Permanent Magnet Design for Reduction of Cogging Torque in Innner Rotor Brushless DC Motor

내전형 BLDC 전동기의 코깅 토크 저감을 위한 영구자석의 형상 설계

In the slotted motor, cogging torque is generated due to the interaction between the rotor magnets and the slots on the stator. It is well known that cogging torque produces vibration and noise which may be detrimental to the performance of position and speed control system. Hence, the prediction of cogging torque is very important at the design stage of BLDC motor. In this paper, permanent magnets with different arc an91e of inner and outer radius is proposed. The cogging torque of proposed model and conventional one is analyzed by 2-D FEM and compared.