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SRM 구동을 위한 Energy Efficient C-Dump 컨버터에 관한 연구
최준혁(J.H. Choi),윤용호(Y.H. Yoon),송병섭(B.S. Song),원충연(C.Y. Won),김규식(G.S. Kim),최세완(S.W. Choi) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.-
This paper compared a Modified C-dump converter and energy efficient converter topologies, derived from the conventional C-dump converter, for switched reluctance motor (SRM) drives The proposed topologies overcome the limitations of the conventional C-dump converter, and could reduce the whole cost of the SRM drive. Also, the above converters have simple control requirements, and allow the motor phase current to free wheel during chopping mode. Specially, the voltage ratings of the dump capacitor and some of the switching devices in the proposed an Energy efficient C-dump converter is reduced to the supply voltage (V-dc) level compared to twice the supply voltage (2V-dc) in the conventional C-dump converter. Simulation and experimental results of the proposed converters are presented and verified.<br/> <br/>
핫가스 바이패스방식에 의한 공작기계용 오일쿨러의 정밀 온도제어
변종영 (J. Y. Byun ),최준혁 (J. H. Choi ),문춘근 (C. G. Moon ),윤정인 (J. I. Yoon ),정석권 (S. K. Jeong ) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
Recently, technical trend in machine tools is focused on enhancing of speed and accuracy. The high speed usually causes thermal displacement and structural deformation of objects of the machine tool. To minimize thermal effect, machine tools adopt oil coolers with precise temperature control function. This study aims at precise control of oil outlet temperature in the oil coolers with hot-gas bypass based on PI control logic. The control system was designed for obtaining steady state error within ±0.2°C even though abrupt disturbances are added. We showed that the gain of PI could be easily determined by using gain-tuning method without any numerical model. Through some experiments, excellent control performance was established by a simple PI controller.
산업용 냉각기의 열부하 변화에 대응한 정밀온도제어 특성
백승문(S. M. Baek),최준혁(J. H. Choi),변종영(J. Y. Byun),문춘근(C. G. Moon),정석권(S. K. Jeong),윤정인(J. I. Yoon) 한국동력기계공학회 2010 동력시스템공학회지 Vol.14 No.2
Recently, technical trend for machine tools is focused on enhancement of speed and accuracy. High speedy processing causes thermal and structural deformation of objects from the machine tools. Water cooler has to be applied to machine tools to reduce the thermal negative influence with accurate temperature controlling system. Existing On-Off control type can’t control temperature accurately because compressor is operated and stopped repeatedly and causes increment of power consumption and decrement of the expected life of compressor. The goal of this study is to minimize temperature error in steady state. In addition, control period of an electronic expansion valve were considered to increment of lifetime of the machine tools and quality of product with a water cooler. PI controller is designed using type of hot-gas bypass for precise control of temperature. Gain of PI is decided easily by method of critical oscillation response, excellent performance of control is shown with 4.24% overshoot and ±0.2℃ error of steady state. Also, error range of temperature is controlled within 0.2℃ although disturbance occurs.