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외전형 다상 PM 전동기의 상전환에 의한 효율 향상 제어
오형식(Hyung-Shic Oh),최철(Cheol Choi),배채봉(Chae Bong Bae),김영국(Young Gook Kim),김장목(Jang-Mok Kim),김현철(Hyun-Cheol Kim) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
There are many changes in the electrical propulsion control system field along with fast development semi-conductor field. Research for electrical propulsion system that have profitable point excellently pulsation and noise aspect than existent Diesel propulsion system is progressing variously. In this paper, Control of Efficiency improvement by Changeover of Phase Windings with Outer-Rotor type Multiphase Permanent Magnet Motor is studied. This structure of multiphase machine is independent phase. The inverter of this system have structure of H-bridge, and take a six single-phase inverter.
오진석(Jin-Seok Oh),김장목(Jang-Mok Kim),조관준(Kwan-Jun Jo),오형식(Hyung-Shic Oh) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
The power electric system uses one of the most concerning factor for the reliablitiy of the electric propulsion ship. In this paper IGBT of the switching devices is modeled for cosisting inverter. The inverter is included the propulsion motor and it is cooled with fresh water system. The theraml conduction characteristic of model can be carried out with simulation, and the model is designed with the equivalent circuit of cooling fin module. Temperature variation is investigated through temperature of cooling fin and power loss of switching chip.
고정수,한동설,오형식,박병관,김종현,오세웅,Jeong Soo Ko,Dong Sul Han,Hyung Sik Oh,Byung Kwan Park,Chong Hyun Kim,Se Woung Oh Korean Chemical Society 1991 대한화학회지 Vol.35 No.5
메탄올-물 혼합용매 및 수용성 CTAB, SDS 용액에서 2-에틸안트라센[2-EA]과 9-페닐안트라센[9-PA]에 빛을 조사하는 동안 1,3-디페닐이소벤조푸란[DPBF]이 감소되는 것으로부터 이 반응에 단일항 산소$(^1O_2)$가 관여된다는 화학적 증거를 얻었다. 용매의 극성에 민간함 UV 분광학적 특성을 이용하여 2-EA와 9-PA의 평균미세환경의 극성을 조사하였다. 2-EA와 9-PA가 수용성 CTAB, SDS 및 Brij 35 용액에 가용화될 때 그들의 평균 미세환경은 극성이었으며, 미세환경의 극성 파라미터는 미셀의 이온성에 영향을 받지 않았다. 2-EA의 평균 미세환경의 극성은 40%(w/w) 에탄올 수용액의 극성과 비슷했으며, 9-PA의 경우는 30%(w/w)와 40%(w/w) 사이의 에탄올 수용액의 극성과 비슷했다. 이들 화학종들이 수용성 미셀용액에 가용화될 때 대부분 미셀의 표면에 분포할 것이라는 것을 알았다. 여러 용매에서 2-EA와 9-PA의 광증감능을 검토하였다. 메탄올-물 혼합용매가 수용성 미셀용액보다 광산화반응에 유리한 것으로 나타났다. The chemical evidence for involvement of singlet oxygen during photoirradiation for 2-ethylanthracene [2-EA] and 9-phenylanthracene [9-PA] was based on the rapid decomposition of 1,3-diphenylisobenzofuran [DPBF] in methanol-water mixture and aqueous CTAB, and SDS micellar solutions. The average microenvironmental polarities of 2-EA and 9-PA were estimated by UV spectroscopic characteristics sensitive to the polarity of solvent. When 2-EA and 9-PA were solubilized in aqueous CTAB, SDS and Brij 35 solutions, their average microenvironmental polarities were polar, and their microenvironmental polarity parameter showed little dependence on the ionic properties of the micelles. The average microenvironmental polarity of 2-EA was similar to the polarity of 40% (w/w) aqueous ethanol, and that of 9-PA was similar to the polarity between 30 and 40% (w/w) aqueous ethanol. It was found that the greater part of these species might be distributed at the surface of micelles when they were solubilized in aqueous micellar solutions. The methanol-water mixture solution appeared to have characteristics more favorable for photooxidation reaction than aqueous micellar solutions.
金現哲(Hyun-Cheol Kim),吳亨植(Hyung-Sik Oh),金長睦(Jang-Mok Kim),金喆遇(Cheul-U Kim) 대한전기학회 2007 전기학회논문지 Vol.56 No.12
The simulation model has been already developed not for 7 phase but for 3 phase BLDC motor. It is necessary to develop a new simulation model of multi-phase BLDC motor including the phase delay angle especially in the high speed region. In this paper, the suitability of the proposed model is verified through the several computer simulations, and experimented results.