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모델기준적응시스템(MRAS) 기반의 부하토크관측기를 이용한 유도전동기 속도제어
김은기(E. G. Kim),이훈구(H. G. Lee),이승환(S. H. Lee),오봉환(B. H. Oh),정춘병(C. B. Chung),함년근(N. G. Hahm),전기영(K. Y. Jeon),이상현(S. H. Lee),한경희(K. H. Han) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper investigates a speed sensorless control of induction motor. The control strategy is based on MRAS (Model Reference Adaptive System) using load-torque observer as a reference model for flux estimation. The speed response of conventional MRAS controller characteristics is affected by variations of load torque disturbance. In the proposed system, the speed control characteristics using a load-torque observer control isn't affected by a load torque disturbance. Simulation results are presented to prove the effectiveness of the adaptive sliding mode controller for the drive variable toad of induction motor.
김은기(E. G. Kim),이재훈(J. H. Lee),전기영(K. Y. Jeon),이승환(S. H. Lee),오봉환(B. H. Oh),이훈구(H. G. Lee),김용주(Y. J. Kim),한경희(K. H. Han) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
The rotor speed and flux information is most important in the vector control. The accuracy of flux observers for induction machine inherently depends on parameter sensitivity. The control strategy is using online flux observer for flux estimation. In the proposed system, the speed control characteristics using a online flux observer control isn't affected by a load torque parameter disturbance. Simulation results are presented to prove the effectiveness of the adaptive sliding mode controller for the drive variable load of induction motor.
이재훈(J. H Lee),김은기(E. G Kim),전기영(K. Y Jeon),전지용(J. Y Chun),이승환(S. H Lee),오봉환(B. H Oh),이훈구(H. G Lee),한경희(K. H Han) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
In this paper, The authors design the current controller which independently control the d, q axis current transformed by the synchronously rotating d, q axis and a Space Vector Pulse Width Modulation(SVPWM) to steadily control the output DC-Link voltage against the variable load of the three phase PWM converter. Also, This study improves the high power factor, stability, and rapid response by the phase angle control using the digital Phase Locked Loop(PLL).
극배치 제어기법을 이용한 자기부상열차용 전원장치에 관한 연구
정춘병(C. B. Chung),이상현(S. H. Lee),김은기(E. K. Kim),조정민(J. M. Jo),전기영(K. Y. Jeon),강승욱(S. O. Kang),김용주(Y. J. Kim),한경희(K. H. Han) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
When the magnetic levitation system(MAGLEV) initially rise, The MAGLEV has a weak point that is very large variation of the electric current. In this paper, The author applied the multi-loop-control to stably control the magnetic levitation system(MAGLEV). The gains of the control algorithm were selected based on pole locations formulated from a prototype Bessel transfer function model. The design incorporate tradeoffs in DC-to-DC converter hard-ware para -meters and pole locations. In order to confirm the superiority of the proposed pole selection and controller, MATLAB simulation and experiment results are presented.
실시간 운영체제 환경하에서 이중화된 제어시스템을 위한 소프트웨어의 구현
박세화(S.-H. Park),황동환(D.-H. Hwang),이재혁(J.H. Lee),김병국(B.K. Kim),변증남(Z. Bien),문봉채(B.C. Moon),김은기(E.K. Kim) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
In this paper, a method for implementing software for the control system with dual structure in processor module is proposed and implemented to enhance its reliability. In this implementation the multi-tasking function which is provided by a real-time operating system is applied. The overall software is divided into five tasks and is performed in each of the dual processor module, independently. By this, the processor module with dual structure can achieve a control objective and fault diagnostics effectively. An experimental result shows that the backup processor module can be substituted for the primary processor module immediately when it happens to fail, because data relating the failure information are exchanged continuously done via shared memories.
金銀基,宋京燮,成宇鏞 대한한방성인병학회 1996 韓方成人病學會誌 Vol.2 No.1
The climacteric has been one process which woman and man have to pass through. In West, the menopause which is one of woman climacteric syndromes is regarded to be generated from hormone deficiency, while in East it has been recognized as the exhaustion of 'Cheongae' and therefore as a natural symptom. If menstruation appears when menopause has to arise, it is in Oriental medicine recognized as a disease and an intensive cure is required. Of symptoms related to menopause in Oriental medicine, representave ones are Kyungsookwagibuji (continual menstruation after the period of menopause has already passed; that is late menopause), Kyungdanhuburae (reproduced menstruation after a long time when it paused) and Nyeonminokyungsudan (ceased menstruation before the period of menopause; that is early menopause). Kyungsookwagibuji is recognized to be a disease which requires cure except the case of blood remainder. Kyungdanhuburae, as well, is recognized to be a symptom of intermittent bleeding before perfectly reaching menopause and it requires an intensive cure in case of menstuation reproduced after several years when menstruation ceased. Nyeonminokyungsudan is originated from endocrine deficiency.