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자기장 내 철가루 움직임의 실시간 시뮬레이션 및 시각화
윤원배(WonBae Yoon),이남일(Namil Lee),황철호(CheolHo Hwang),한정현(JungHyun Han) 한국HCI학회 2014 한국HCI학회 학술대회 Vol.2014 No.2
자기장 내의 철가루 입자들은 서로 자기력을 주고받으며 자기력선 모양을 따라 배치된다. 본 논문은 자기장 영향권에 있는 종이에 뿌려진 철가루의 움직임을 실시간으로 시뮬레이션하는 기법을 제안한다. 이 기법의 핵심 내용은 각 철가루에 미치는 주변 철가루의 힘을 계산하는 대신 가상의 자성체로부터 받는 힘을 계산하는 것이다. 가상의 자성체는 자석이 생성한 자기장과 철가루의 분포 두 가지를 고려하여 배치되고, 철가루들은 가까운 가상의 자성체들로부터 자기력을 받아 움직이게 된다. 제안된 기법을 사용한 결과는 실제 철가루 실험 결과와 매우 유사하여 초중등 과학교과목 가상 실험에 사용될 수 있을 것으로 판단된다. When we scatter iron filings in a magnetic field, iron filing particles form the shape of the magnetic field lines. In this paper, we propose an efficient real-time method that simulates the movement of iron filings in 2D space. The proposed method uses the force from a set of virtual magnets instead of the force from the particle pairs. The virtual magnet positions are determined by estimating the particle distribution as well as measuring the magnetic field created by the magnet. Iron filings obtain the force from nearby virtual magnets. The proposed method is both efficient and robust, and can be used for virtual experiments in elementary and middle schools.
전기자전거 구동 모터의 극/슬롯 비율 조합을 통한 코깅 토크 저감 설계
황윤식(Yunsik Hwang),이남일(Namil Lee),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.4
Recently, Electric bike is being spotlighted because that is environmentally friendly forms of transport with low noise, low pollution as well as convenience for use. BLOC Motor mainly used for electric bike due to high efficiency and high torque characteristics. But, The structure of BLOC motor produces vibration and cogging torque because of reluctance according to rotating the rotor. The cogging torque is caused by unbalance torque according to permanent magnet in a motor. As a result, it is difficult to ride electric bike comfortably because of vibration, noise. For these reasons, The motor for electric bike must have low cogging torque characteristic design. This paper compared the effect of pole/slot combination on the cogging torque and back-emf waveform between conventional and new models which are analyzed by FEM(Finite Element Method).
전기자전거 구동 모터의 극/슬롯 비율 조합을 통한 코깅 토크 저감 설계
황윤식(Yunsik Hwang),이남일(Namil Lee),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.4
Recently, Electric bike is being spotlighted because that is environmentally friendly forms of transport with low noise, low pollution as well as convenience for use. BLDC Motor mainly used for electric bike due to high efficiency and high torque characteristics. But, The structure of BLDC motor produces vibration and cogging torque because of reluctance according to rotating the rotor. The cogging torque is caused by unbalance torque according to permanent magnet in a motor. As a result, it is difficult to ride electric bike comfortably because of vibration, noise. For these reasons. The motor for electric bike must have low cogging torque characteristic design. This paper compared the effect of pole/slot combination on the cogging torque and back-emf waveform between conventional and new models which are analyzed by FEM(Finite Element Method).