• Title/Summary/Keyword: DC 서보 전동기

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AC Servo Motor Control Using intelligent Observer (지능형 관측기 이용한 교류서보 전동기 제어)

  • Yoon, Kwang-Ho;Kim, Sang-Hoon;Kim, Lark-Kyo;Nam, Moon-Hyon
    • Proceedings of the KIEE Conference
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    • 2005.05a
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    • pp.69-71
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    • 2005
  • DC servo motors have a defect that they need a periodical maintenance because of a brush commutation and also they have a difficulty at high speed operation. In this reason, the use of AC Servo motors are increasing these days. In this paper, a proposed neuro observer is applied to speed control of AC servo motor. The proposed observer complement a problem that occur from increase of gain of High-gain observer in proportion to the square number of observable state variables. And also, the proposed observer can tune the gain obtained by differentiating observational error automatically by using the backpropagation training method to stabilize the observational speed. The excellence and feasibility of the proposed observer is proved by making a comparison test between the proposed observer and the others applied to the same AC servo motor.

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Design of Robust Adaptive Controller for the Improvement in Performance (응답 특성이 향상된 강인한 적응 제어기 설계)

  • Choi, J.B.;Byun, S.H.;Lee, J.H.;Jeong, C.G.
    • Proceedings of the KIEE Conference
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    • 1997.07b
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    • pp.667-671
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    • 1997
  • 본 논문에서는 적응제어계통의 강인성을 향상시키기 위한 새로운 알고리즘을 제시한다. 이 적응 알고리즘은 외란의 영향을 상쇄시키고 Lyapunov 도함수 $V{\le}0$가 되도록 한다. 그 결과로서 외란이 존재하는 경우만 아니라 이상적인 경우에도 출력오차가 0에 수렴한다. 또한 컴퓨터 시뮬레이션과 DC 서보 전동기의 위치제어 실험을 통하여 $e_1$ 변형법과 실험결과를 비교함으로써 제안한 알고리즘의 타당성을 보여준다.

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Optimal Design of Brushless DC Motor for servo drive (서보용 BLDC전동기의 최적설계에 관한 연구)

  • Kim, Jung-Chul;Park, Yong-Il;Cho, Yun-Hyun;Im, Tae-Bin;Seung, Ha-Kyoung
    • Proceedings of the KIEE Conference
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    • 1998.07a
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    • pp.179-182
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    • 1998
  • This paper is proposed a selection method of the major design dimension which constrain the maximum acceleration capability and minimum power loss of surface-mounted brushless do motor with NdFeB permanent magnet for servo drives. Expressions are derived from the air-gap flux density and the linear current density around the stator periphery and design dimensions. The linear current density is limited by the need to avoid demagnetization. In this paper, We compute the optimum design dimensions of 2KW BLDC motor with maximum acceleration capability and minimum power loss by using genetic algorithm.

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Adaptive Fuzzy Controller for Speed Control of Servo Motor (서보 전동기 속도 제어를 위한 적응 퍼지 제어기)

  • Son, Jae-Hyun;Roh, Cheung-Min;Kim, Lark-Kyo;Nam, Moon-Hyon
    • Proceedings of the KIEE Conference
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    • 1995.07b
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    • pp.947-949
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    • 1995
  • In this paper, model reference adaptive fuzzy controller (MRAFC) was proposed in order to overcome the difficulty of extracting rules and defects of the adaptation performance in the FLC. MRAFC comprised inner feedback loop consisting of the FLC and plant, and outer loop consisting of an adaptation mechanism which is designed for tuning a control rule of the FLC. A reference-model was used for design criteria of a fuzzy controller which characterizes and quantizes the control performance required in the overall control system. Tuning control rules of FLC is performed by the adaptation mechanism. For this, the fuzzy model for tuning the contorl rules is designed in accordance with the feature of error information. And DC servo motor was selected for case study of actual industrial plant and tested on various loads.

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Position Control of DC Servo Motor Using Neural Network Controller (신경 회로망 제어기를 이용한 직류 서보 전동기의 위치제어)

  • Lee, Joon-Tark;Lee, Kwon-Soon;Lee, Sang-Seuk;Park, Cheul-Young
    • Proceedings of the KIEE Conference
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    • 1993.07a
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    • pp.241-243
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    • 1993
  • In this paper, a class of neural-network controllers with two inputs of error and error change, is applied to the position control of D.C. servo system. The proposed controller is learned by error back-propagating error information to compensate the weighting value using its previous derivatives and to decrease exponentially a series of self learning coefficients. Through the simulations and implementations, the effectiveness and superiority to the conventional fuzzy controller is proved.

