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김우현,이무영,마진석,권우현,윤경섭,김승민 경북대학교 전자기술연구소 1998 電子技術硏究誌 Vol.19 No.1
In this paper, we developed the simulation model for the induction motor using SIMULINK in MATLAB. The induction motor model is based on the voltage, current and flux linkage equations on the arbitrary reference frame. The constructed model is very user friendly and its parameters may be changed continuously. We also developed the simulation model for the indirect vector controller and the current regulated PWM(CRPWM) voltage source inverter(VSI).
김우현,이무영,권우현,윤경섭,마진석 경북대학교 전자기술연구소 1997 電子技術硏究誌 Vol.18 No.2
In this paper, a new PWM rectifier which offers a unity power factor is proposed. This circuit has the same inductance as the conventional PWM rectifier in powering mode, but it has less inductance in freewheeling mode. Because the time period of freewheeling mode is shorter than that of conventional PWM rectifier, a discontinuous input current is easily obtained. Therefore the rectifier accomplish as a unity power factor in wider range of duty ratio and boosting factor. We analyzed each mode of the proposed PWM rectifier, and proposed optimal design methods. We prove the advantages of the proposed PWM rectifier by comparing it with the conventional PWM rectifier through mathmatical analysis and simulation.
최일,이무영,권우현,윤경섭 경북대학교 전자기술연구소 1997 電子技術硏究誌 Vol.18 No.1
In this paper, the theory and methods that need to estimate the plant model are considered to design the controller of Bohyunsan 1.8m optical telescope servo system. To estimate the plant model of the altitude axis, we gather the experimental data in real operating condition. And we estimate the plant model using ARMAX, BJ model in ready-made approach with SIMULINK in MATLAB. And we verify by comparing step responses of the obtained models, theoretical model and experimental step response data of real system. Therefore, it is possible to design more accurate servo controller than before by using obtained model in real operating condition.