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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.
에탄올 혼합율이 가솔린 엔진의 배기와 성능에 미치는 영향
박홍일(Hongil Park),오승우(Seungwoo Oh),박권하(Kweonha park) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Rapid growth of automobile industry has become a major reason for energy consumption and environmental pollution around a large city seriously.<br/> Saving energy greatly effects on the countries that do not have energy sources, so saving energy and varying energy source are demanded.<br/> In this study, the effect of ethanol mixing rate on exhaust emissions, fuel consumption rate and engine torque is tested in a gasoline engine without any retrofit Mixing rate is varied from 0% to 85% and engine speed and torque are also varied. The result show ethanol mixing rate of 10 to 15% is considered as a suitable range in order to use the fuel without any retrofit Maximum torque is decreased with mixing rate increase, but the torque shows similar value is the range of 10 to 15% The values of CO, HC emission and fuel consumption are similar or slightly increased except the range of 10 to 15%.