다극 회전자를 갖는 영구자석 기기의 코깅토크 저감을 위한 해석적 접근 및 실험적 검증

Analytical Approach and Experimental Verification for the Cogging Torque Reduction of Permanent Magnet Machines with Multi-pole Rotor

In order to reduce the cogging torque, by predicting the variation of the cogging torque according to pole arc/pitch ratio by analytical and FE methods, pole arc/pitch ratio which makes the cogging torque minimum are determined. And then, the measurements of cogging torque for permanent magnet generators with determined pole arc/pitch ratio are presented. The reasons for the error between predicted and measured value are discussed fully in terms of the shape of permanent magnet. Finally, by confirming that predicted results for cogging torque according to pole arc/pitch ratio and skew are shown in good agreement with those obtained from measured one, the validation of analysis results is confirmed.