• Title/Summary/Keyword: Digital state feedback

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Robust Digital Position Control of Brushless DC Motor (외란에 둔감한 브러쉬없는 직류전동기(BLDC Motor)의 디지털 위치제어)

  • 고종선;조관열;윤명중
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.39 no.1
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    • pp.36-48
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    • 1990
  • A new control method for robust position control of brushless dc motor is presented. The model of brushless dc motor is approximately linearized by field-orentation method, and it is shown that augmented state variable feedback can be applied to this system. In addition, robustness is obtained without any change of overall system response. Load disturbance is detected by 0-observer of unknown and inaccessible input, and is compensated by feedforward which has fast response. Overall system is controlled by using the MC68000 microprocessor, and the performance of the proposed control algorithm is verified by the results of simulation and experiment.

Observer-Based Digital fuzzy Controller Design Using Digital Redesign (디지털 재설계를 이용한 관측기 기반 디지털 퍼지 제어기 설계)

  • Lee, Ho-Jae;Joo, Young-Hoon;Park, Jin-Bae
    • Journal of the Korean Institute of Intelligent Systems
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    • v.13 no.5
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    • pp.520-525
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    • 2003
  • This paper concerns a design methodology of observer-based output-feedback digital controller for Takagi-Sugeno(TS) fuzzy systems using intelligent digital redesign (IDR). The term of IDR involves converting an analog fuzzy-mode-based controller into an equivalent digital one in the sense of state-matching. The considered IDR problem is viewed as convex minimization problems of the norm distances between linear operators to be matched. The stability condition is easily embedded and the separations principle is explicitly shown.

Millimeter Wave Energy Transfer based on Beam Steering (밀리미터파를 이용한 빔 조향 기반의 에너지 전송 기술)

  • Han, Yonggue;Jung, Sangwon;Lee, Chungyong
    • Journal of the Institute of Electronics and Information Engineers
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    • v.54 no.4
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    • pp.10-15
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    • 2017
  • Feedback burden of a full-digital energy beamforming, which is known as the optimal precoding scheme for radio frequency (RF) energy transfer, is huge because it uses a vector quantization for a channel feedback. To reduce the feedback burden, we consider a beam steering based wireless energy transfer, which uses a scalar quantization. Researches related to the beam steering based wireless energy transfer have been studied in special channel model with an assumption of full channel state information at the transmitter. In this paper, we analyze the beam steering scheme compared with the full-digital energy beamforming for practical channel models with channel estimation errors. According to characteristics of the millimeter wave channel, the number of antennas of the base station and the user, the distance between them, and channel estimation errors, we simulate the performance of the beam steering scheme and analyze reasons why.

The Design of Digital Controller for Performance Improvement of Automation System (자동화 시스템의 성능 향상을 위한 디지틀 제어기 설계)

  • 조정환;이철직
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.9 no.5
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    • pp.80-86
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    • 1995
  • This paper proposes the design of new digital controller to improve control performance of automation system. The proposed controller improves response time and steady state error in the driving a system to generate a output voltage proportional to the frequency difference of reference input signal and feedback signal, holds good stability and higher accuracy designing an adaptive line density selector and a quantized level controller of slope-varied type. A theoretical and experimental studies have been carried out. Th presented results how the improved performance in the position control of automation system.

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Study on Digital Control of MZMO Dynamic Systems Using I/O Delay (입출력지연을 이용한 다중입출력계의 디지탈제어에 관한 연구)

  • 박양배;김영권
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.34 no.2
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    • pp.63-71
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    • 1985
  • The existing methods of pole assignment were reserved in this paper, a digital control method for MIMO dynamic systems was developed based on pole assignment using I/O delay. The underlined concept of the derived control law was that the poles corresponding to the order of a system can be assigned on the desired positions via output delay, and the poles of the order incrememted by output delay were forced to be placed on zero positions by way of input delay when applied to an actual MIMO system, the present scheme was shown to be more effective than the conventional state feedback scheme with observer in that the former was simpler than the latter, while they performed well.

