in finite element analysis software Flux2D, the result of which verified the theoretical analysis. Valuable conclusions and some suggestions were given in the paper which is meaningful to the design of good performance BLDC motors.