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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.
ODD 회전 디스크의 틸팅 각운동에 의한 소모전력 해석
정희용(Heeyong Chong),성상진(Sangjin Sung),장건희(Gunhee Jang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This paper measured and analyzed the source of total power loss of an ODD of a notebook computer. It shows that the biggest power loss is the windage loss due to the friction between rotating disc and surrounding air. It measured the power loss by the tilting motion of a rotating disc which is originated from the unbalanced mass of the rotating disc or the squareness between case-rotor and shaft. The power loss of rotating disk due to tilting motion was also calculated by using FLUENT, and it was correlated with the measured one. This paper shows that the one of the effective methods to reduce the power loss of an ODD is to reduce the tilting motion of a rotating disc.