Cogging torque reduction of single-phase brushless DC motor with a tapered air-gap using optimizing notch size and position

This paper reports a stator shape optimization design for reducing the cogging torque of single-phase brushless DC motor adopting an asymmetric air-gap to make them self-starting. Time step 2D-finite element analysis (FEA) was carried out to analyze the characteristics of a single-phase brushless DC motor. To reduce the cogging torque and maintain the efficiency and torque, the Kriging model based on Latin hypercube sampling (LHS) and a genetic algorithm (GA) were used. As an optimal design result, the cogging torque on the optimal model was reduced. Finally, the analysis and optimal design results were confirmed by FEA and the experimental results.