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Design and Dynamic Analysis of Permanent Magnet Linear Synchronous Machine for Servo Application (서보 시스템 적용을 위한 직선형 영구자석 동기 전동기의 설계 및 동특성)

  • Jang, Seok-Myeong;You, Dae-Joon;Jang, Won-Bum;Park, Ji-Hun
    • Proceedings of the KIEE Conference
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    • 2005.10c
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    • pp.135-137
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    • 2005
  • In servo system demanding precision dynamic characteristics, application of the Permanent Magnet Linear Synchronous Machines (PMLSM) has advantage of analysis convenience by simple geometry and thrust ripple reduction from the sinusoidal back electromotive force and excited stator. Therefore, this paper presents design of surface-mounted PMLSM with slotless iron cored stator according to coil turns to satisfy the rate thrust. Also, from dynamic analysis for servo application of manufactured motor with heavy mass, we offer accurate range of the DC link voltage and acceleration in rate speed. This is applied to speed reference profile considering system characteristics in total length of moving position.

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A Study on the Reversible SCR Servo Amplifier (정역전이 가능한 SCR 서보증폭기에 관한 연구)

  • Ahn, B. W.;Park, S. K.
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.31 no.2
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    • pp.190-198
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    • 1995
  • Many industrial servo amplifiers employ power transister as output device. Thyristor converters are not adopted to drive servo motor, although thyristor is superior to power TR in power rating, noise immunity, price, and size. The reason is, thyristor has no ability of self turn - off. Here in this paper line commutation, in which thyristor is turned off naturally since cathode voltage is higher than anode as time goes by, is employed to turn on thyristor with a delicate sequence. We developed thyristor servo amplifier which does not cause any damage on thyristor because it is designed to prevent triggering the two SCRs in the same arm simultaneously. And it was made clearly how to trigger SCR without any power line shorting and also harmonic analysis is carried out with the aid of FFT analyzer and proved that it can be used even severe reactive load. The designed circuit operated as a good DC amplifier in conventinal servomotor and the results can be use as a position control system application.

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Study on Controller Design of AC Servo Permanent Magnet Synchronous Motor by Matrix Converter : Speed Controller (매트릭스 컨버터에 의한 AC 서보 영구자석형 동기전동기의 제어기 설계에 대한 고찰 : 속도제어기)

  • Jeong, Chung-Il;Lee, Sang-Cheol;Mo, Dong-Yeong;Choi, Chang-Young;Kim, Tae-Woong;Park, Gwi-Geun
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.106-108
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    • 2008
  • This paper deals with the design for speed controller to drive PMSM by matrix converter without DC-link circuit as the power conversion system of AC servo motor drive. To design the speed controller of PMSM drive, the closed-loop transfer function of speed controller is calculated and then the frequency-domain response characteristics are analyzed by bode plot using Matlab. Based on the results by bode plot, the speed control gains are determined. As the real effects of controller designed in the frequency-domain display in the time-domain, the performance of speed controller is confirmed by the step response of speed controller. The design examples are shown and its validity of the design method mentioned in the paper is verified through PSIM simulation.

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Construction of the I-PD Control System by Multilayer Neural Network (다층 신경망에 의한 I-PD 제어계의 구성)

  • 고태언
    • Journal of the Institute of Convergence Signal Processing
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    • v.3 no.1
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    • pp.74-79
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    • 2002
  • Many control techniques have been proposed in order to improve the control performance in discrete-time domain control system. In control system using these techniques, the response-characteristic of system is dependent on the gains of the controller. Specially, There is a need to readjust the gain of controller when the response of system is changed by disturbance or load fluctuation. In this paper, I-PD controller and pre-compensator are designed by multilayer neural network. The gains of I-PD controller and pre-compensator are adjusted automatically by back propagation algorithm when the response characteristic of system is changed under a condition. Applying this control technique to the position control system using a DC servo motor as a driver, the control performance of controller is verified by the results of experiment.

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PID Control Structure for Model Following Control (모델 추종 제어를 위한 PID 제어기법)

  • 이창호;김종진;하홍곤
    • Journal of the Institute of Convergence Signal Processing
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    • v.5 no.2
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    • pp.138-142
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    • 2004
  • This paper proposes the design of the model following control system using the PID control structure. PID control system became model following control by inserting new pre-compensator in order to improve control performance in discrete-time region. Gain of the PID controller needs to be readjusted when response of system changes due to disturbance or load fluctuation. Performance of control system improves by joining neural network to PID control system because performance of control system depends largely on each PID gain in PID control system. And the games of the PID controller in the proposed control system are automatically adjusted by back-propagation algorithm of the neural network. Angular position of DC servo motor is selected as a plant in order to verify control performance in model following control. After it is applied to the position control system, it's performance is verified through computer experiment.

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