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禹靖仁 釜山工業大學校 1978 論文集 Vol.19 No.-
A simulated Inductor is synthesized with a operational Amplifier, one capacitor and two resistors. This Inductor is variable by adjusting the value of Internal capacitor in the resonating circuit with in the frequency range of 1[KH??] to 100[KH??]. The Leq is about 100[mH]. This Inductor is very stable and experimental values agree with theoretical results.
禹靖仁,趙顯文 동아대학교 공과대학 부설 한국자원개발연구소 1984 硏究報告 Vol.8 No.2
This paper describs the analysis, design, and testing of a stepping motor drive system. The load variation, the characteristics of a driving current delay, or the shaft vibration from the ringing current of a phase transformation induces the step out of synchronism and the reversal of the stepping motor. This paper presents the design aspects of a position control of stepping motor which is fed from pulse generator. Author considered the dynamic characteristics and the computation of electrical constants with stepping motor. As a theoretical bases and a prediction of the experiments, the author considered the dynamic shaft response of stepping motor. Design examples and optimal driving conditions of high efficiency stepping motor are based on the improvement of the shaft vibration.
LIAPUNOV函數에 의한 同期電動機의 동기인입현상 解析
우정인,이준탁,윤병도 동아대학교 공과대학 부설 한국자원개발연구소 1987 硏究報告 Vol.11 No.2
A synchronous motor started as an induction motor must be synchronized as soon as possible by the application of field at any point. Unfortunately, the dynamic motion equations, describing the synchronized process, that is, describing the pulling-into-step process, are represented by complicate and nonlinear differential equations which have no analytical techniques. However, practical criteria for predetermining with adquate accuracy whether a given motor will or will not pull into step under specified conditions, must be necessarily given. Futhermore, it is impossible to obtain the accurate solution of the closed form by conventional techniques. Even though they are obtained, they does not show the stable regions over 4 quadrants. Specially, the accurate observations about the continuous variations of slip and load angle are very important for the stablized control of synchronous motor and all systems with them. The abnormal and unstable operations such as hunting pulling out and etc. are fatal to the life of machine itself and all systems with them. Therefore, in this paper, the stable regions in the sense of strictness over 4 quadrants, the analytical and the experimental techniques, for cylindrical synchronous motor are introduced in detail. These techniques used in this paper are based on the construction and analysis of Liapunov function, derived from the Lagrange-Char-pit method which is one of the solution techniques for partial differential equations. The theory of the various stable regions and optimal points for applications of field, which can be predicted the success or the failure of pulling-into-step under the variations of load ratio and damping ratio is presented and also is proved by experimental results.
우정인,안인모,노태균,신동률,박지호 동아대학교 건설기술연구소 1997 硏究報告 Vol.21 No.1
In this paper, a source current controlled-scope of PWM converter for Storage Battery is considered from one-phase equivalent circuit. And for the improvement of transient characteristics, the state quantity of converter current that is returned from its error is controlled. With the result of that the converter current is controlled, this state quantity is known that it is a equivalent braking resistor.
공진형 FB DC-DC 컨버터의 정출력 제어에 관한 연구
우정인,노인배,노태균,김구형,황영민 동아대학교 생산기술연구소 1999 生産技術硏究所硏究論文集 Vol.4 No.2
Due to the development of information communication field not only the industrial electric machinrye but also the electronic·communication machinry including the computer and satelite, the interests for SMPS are increasing. Thus the low loss converter which can be operated in high speed switching is require. In this paper, a control strategy for the constant output power of resonant FB DC-DC converter in variable input voltage is proposed. The proposed control of system is I-PD type control applying type 1 digital system. The output voltage tracks the reference without any steady state error even in variable input voltage. The validity of proposed control strategy is verified by simulations using PSIM.
공간벡터변조에 의한 반송용 편측식 선형유도전동기의 동특성에 관한 연구
우정인,조윤현,조용길,신동률,정영일 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.2
A Single-sided Linear Induction Motor(SLIM) has been developed for use in industrial machines, transportation, application to automations, because it has merits of direct driving and simple structure. The SLIM for conveyer system requires a soft start and stop, and no shock drive. The air gap of SLIM is large and the fluctuation of its distance while being operated has significant effect on the thrust of SLIM and cause the thrust ripple. Mecause of the effect of this thrust ripple, it is difficult to control the speed of SLIM precisely. In order to improve the problems maintenance above, in this paper, the Space Vector Modulation (SVM) with PI controller is proposed, which offers the dynamic characteristics of SLIM without the thrust ripple.
行列多項式 LYAPUNOV 函數 構成에 依한 誘導電動機의 安定度 解析
禹靖仁,李浚柝,文在星 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.2
In this paper, when the steady state values for Multidimensional and Nonlinear Dynamic Models of Space Representations are given, Lyapunov functions of scalar types using matrix quadratic polynomials are constructed by Special Matrix Transformation Techniques and applied to Stability Analysis of Induction Motors. Futhermore, Lyapunov function construction procedures for linear systems can be specified in detail. But, unfortunately, for nonlinear systems, there are no the complete construction techniques. Therefore, in this paper, differently from conventional methods using Linearization obtained from Taylor series expansions about steady state operating points, linear terms and nonlinear ones are invidually separated, and by special matrix transformation techniques, similar Lyapunov function construction procedures such as in the cases of linear systems, are introduced, and are applied to Stability Analysis of induction motor. The hyperspaces of multidimensional stability region, obtained from these techniques, were larger than the obtained ones from conventional linearlization techniques about equilibrium points and were assured to be Lyapunov Asymptotic Stability Region ensuring the stable operation of induction motor.