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Precise Digital Tracking Control for Multi-Axis Servo System (다축 서보시스템의 정밀 추적제어)

  • Shin, Doo-Jin;Huh, Uk-Youl
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.49 no.11
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    • pp.591-598
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    • 2000
  • In this thesis, a digital tracking controller is proposed for multi-axis position control system. Tracking and contouring error exist when the machine tool moves along a trajectory in multi-axis system. The proposed scheme enhances the tracking and contouring performance by reducing the errors. Also, an optimal tracking controller reduces the tracking error by the state feedback and the feedforward compensator reduces the effects of a nonlinear disturbance such as friction or dead zone. The proposed control scheme reduces the contour error which occurred when the tool tracks the reference trajectory. Finally, the performance of the proposed controller is exemplified by some simulations and by applying the real XY servo system.

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On the structure of a discrete-time $H_{\infty}$ two-degrees-of-freedom controller (이산시간 $H_{\infty}$ 2-자유도 제어기의 구조에 관한 연구)

  • 최병욱
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.569-572
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    • 1996
  • Explicit state-space formulate for an H$_{.inf}$ based two-degrees-of-freedom robust controller are derived in discrete-time. The controller provides robust stability against coprime factor uncertainty, and a degree of robust performance in the sense of making the closed-loop system match a prespecified reference model. It is shown that the controller consists of a plant observer, the chosen reference model, and a generalized state feedback law associated with the plant and model states. The controller structure is shown to be relatively simple and thus may reduce the computational load on the digital control processor.

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Induction Motor Position Control Using Integral-Compensating Variable Structure Control Algorithm (적분보상형 가변구조제어기법을 이용한 유도 전동기 위치제어)

  • 강문호
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.52 no.6
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    • pp.323-332
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    • 2003
  • This paper proposes a variable structure position controller for an induction motor(IM) which uses a reaching law and an integral compensating nonlinear switching function. With the integral compensating nonlinear switching function, both very low overshoot and high steady state control accuracy can be obtained by compensating the states chattering problem due to the unmodelled dynamics of inverter and feedback sensors. With the reaching law, reaching mode can be established quantitatively during transient state so that dynamic control performance is improved. For experiment a digital servo driver which consists of a DSP and an IPM inverter was developed. With the various experimental results, IM position control performance was verified.

Friction Compensator Design of a Hydraulic Proportional Position Control System (유압 비례 위치제어 시스템의 마찰력 보상기 설계)

  • 이명호
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.7 no.4
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    • pp.130-135
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    • 1998
  • This paper deals with a position control problem of a hydraulic proportional position control system using a friction compensation control. There are many nonlinearities in hydraulic systems. With only proportional controller, response is slow and steady-state error cannot be compensated properly. Controller designed in this paper achieves fast transient response through the velocity and acceleration feedback and good steady-state response through the friction compensator. A/D and D/A board is employed for data acquisition and manipulation. The experimental results are compared with computer simulation results using Matlab.

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Realization of DeadBeat Controlled PWM Inverter using Reduced-Order State Observer (최소 차원 상태관측기를 사용한 DeadBeat 제어 PWM인버터의 실현)

  • Lee, C.D.;Shin, D.R.;Jeong, Bong-Chul;Kim, J.S.;Cho, Y.H.;Woo, J.I.
    • Proceedings of the KIEE Conference
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    • 1995.11a
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    • pp.281-283
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    • 1995
  • Deadbeat controlled PWM Inverter is realized. This PWM inverter performs the instantaneous control method which is based on the real-time digital feedback control and the microprocessor-based deadbeat control. For the deadbeat current controller, the system's order becomes a high order and increases computation delay time. Therefore, The delay tine produces current ripple. To minimize the current ripple, a new method based on deadbeat control theory for current regulation is proposed. It is constructed by a reduced-order state observer which predicts the output current in next sampling instant.

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