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유도공기 및 에어커튼을 이용한 주방 레인지후드 성능 개선에 관한 수치모사
손덕영(Deok-Young Sohn),임지홍(Ji-Hong Lim),최윤호(Yun-Ho Choi),박재훈(Jae-Hoon Park) 대한설비공학회 2007 설비공학 논문집 Vol.19 No.4
In an apartment house that is generally air-tight and well insulated, the combustion gas from cooking devices is the major source of air pollution in the kitchen. It spreads throughout the house affecting the overall indoor air quality. In this study, the performance of the kitchen range hood which employs air induction and air curtain was investigated by numerical simulation. The results are compared with that of two other kitchen range hoods which are in general use. The two general types of range hoods considered in the present calculations are box and plate type range hoods. The former has a large capture space between the filter and suction duct, while the latter has little. It was found that the capture efficiency of the kitchen range hood with air induction and air curtain is higher than that of the general types of range hoods by 20% approximately. The reason may be because the air induction and the air curtain block the air stream escaping from the front and the side part of range hoods effectively and because an additional fan for air induction and air curtain increases suction flow rates.
반근수(Keun Soo Ban),박준규(Jun Kyu Park),정광석(Kwang Suk Jung),이상헌(Sang Heon Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Planar stage based on induction principle is suggested to effectively cope with such severe request as large workspace in the flat panel display manufacturing etc. The system consists of the array type of four transverse flux linear induction motors, and its moving part is levitated by the porous media air bearings to counterbalance a strongly attractive force under low frequency band. First, this paper gives an overview of trends in the existing stage technologies. And then, the overall layout of the suggested system is described and a novel vector control method is given to complement a poor characteristic of low-speed actuation.
선형 유도기 구동 방식 공기 베어링 스테이지에 관한 연구
정광석(Kwang Suk Jung),심기본(Ki Bon Shim) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.6
Linear induction motor is adopted as an actuator of the planar stage. An inherently poor characteristic at zero or ultra-low speed zone of the induction motor is remarkably improved due to a recent development of power electronic semiconductor technology and a spatial vector control theory. At present, a servo response speed of the induction motor reaches 90 percent of one of PM synchronous or BLDC motor. Specially, as a secondary of the induction motor can be constructed using uniform conducting sheets, there is no periodic force ripple as in PM motors. So, the induction motor can be superior to another driving means under a certain condition. This paper discusses the overall development procedure of non-contact planar stage with a big workspace using linear induction motors.