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이상용(S.Y. Lee),강병희(B.H. Kang),채영민(Y.M. Chae),목형수(H.S. Mok),초규하(G.H. Choe),김덕근(D.K. Kim),류재성(J.S. Ryu) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
A brushless DC motor has the high quality of torque output and silence, has been more widely used in industrial area. As the driver and controller of BLDC motor have been more complicated and precise, simulation method has been much used m motor design. And the output characteristics of BLDC motor is determined by the waveform of BACK-EMF in instinct. But because the conventional model of BLDC motor is obtained by approximation of real nonlinear waveform to ideal trapezoidal waveform, the error is occurred in slmulation result. Thus in this paper, for the correction of this error in simulation, the model of real nonlinear waveform considered is proposed, and the simulation result is obtained in case of three-phase, four-poles Y-connected, surface mounted permanent magnet BLDC motor.
채영민(Y.m. Chae),조종화(J.h. Cho),권중기(J.g. Kwon) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
In this paper, a new self-oscillated type high voltage charger controller circuit is proposed, which has variable constant current source characteristics to Improve charge characteristic of charger roller. The proposed control method enables high quality printing characteristics regardless of the circumstance change such as ambient temperature or humidity by changing the current reference signal To verify the proposed control method various experiments are performed.
채영민(Y.M Chae),고재석(J.S Gho),최해룡(H.R Choi),김진욱(J.W Kim),최규하(G.H Choe) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
One of the drawbacks of using diode-bridge rectifiers in the unity interface, is the line-current harmonic distortion caused by the nonlinear nature of the rectifier operation. So, a PWM converter for the power factor correction is analysed in this paper. The proposed converter is selected for unity power factor as well as low cost design, which enable to meet the limits of international standards.
CO₂용접기의 대전류영역에서의 단락이행 유도에 의한 용접성능개선에 관한 연구
채영민(Y.M Chae),고재석(J.S Gho),구자열(J.Y Goo),최규하(G.H Choe),목형수(H S. Mok),김규식(K S. Kim),원충연(C.Y Won) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
The metal transfer of CO₂ arc welding machine can be devided into short-circuit(low current) and globular(large current) metal transfer. Especially in large current region, the main problem of CO₂ arc welding machine is much spatter generation which is caused by mainly instant short-circuit metal transfer. So in this paper descrives new current control method in large current region, which can improve welding performance and lessen spatter generation And as a result of experiment, the effect of proposed control method is demonstrated.<br/> <br/>
순시출력전류 제어기법에 의한 인버터 아크 용접기 특성에 관한 연구
김진욱(J.W Kim),채영민(Y.M Chae),고재석(J.S Gho),목형수(H.S. Mok),최규하(G.H Choe) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
Recently the performance of CO₂ arc welding machine has been advanced significantly through the adoption of inverter circuit topology which made it possible to control the waveform of welding current and thus to suppress the spatter generation However, the optimum waveform is still uncertain. As a first step for figuring out the promising waveforms, this study was performed to set-up the experimental system for study the effect of waveform variables The overal system is controlled digital controller using single chip microprocessor of 80C196KC. As a result of performance test of this system, it was demonstrated all of the waveform variables could be set individually and the generated spatter is reduced compare to conventional inverter arc welding machine.<br/> <br/>
단락순간의 전류제어에 의한 CO₂ 인버터 아크 용접기의 스패터 저감
고재석(J.S Gho),채영민(Y.M Chae),이승요(S.Y Lee),목형수(H.S Mok),최규하(G.H Choe) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
The conventional CO2 inverter arc machine has constant voltage output characteristics and uses constant wire speed controller for welding current control By adoption of PWM inverter to the welding machine, the spattering was reduced rather than the thyrister arc welding machine or AC arc welding machine Moreover, by the high switching frequency, the output reactor size could be reduced evidently<br/> Recently, the studies on optimal voltage and current waveform for the welding performance Improvement have been studied. In this paper, a new instantaneous output current control scheme during the short circuit mode was proposed and showed the capability of arc stability improvement and the reduction of spatter generation.
인버터 아크용접기를 위한 3상 승압/강압형 컨버터의 운전특성비교
최해룡(H.R. Choi),구영모(Y.M. Goo),채영민(Y.M. Chae),최규하(G.H. Choe),목형수(H.S. Mok),김규식(K.S. Kim),원충연(C.Y. Won) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
Three phase Boost/Buck converter which have economical merits and simple control scheme, are analyzed and evaluated through comparative methods and digital simulation for equivalent load Those play a part of voltage boost/buck as well as power factor correction with single switch. Controller operating in constant and variable frequency is used for rapid output response and stable system condition respectively Moreover low THD property of single switched converter is available for inverter arc welding machine known as high power and low power factor. So in this paper a comparison of the characteristics in boost and buck converter is described and then simulation results conforms the merits from the point of view of power factor and voltage regulator.<br/> <br/>