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유도전동기의 파라미터 변동을 보상하기 위한 전압제어모델의 벡터제어
정동화 순천대학교 공업기술연구소 1992 工業技術硏究所論文集 Vol.6 No.-
For the propose of high performance operation of an induction motor, many studies on the vector control have been promoted. In the vector control scheme, in which the motor currents are controlled by the use of a motor current model, the variation of the rotor flux interlinkage and the deviation of actual torque from command torque, which are caused by the change of stator and rotor winding resistance, are large. Therefore, for high performance operation, it is necessary to compensate the variation and the deviation above. In the Voltage Model Vector Control System, where the voltages are controlled, the variation of the rotor flux-interlinkages according to the change of the rotor resistance is very small, however the deviation of the torque becomes large. In this paper, the voltage model based vector control scheme having d, q current loops eliminated harmonic components to enhance the torque performance and PWM technique to realize on-line real time control are proposed, so the full digitalization becomes possible.
컨버터로 제어되는 유도전동기 드라이브 시스템의 손실 모델링
정동화,이정철,박기태,이홍균 순천대학교 1999 순천대학교 자연과학논문집 Vol.18 No.2
An accurate loss model of induction motor drive controlled by the converter is proposed. Steady state fundamental and hamonics loss characteristics, besides the dynamics of the machine are analyzed and incorporated in the model, resulting in a new synchronous frame dynamics d-q equivalent circuit. The converter system has been modeled accurately for condition and switching losses.
정동화 순천대학교 공업기술연구소 1995 工業技術硏究所論文集 Vol.9 No.-
엔코더를 사용한 전동기의 속도제어계에서 저속영역의 경우 엔코더의 펄스간격이 속도제어 주기보다 크게 되어 매 속도제어 주기마다 정확한 속도정보를 얻을 수 없다. 이 때문에 저속영역에서 속도제어계가 불안정하게 되어 속도제어 특성이 악화된다. 본 논문에서는 부하 토크 관측기를 사용하여 저속시의 순시 속도를 정확하게 추정하여 저 분해능의 엔코더를 사용하는 경우에도 저속에서 안정된 속도제어 특성을 얻는다. This thesis proposes a control method of induction motor at a low speed range. When an encoder is used for speed detection, we usually obtain speed information from the increased pulse number, At low speed range, however, we can get only average speed between encoder pulses and it makes speed controller unstable. By using a disturbance observer and torque current, it is possible to estimate accurate speed information. The simulation results show that the proposed algorithm enables to obtain the characteristics of the stable speed control at a low speed.
鄭東和 順天大學校 1997 論文集 Vol.16 No.1
The general control characteristics of several current controllers described in this paper are presented. In general, a PWM current controller swithes a pulse width modulated voltage source inverter to force the line current in a three phase load to follow a set of reference currents. The inherent limitations of commanding voltages and currents in a three phase load with an inverter are examined. Results from digital simulations of five different current controllers are presented. A switching diagram is developed which reveals some of the operating characteristics of hysteresis controller. A frequency domain analysis of a ramp comparison controller predicts the line currents that result and provides some insight into the compensation required to reduce the current errors. A hysteresis controller and ramp comparison controller are implemented in ac motor drive.
정동화 中央大學校 韓國敎育問題硏究所 2001 韓國敎育問題硏究所論文集 Vol.- No.16
It is necessary to investigate the concept and pattern of the organizational culture in order to offer basic materials inducing the profit gaining, the consumers' satisfaction. and the participation in the daily athletics by means of the understanding of the organizational culture in commercial sports centers . 1.An organization can be defined as a mediative system to accomplish its object by means of the division of labor and the hierarchy of Power, and so the culture has a microscopic meaning, which can be called the refinement of spirit. 2.The organizational culture has two opposite functions; one can be called a progressive for the systematic stability of a society; the other is a retrogressive function which can be thought a condition against an innovation. 3.For the accomplishment of the object, the organizational culture is made up of various forms of value. ideology, creature. strategy, members, circumstances, systems, rules. Consciousness, images, belief, symbols, attitudes, myth, and so on 4. The pattern of the organizational culture can be divided into two dimension; one can be said a maintenance-oriented and activity-oriented dimension; and the other intimate, progressive, conservative , reasonable dimension.
약계자 영역에서 SynRM의 MTPA를 위한 속도 센서리스 제어
정동화,이정철,이홍균 국립7개대학공동논문집간행위원회 2001 공업기술연구 Vol.1 No.-
In this paper, a new approach for the SynRM(Synchronous Reluctance Motor) control which ensures producing MTPA (Maximum Torque per Ampere) over the entire field weakening region is presented. In addition, This paper presents a speed sensorless control scheme of SynRM using flux observer. Also, by adjusting the base speed for the field weakening operation according to the flux level, the current and voltage limit, the smooth and precise transition into the field weakening operation can be achieved. The proposed scheme is verified validity through simulation.