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정연택,장성칠 明知大學校 産業技術硏究所 1993 産業技術硏究所論文集 Vol.12 No.-
The disseration presents the new strategy for controlling the torque of induction motors without speed sensors. Torque-producing current and flux-producing current are related to the active and reactive components of the input power, respectively Active and reactive power can be calculated obviously with stator voltage reference frame. Therefoer. stator voltage axis is used as reference frame, and the torgue and flux producing currents are derived from the reactions of the two input pawer components. If the d-axis flux is fixed, constant torge characteristics can be obtained without speed detection by conrolling torgue producing current. To implement the proposed control strategies, int'l 8097 BH16 bits microprocessor is used.
PFM方式 直列形 dc-dc Converter에 關한 硏究
鄭然澤,金洪喆 명지대학교 1976 明大論文集 Vol.9 No.-
This paper described the circuits of self-commutated dc-dc converter by the PFM method. The circuit is composed with a smoothing circuit and a thyristor triggered by a UJT relaxation oscillator. The result is that the output voltage of this device can be adjusted more stably by the pulse frequency of the oscillator than that of other methods.
회전접촉자 SCR 주파수 변환기에 의한 3상 유도전동기 제어에 판한 연구
정연택 명지대학교 1977 明大論文集 Vol.10 No.-
The paper attemps to make time domain analysis of a 3 phase induction mator supplied by the SCR frequency convertor with a rotating distributor. In the steady state analysis, the mathematics can be reduced to a two point baundary-value problem, a solution of which is given.
한경희,강승욱,김용주,정연택,이승환 明知大學校 産業技術硏究所 1994 産業技術硏究所論文集 Vol.13 No.-
Recently, the speed control of electric motorcar usually adapts the chopper control method by the development of power electronics and semiconductor manufacturing techniques. When the chooper control is adapted to the speed control of electric motorcar. D.C.series motor is mostly used because of the large starting torques and good control characteristics. But with respect to the economy, D.C. separately excited motor with shunt characteristics is profitable because of high adhesivesness and consumption. So, we compare the characteristics of the bilateral variable-ratio chopper controlled D.C. separately exited motor with that of the D.C. series motor theoretically and experimentally, and present the method which is able to simplify the main chopper circuit by selecting among the forward powering, forward regenerative braking, backward powering, and backward regenerative braking only by using the main chopper control signal. Also, control method is studied which has similar driving characteristics to that of the gasoline motorcar.
誘導電動機의 驅動을 위한 負荷轉流型 인버터에 관한 硏究
소용철,이우춘,정연택 明知大學校 産業技術硏究所 1991 産業技術硏究所論文集 Vol.10 No.-
Investigation of the driving range of the induction motor which is operated by using a load commutated inverter has been carried out in this paper. It is shown that capacitance of the commutation capacitor can be reduced by the forced-com-mutation driving up to a half range of normal frequency in the low frequency in the low frequency range when to start the motor drive.
VECTOR CONTROL OF INDUCTION MOTOR WITHOUT THE DETECTION OF ROTATIONAL SPEED
Yon-Tack Chung,Sa-Young Lee,Chang-Seop Shin,Myong-Ji University 전력전자학회 1992 ICPE(ISPE)논문집 Vol.1992 No.4
In this paper, the vector control of induction motor without speed sensor by means of voltage source power converter is described. Control 1 ing torque through the estimation of input frequency by slip, the speed controller with two control loops of torque control and constant speed operation by the positive feedback of slip is composed of. The pulse width modulation technique is proposed in order to enlarge a variable range of motor driving voltage, and the excel lent characteristic is obtained by vector control .<br/>
The Triple Current Source Inverter System for Induction Motor Drive
YON-TACK CHUNG,LAK-HOON WHANG,SEONG-CHIL JANG 전력전자학회 1989 ICPE(ISPE)논문집 Vol.- No.-
In propotion to the capacity of induction motor contollea by current source inverter, the capacitance of the commutation capacitor is enlarged and spike value of output vlotage is incieased at the moment of charge and discharge.<br/> Therefore, a number of harmonic components of output voltage is increased. A current-fed inverter involves a number of harmonic components of output current. These lead to a bad effects on performance of induction motor.<br/> We study such as,<br/> CD The method of triple(18 phase multiplex) High Frequency Current Source Inverter (HFCSI) is applied in order to restrain a number of harmonic components contained in output current.<br/> (2) The method of Voltage Clamping Circuit(VCC) is applied in order to restrain the spike value of output voltage.<br/> From these methods,the improved output waveforas in the current-fed inverter are presented.<br/> At the results of using a sngle chip microcontroller(INTEL 8751), control circuit is simplified and control flexibility is improved in triple CSI. And these results are presented in this paper.
A STUDY ON TWO PHASE CHOPPER SYSTEM WITH FOUR SEPARATE GROUPS OF D.C MOTORS IN REGENERATIVE BRAKING
YON-TACK CHUNG,KYUNG-HEE HAN,YONG-JOO KIM,SEUNG-WOOK KANG,SEUNG-HWAN LEE 전력전자학회 1989 ICPE(ISPE)논문집 Vol.- No.-
Two phase chopper system with four separate groups of DC motors for regenerative braking is in this study The main circuit consists of four sets of chopping parts, eight diodes and four separate groups of D.C motors Although the proposed chopper circuit requires more circuit elements than the conventional two phase chopper system with combined output, it has the following advantages, (1) The region of regenerative braking becomes twioe as that of the conventional two phase chopper system.<br/> (2)Current division of load becomes equalized Therefore, it is possible to drive not only series motors but also shunt and separately excited motors.