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착자 불균일이 존재하는 브러시리스 DC 모터의 치의 형상에 따른 코깅토크 해석
성상진(Sangjin Sung),장건희(Gunhee Jang),이청일(Chungill Lee),박상진(Sangjin Park) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This paper investigates the characteristics of the cogging torque in brush less DC motors due to the uneven magnetization of permanent magnet and the teeth shape. The excitation frequencies of cogging torque are the harmonics of the least common multiple of pole and slot in ideal brush less DC motors. However, this paper shows numerically and experimentally that the uneven magnetization of permanent magnet generates the harmonics of slot number. It also investigates that their magnitudes are affected by the teeth shape. Therefore, chamfering teeth increases the magnitude of the harmonic of slot number so that the magnitude of cogging torque increases in unevenly magnetized case.