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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.
태양전지 어레이를 위한 최대 전력점 추종기에 관한 연구
이상용(S.Y. Lee),김한구(H.G. Kim),오방원(B.W. Oh),김홍성(H.S. Kim),최규하(G.H. Choe) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
The output of solar array is changed non-linearly by variation of insolation and temperature. Hence, as varying insolation and temperature, Maximum Power Point Tracking(MPPT) is necessary to increase generation efficiency of solar array. This paper presented MPPT algorithm using position control of output voltage and current of solar array and implemented hardware MPP tracker which is appropriate and inexpensive for low power system(ten s~hundreds watt). Finally, those were verified through simulation.
계통연계형 태양광 발전시스템의 향상된 MPPT 알고리즘
이상용(S.Y.Lee),한찬영(C.Y.Han),고재석(J.S.Gho),최규하(G.H.Choe),목형수(H.S Mok) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
The photovoltaic systems with solar cell array provide electrical energy to the utility/consumers, which are becoming one of the promising energy substitutes. The photovoltaic system can be classified into two types: One is the stand-alone type. and the other utility interactive one. The latter can return the generated power' to the utility, but the former can't. The utility interactive systems are so valuable for peak power cut in summer season. In the photovoltaic systems the' maximum power point tracking (MPPT) has been studied for the increase of the generating energy of the photovoltaic system. There are many control methods of MPPT, but a new MPPT algorithm is proposed to overcome the disadvantages of the conventional ones, and as a result the proposed method enables to improve both tracking ability and generating efficiency of photo-system without DC chopper
이상용(S.Y Lee),김진봉(J.B Kim),엄문광(M.K Um),김병기(B.K Kim),김태욱(T.K Kim),신정우(J.W Shin) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Composites are being used for the aerospace industry. One of the reasons of using composites instead of existing materials is their potential to reduce weight of the structure. So this study is focused on the conceptual design of the composite torque link for helicopter landing gear parts, and the FE model was developed to check the feasibility considering composite laminates to be made through the RTM process. This conceptual model was verified by iterative design through linear & nonlinear static stress analysis by FEA under ultimate static load.