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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).
고 토크 외전형 인휠 모터의 약계자 제어를 통한 고속 구동 연구
황윤식(Yunsik Hwang),김준성(Junsung kim),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.4
The paper presents the high-speed drive control of high torque outer rotor in-wheel type BLDC motor for E-bike through the flux weakening control. SPMSM and IPMSM are designed in two ways. The current and the current phase angle according to the inductance Ld, Lq be calculated through FLVM(Flux Linkage Vector Method). High torque BLDC motor designed to minimize current consumption and to enable high speed on flat ground. The torque, speed are calculated using d-q axis equivalent circuit simulation according to the current and the current phase angle. Finally of high-speed driving is verified by analyzing the simulation results of the field weakening control.
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).
전동 컴프레서 구동 모터의 전류 진상각 제어를 통한 특성 개선
김희운(Heewoon Kim),황윤식(Hwang, YunSik),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
EV/HEV has the different mechanism with the internal combustion engine. Thus, the components are different, too. One of the components is the electric compressor. The internal combustion engine vehicle adopted the compressor using the engine driving force and EV/HEV adopted the compressor which compresses the refrigerant by using the motor. In the electric compressor, the interior permanent magnet (IPM) is used in the electric compressor because of demanding the motor both of the high efficiency and power. When the motor rotate at high speed, IPM type has the structural advantage preventing the secession of the permanent magnet. And the IPM type motor can use the reluctance torque and make the high generating power. Theoretically, the BLDC motor has the fixed torque without the torque ripple in case of that the phase current is passed sequentially. Because the BLDC motor has the back electromotive force (BEMF) that is the trapezoid. However, in the motor, the ideal square wave current cannot be made the inductance component of the stator winding. Therefore, there is the ripple of the phase current in the parts that the phase currents commutate. This makes the torque ripple. The torque ripple causes the noise, the vibration and the decrease of motor performance. Therefore, the supplementary design is essential for improving the motor characteristic. In this paper, the lead angle control was proposed for improving the characteristic degradation that is generated due to the current ripple. The lead angle control is the method that supplements the current delay through the lead angle. And the lead angle control improves the characteristic of the motor. The error due to the delay of the current is anticipated through the analysis of inductance and calculation. The setting of the lead angle is important because it occurs to the deterioration of the motor characteristics if the lead angle is too large.
HFCVD법에서 아르곤가스 첨가에 대한 다이아몬드 결정성의 변화
황윤식,김용,박홍준,이재열 동아대학교 기초과학연구소 2001 基礎科學硏究論文集 Vol.18 No.1
HFCVD법을 사용하여 수소와 메탄의 혼합가스에 아르곤가스를 첨가하여 다이아몬드 박막을 증착하였다. 아르곤가스의 첨가비와 증착온도에 따라 증착한 박막의 결정 크기 변화를 알아보았다. 증착된 다이아몬드 박막을 SEM, XRD, Raman으로 조사하여 특성을 알아보았다. The morphological change of diamond films was investigated. The argon was added to the conventional methane-hydrogen gases in the hot filament chemical vapor deposition method. The structure of the film was characterized by SEM, XRD, and Raman spectroscopy. It was shown that the addition of the argon gas resulted in the formation of nano-sized diamond crystallites effectively.