• Title/Summary/Keyword: hydraulic servo motor control system

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A Study on the Control of Electro-Hydraulic Motors Using Ahead Predictive Adaptive Control Method (예측 적응제어 기법을 이용한 전기 유압 모터의 제어에 관한 연구)

  • Kim, Byeong-Woo;Hur, Jin
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.7
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    • pp.1360-1365
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    • 2011
  • Electro-hydraulic servo motor is used to a lot of in the field of industrial equipment which requires one of the control functions among pressure, flow, and power output. In this paper, linear discrete reference model of the electro-hydraulic servo motor system are made for 1-step ahead predictive control. The parameters of electro-hydraulic servo motor system are estimated using the recursive least square method. 1-step ahead predictive model output of electro-hydraulic servo motor system corresponded to reference model output in spite of estimated parameters are not meet real parameters. Control performance affections are studied due to the forgetting factors variation.

Design of a DSP Controller and Driver for the Power-by-wire(PBW) Driving System Using BLDC Servo Motor Pump (BLDC 서보 모터 펌프를 이용하는 직동력(PBW) 구동시스템의 DSP 제어기 및 구동기 설계)

  • Joo, Jae-Hun;Sim, Dong-Seouk;Choi, Jung-Keyng
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.5
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    • pp.1207-1212
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    • 2011
  • This paper presents a study on the DSP(Digital Signal Processor) controller for the PBW(power-by-wire) system using BLDC(Brushless Direct Current) servo motor pump. The PBW hydraulic actuator was realized with hydraulic pump driven by BLDC servo motor, hydraulic cylinder and controller. This PBW system needs speed control of servo motor for linear thrust action of hydraulic cylinder. This paper implements a servo controller with vector control algorithm and MIN-MAX PWM technique. As CPU of a controller, TMS320F2812 DSP was adopted because it has PWM waveform generator, A/D converter, SPI(Serial Peripheral Interface) port and many input/output port etc.

Properties of the Load-Sensing Hydraulic System from a Viewpoint of Control (제어관점에서의 부하감지형 유압시스템의 특성)

  • 김성동
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.3
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    • pp.738-750
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    • 1994
  • The load-sensing hydraulic system which was developed to improve energy efficiency of conventional hydraulic systems has its own properties. The instability of system responses, linearity of a servo valve, robustness for variation of external load, and dynamic interference between hydraulic motors are such properties which have much to do with control properties of the system. The load-sensing hydraulic system has instability tendancy because the load-sensing mechanism makes a positive feedback loop between the motor part and the pump part. A flow property of the servo valve can be said to be linear because the flow through the valve has nothing to do with a load pressure and the flow is strictly proportional to a valve opening which is adjusted by a valve command signal. The resultant control property can be said to be robust because the steady-state control performance is independent to the load actuated on the motor shaft. In the case when one pump simultaneously drives more than two hydraulic motors, the pump outlet pressure is determined by a hydraulic motor of the largest load pressure among all of the hydraulic motors, and, thus, the other motors are dominated by the largest load pressure. That is, the other motors can be said to be interfered by the motor of the largest load pressure.

A Study on Cycle Time and Power Saving Effect of a Hydraulic Hybrid Injection Molding Machine using a Servo Motor (서보모터를 이용한 유압 하이브리드식 사출성형기의 공정시간 및 절전효과에 관한 연구)

  • Yun, Hongsik;Kim, Sungdong
    • Journal of Drive and Control
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    • v.17 no.3
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    • pp.15-25
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    • 2020
  • The cycle time and power saving effect of a hydraulic hybrid injection molding machine using a servo motor are considered in this paper. In order to verify control characteristics, such as pressure and speed, experiments were performed with the hydraulic hybrid injection molding machine, clamping force of 110 ton. The power consumption and production cycle time of a conventional hydraulic injection molding machine were measured to compare its performances with the hydraulic hybrid injection molding machine. An injection molding machine with a clamping force of 1300 ton was used as the conventional machine, the hybrid machine was implemented by replacing its induction motors with servo motors. In the remodeled hybrid machine, experiments were performed to investigate how the displacement of the mold clamping pump affects the power consumption and production cycle time. The results showed that the production cycle time of the hybrid injection molding is similar to a conventional hydraulic injection molding machine but with a significant energy saving of about 40%.

