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직접 토크 제어를 이용한 리럭턴스 동기 전동기의 쵀대 효율제어
박홍일(Hong-il Park),김남훈(Nam-Hun Kim),최경호(Kyeon-Ho Choi),김동희(Dong-Hee Kim),김민희(Min-Huei Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper presents an implementation of direct torque control(DTC) of Reluctance Synchronous Motor(RSM) with an efficiency optimization using the 32M DSP TMS320C31<br/> The influence of iron loss can not neglected as high speed and precision torque control of RSM, so the optimal current ration between torque current and exiting current analytically derived to drive RSM at maximum efficiency. For RSM, torque dynamics can be maintained even with controlling the flux level because the generated torque is directly proportional to the stator current The experimental results for an RSM are presented to validate the applicability of the proposed method The developed control system is shown high efficiency features with l.0Kw RSM having 257 ratio of d/q reluctance.
직류 전원 분할용 커패시터의 용량변화가 복공진형 고주파 인버터의 특성에 미치는 영향
원재선(Jae-Sun Won),박홍일(Hong-Il Park),이경호(Kyung-Ho Lee),조규판(Gyu-Pan Cho),김동희(Dong-Hee Kim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
A half bridge type double resonant high frequency resonant inverter using PFM is described. This proposed inverter can reduce distribution of the switching current because of using the current of the serial resonant circuit to the input current of the parallel one. In the case of variable capacitance of the DC voltage source separated capacitor, the analysis of inverter circuit has generally described by using normalized parameter and operating characteristics has been evaluated in terms of switching frequency and parameters. Based on the characteristics value, a method of the circuit design is proposed. The theoretical results are in good agreement with the experimental ones. In the future, this proposed circuit is considerated to be useful for induction heating and discharge lamp.
Reactive Ion Etching에 의한 ITO/반도체 및 ITO/BaTiO3 구조의 선택적 에칭 특성
한일기,이윤희,김회종,이석,오명환,이정일,김선호,강광남,박홍이,Han, Il-Ki,Lee, Yun-Hi,Kim, Hwe-Jong,Lee, Seok,Oh, Myung-Hwan,Lee, Jung-Il,Kim, Sun-Ho,Kang, Kwang-Nham,Park, Hong-Lee 대한전자공학회 1995 전자공학회논문지-A Vol.32 No.1
Eteching characteristics of the Indium Tin Oxide (ITO), which is transparent conductor, was investigated with CH4/H2 and Ar as etching gases for the Reactive Ion Etching (RIE). With CH4/H2 for the etching gas, the highly selective etching characteristics for the ITO on GaAs was obtained. It was examined that the dominant etching parameter for the selective etchning of ITO on GaAs structure was the chamber pressure. But, the etching selectivity for ITO on InP was poor eventhough we tried systematic etching. RIE etching conditins using CH4/H2 gas was limited due to the formation of polymer on the substrates. In the case of Ar gas for the reactive gas, the selectivity of ITO on BaTiO3 was above 10. The etch rete of ITO was more sensitive to the etching parameters than that of BaTiO3, which was almost constant with different etching parameters.
Nb/Fe-C-(Si) 주조접합재에서 등온열처리시 계면반응층의 성장에 관한 연구
정병호 ( Jeong Byeong Ho ),김무길 ( Kim Mu Gil ),정상훈 ( Jeong Sang Hun ),박홍일 ( Park Hong Il ),안용식 ( An Yong Sig ),이성열 ( Lee Seong Yeol ) 한국열처리공학회 2003 熱處理工學會誌 Vol.16 No.5
N/A In order to study the interfacial reaction between Nb thin sheet and Fe-C-(Si) alloy with different chemical compositions, they were case-bonded. The growth of carbide layer formed at the interface after isothermal heat treatment at 1173K, 1223K, 1273K and 1323K for various times was investigated. The carbide formed at the interface was NbC and the thickness of NbC layer was increased linearly in proportional to the heat treating time. Therefore, It was found that the growth of NbC layer was controlled by the interfacial reaction. The growth rate constant of NbC layer was slightly increased with increase of carbon content when the silicon content is similar in the cast irons. However, as silicon content increases with no great difference in carbon content, the growth of NbC layer was greatly retarded. The calculated activation energy for the growth of NbC layer was varied in the range of 447.4-549.3kJ/㏖ with the compositions of cast irons.