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2상 SPMSM을 이용한 In-Wheel Motor의 신뢰성 평가
김영기(Y.K. KIM),김상훈(S.H. KIM),김학원(H.W. KIM),오홍석(H.S Oh),김형철(H.C Kim),목형수(H.S. Mok) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
본 논문에서는 In-Wheel System의 핵심 부품인 2상 SPMSM을 적용한 In-Wheel Motor의 신뢰성을 평가 하였다. 여기서 In-Wheel System은 고성능의 전기모터를 Wheel에 직접 장착하여 파워트레인 요소를 모두 제거함으로써 차량 시스템의 효율을 높이고, 추후 친환경 차량에 적용할 수 있는 신개념의 플랫폼을 제공할 수 있는 고효율, 고성능 차량 시스템이다. 그리하여 이 In-Wheel System의 가장 중요한 부품 중 하나인 동기모터를 DC 링크전압 이용률을 높이기 위해 2상 PMSM을 적용하였다. 따라서 본 논문에서는 2상 SPMSM을 적용한 In-Wheel Motor를 제작하였고, 이 Motor의 신뢰성 평가 중 하나인 내구 수명인 수만 시간에 대한 검증 방안을 In-Wheel Motor의 운전 조건으로부터 가감속 토크 및 실효토크를 계산해서 이를 바탕으로 가속수명시험을 하여 시험시간을 단축하고, 또한 In-Wheel Motor의 신뢰성을 검증하는 방법을 제안하였다.
영구자석 동기전동기용 전압원 인버터의 전압왜곡 분석 및 On-line 보상
김학원(H.W.Kim),윤명중(M.J.Youn),조관열(K.Y.Cho),김정철(J.C.Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
In a PWM VSI, the voltage distortion exists between the reference and output voltage. This distortion is caused by the intended blanking time and the inherent characteristics of the switching devices which are function of the operating condition In This paper, the dead-time effects are analysed and a new on-line estimation method for a PMSM is proposed to compensate time varying dead-time effects.
Application of CO₂ Technolgy in Nuclear Decontamination
박광헌(K. H. Park),김학원(H. W. Kim),김홍두(H. D. Kim),고문성(M. S. Koh),류정동(J. D. Ryu),김양은(Y. E. Kim),이범식(B. S. Lee),박현택(H. T. Park) 한국표면공학회 2001 한국표면공학회지 Vol.34 No.1
Green technology is being developed up to a point that is feasible not only in an environmental sense, but also in an economical viewpoint. This paper introduces two case studies that applied CO₂ technology into nuclear industry. 1) Nuclear laundry: A laundry machine that uses liquid and supercritical CO₂ as a solvent for decontamination of contaminated working dresses in nuclear power plants was developed. The machine consists of a 16 liter reactor, a recovery system with compressors, and storage tanks. All CO₂ used in cleaning is fully recovered and reused in next cleaning, resulting in no production of secondary nuclear waste. Decontamination factor is still lower than that in the methods currently used in the plant. Nuclear laundry using CO₂ looks promising with technical improvements-surfactants and mechanical agitation. 2) CO₂ nozzle decontamination: An adjustable nozzle for controlling the size of dry ice snow was developed. Using the developed nozzle, a surface decontamination device was made. Human oils like fingerprints on glass were easy to remove. Decontamination ability was tested using a contaminated pump-housing surface. About 40 to 80% of radioactivity was removed. This device is effective in surface-decontamination of any electrical devices like detector, controllers which cannot be cleaned in aqueous solution.
초음파를 이용한 초임계 이산화탄소 에멀젼내 Ni 전해도금
고문성(M. S. Koh),주민수(M. S. Joo),박광헌(K. H. Park),김홍두(H. D. Kim),김학원(H. W. Kim),한성호(S. H. Han),Nobuaki Satoc 한국표면공학회 2004 한국표면공학회지 Vol.37 No.6
Emulsions were formed through putting small quantity of nickel electroplating solution into supercritical carbon dioxide, and then electroplating in the sc-CO₂ emulsions was conducted. It is an environmental-friendly technology that can solve the treatment of a large quantity of toxic plating wastewater, which is a big problem in the existing wet plating, and also can reduce secondary waste generation fundamentally. Supercritical carbon dioxide emulsions enhanced by ultrasonic horn were formed by non-ionic surfactant and nickel solution. Plating condition within emulsions was set up as 120bar and 55℃ through measurement of electrical conductivity following the pressure change. Experiments were conducted respectively against supercritical carbon dioxide emulsions electroplating and general chemical electroplating, and then their results were compared and analyzed. As the experiment result utilizing emulsions, plating surface was formed very evenly even with a small quantity of electroplating solution, and fine particles were plated compactly without any pinhole or crack due to hydrogenation, which occurs in general electroplating. Used electroplating solution can be reused through recovery process. Therefore, this technology will be able to be applied as new clean technology in electroplating.