Accurate Position Control of Hydraulic Motor Using NNGPC (NNGPC를 이용한 유압모터의 고정도 위치제어)

  • 박동재;안경관;이수한
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.143-143
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    • 2000
  • A neural net based generalized predictive control(NNGPC) is presented for a hydraulic servo position control system. The proposed scheme employs generalized predictive control, where the future output being generated from the output of artificial neural networks. The proposed NNGPC does not require an accurate mathematical model for the nonlinear hydraulic system and takes less calculation time than GPC algorithm if the teaming of neural network is done. Simulation studies have been conducted on the position control of a hydraulic motor to validate and illustrate the proposed method.

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A Study on the Speed Control of Electro - hydraulic Servo System under Load Disturbance (부하외란이 가해지는 전기.유압서보계의 속도 제어에 관한 연구)

  • 하석홍;권기수;이진걸
    • Journal of Advanced Marine Engineering and Technology
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    • v.17 no.1
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    • pp.26-32
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    • 1993
  • The loads exerted on electro-hydraulic servo system are classified into inertial, viscous, and spring load. The additional load called disturbances is also exerted on system but is generally not modeled. To deal with these kinds of loads, it is necessary to maintain the continuous signal transfer, so we can construct compensator to satisfy control specifications using feedback signal such as displacement, velocity, acceleration and pressure known as state variables. In case of controlling the speed of hydraulic motor, we must keep up robust performance for the various loads and disturbances acted on the system. However, the load flow rate in the valve is characterized by nonlinearity so that traditional theory of linear control could not be expected to give the desired performance. In this paper, it is shown that speed controller of hydraulic motor gives a good command following and disturbance rejection performance by applying sliding mode theory as a way of robust control to the nonlinearity, variation of loads and disturbances.

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Controller design of heavy load driving system (대부하 구동시스템의 제어기 설계)

  • 윤강섭;안태영;이만형
    • 제어로봇시스템학회:학술대회논문집
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    • 1992.10a
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    • pp.730-735
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    • 1992
  • In this study, heavy loads driving servo control systems, which are composed of electro-hydraulic servo-valve, hydraulic motor/cylinder, gear box and link mechanism, are investigated for implemention. To predict the performances of the systems, modelling and simulation with some nonlinearities are carried out. Simulation results are compared with experimental results.

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Remote control scheme for cranes using electro-hydraulic servo positioner with coaxial rotary spool (동축 회전형 스풀을 가진 전기 유압 서어보 위치 제어기를 이용한 크레인의 원격제어)

  • 김홍집;김경진;현웅근;서일홍;오상록
    • 제어로봇시스템학회:학술대회논문집
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    • 1990.10a
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    • pp.693-697
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    • 1990
  • A position control system is developed for an electro-hydraulic servo actuator with coaxial rotary spool, where the actuator is controlled by stepping motor. The position control system is utilized to develop the wireless remotely controlled crane system. And remote engine control system is also developed. Finally, to show the validity of this system, some experimental results and field test results am presented.

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The study on control system simplification of underdeveloping heavy-load driving system using developed performance-estimation program (대부하/구동 제어 시스템 성능예측 프로그램을 이용한 제어시스템 단순화 연구)

  • 최근국;이만형;서동연;박상우
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.436-440
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    • 1996
  • In this study, underdeveloping heavy-load driving servo control system, which are composed of controller, electro-hydraulic servo-valve, hydraulic motor, reduction gear box, turret slew bearing and turret structure, are investigated to simplify the control system. To estimate the effect of each component, modeling and simulation of linear and nonlinear system are carried out. In the first stage, to prove the reliability of performance estimation program, simulation results are compared with experimental results. In the second stage, the effect of each component of control system is evaluated and then a simplified control system is suggested.

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The Study on Control System Simplification of Underdevelop ing Heavy-Load Driving System Using Developed Performance-estimation program (대부하 구동/제어 시스템 성능추정 프로그램을 이용한 제어시스템 단순화 연구)

  • 최근국;이만형;윤강섭
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.999-1003
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    • 1996
  • In this study, underdeveloping heavy-load driving servo control system, which are composed of controller, electro-hydraulic servo-valve, hydraulic motor, reduction gear box, turret slew bearing and turret structure, are investigated to simplify the control system. To estimate the effect of each component, model ins and simulation of linear and nonlinear system are carried out. In the first stage, to prove the retiability of performance estimation pro-gram, simulation results are compared with experimental results. In the second stage, the effect of each component of control system is evaluated and then a simplified control system is suggested.

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