• Title/Summary/Keyword: Hydraulic Motor

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A study on Energy Saving Hydraulic System Using Hydraulic Transformer (유압 트랜스포머를 이용한 에너지 절감형 유압시스템에 관한 기초연구)

  • Lee, Min-Su;Ahn, Kyoung-Kwan;Cho, Yong-Rae;Jo, Woo-Keun;Hung, Ho Triet
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.917-922
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    • 2008
  • In order to reduce energy consumption, secondary controlled system has been applied to many types of equipments. In lifting equipments or press machines using hydraulic cylinder, a hydraulic transformer is used as a control component instead of a valve for motion control and a component for recovering potential energy of load. The transformer is combination of a variable displacement pump/motor as a secondary controlled element and a fixed displacement pump/motor. Based on the nominal model derived from mathematical model, the feedback type two-degree-of-freedom controller is designed and implemented. From simulation results, the disturbances including nonlinear friction torque, leakage flow and load force can be compensated and good positioning accuracy is obtained. It show that the proposed controller is effective.

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Pressure Ripple Reduction of Hydraulic Pump-Motor in HST (HST용 유압폄프.모터의 압력맥동 저감 특성)

    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.04a
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    • pp.117-123
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    • 2003
  • This paper deals with pressure ripple and noise reduction characteristics for a hydrostatic transmission(HST) consisting of a variable axial piston pump connected in an open loop to a fixed displacement axial piston motor. Pressure ripples in HST is major source of vibration, which can lead to fatigue failure of components and cause noise. In order to reduce the pressure ripple, an annular tube type hydraulic filter proposes to absorb pressure ripples with the high frequencies components to achieve better noise attenuation in HST. The basic principle tube is applied to propagation of pressure wave, reflection, absorption in cross section of discontinuity and resonance in the hydraulic pipeline. It is experimently confirmed that a hydraulic filter is absorbed to be about 30∼40dB of pressure ripple with high frequencies. These results will assist in modeling and design of noise reduction in hydraulic control systems, and here, should provide a means of designing a quieter HST.

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Design of SRM and Controller for Hydraulic Pump (유압유니트용 SRM 및 제어기 설계)

  • Kim, Bong-Chul;Kim, Tai-Hyung;Lee, Dong-Hee;Ahn, Jin-Woo
    • Proceedings of the KIEE Conference
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    • 2004.10a
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    • pp.113-115
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    • 2004
  • This paper presents a design and characteristics analysis of an SRM drive for a hydraulic pump application. A hydraulic pump is used AC Induction motor in conventional applications. The suggested drive system supplies required pressure on-line for energy saving, while conventional one holds the pressure during stand by period. The prototype motor is designed and tested through simulation and experiments.

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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.

A Study of Analyzing for Design of a Linear Force Motor for Hydraulic Valve (밸브구동용 선형 포스모터 설계를 위한 해석 연구)

  • Park, C.S.;Huh, J.Y.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.8 no.1
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    • pp.26-31
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    • 2011
  • To drive hydraulic valve is used Linear force motor, whose force and direction are controlled by electronic signals. Linear force motor has complicated figure and its force produced by changing of flux density which is produced by permanent magnet and electrical winding. Therefore it is needed an exact calculation of the flux density. In this paper a Linear force motor is designed and analysed by 3d program Flu calculating the flux density in air gap and in yoke, Force by different current. The analysed data will be tested by prototype Linear force motor. The data and analysing method can be used for designing Linear force motor.

Performance of SR Drive for Hydraulic Pump

  • Lee, Sang-Hun;Lee, Dong-Hee;An, Young-Joo;Ahn, Jin-Woo
    • Journal of Electrical Engineering and Technology
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    • v.2 no.1
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    • pp.55-60
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    • 2007
  • This paper proposes a hydraulic pump system that uses a variable speed SR drive and constant capacity pump. For the design of the SRM (Switched Reluctance Motor) and digital controller, base speed and rating torque are determined from the mechanical specifications of the hydraulic pump. In order to minimize the power consumption during the maintaining of preset oil-pressure, the pressure control system changes the maximum oil-pressure band and flow rate according to the motor speed. The DSP control system adjusts the oil-pressure and the speed of the SRM from the pressure sensor signal, due to conservation of power consumption by the hydraulic pump. A 2.2Kw, 12/8 pole SR motor and DSP based digital controller are designed and tested with experimental set-up. The test results indicate that the system has some good features such as high efficiency and rapid response characteristics.

A Study on Design and Control of Electro-Hydraulic Pump System (전기.유압펌프 시스템의 설계 및 제어에 관한 연구)

  • 박성환;하석홍;이진걸
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.4
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    • pp.1062-1070
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    • 1995
  • The study deals with controlling the velocity of hydraulic motor with PI controller through the control of displacement pump which has higher efficiency than valve-controlled system. This was done as follows. First, we modified original displacement pump and designed this electrohydraulic puma system. Second, after experimenting static and dynamic characteristics, we identified system parameter of approximated model. Lastly, to control the velocity of hydraulic motor we controlled the angle of the swash plate of displacement pump. Test carried out in the laboratory shows that transient and steady state response could be improved by PI controller reducing power loss.

The $H_{\infty}$ control of the uncertainty for the hydraulic fluid valve-motor system (유압 밸브-모터 시스템의 불확실성에 대한 $H_{\infty}$ 제어)

  • Kim, D.S.;Lee, J.H.;Yoo, S.H.;Lee, C.W.
    • Proceedings of the KSME Conference
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    • 2000.11a
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    • pp.676-681
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    • 2000
  • This study describes a hydraulic fluid property compensator under the various operating conditions. Because hydraulic fluid systems have much more excellent features than other control systems, they are used in many fields. However, the characteristics of hydraulic fluid are changed due to various operating conditions. This phenomenon is called uncertainty. Especially, bulk modulus is considered as the most dominant parameter in this study. Under the wide range of temperature and pressure, bulk modulus is changed. In order to overcome the uncertainty, $H_{\infty}$ technique will be used for this study. Spectral factorization, model-matching problem and controller parametrization are also applied to achieve the desired robust control action. Designed controller using the $H_{\infty}$ technique, is adopted for the hydraulic fluid valve-motor system.

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Computer Simulation Study of the Hydrostatic Transmission Applied to the Rack-Bar Type Sluice Gate (래크바형 수문권양기에 적용된 정유압장치의 컴퓨터 시뮬레이션에 의한 작동특성 연구)

  • Lee, S.R.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.6 no.2
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    • pp.14-21
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    • 2009
  • The typical hydraulic hoisting system of the rack-bar type sluice gate is composed of a hydraulic supply unit using an uni-directional pump, a direction control valve, a hydraulic motor, a counter balance valve, and flow control valves. Here, the hydrostatic transmission is applied to the hoisting system of rack-bar type sluice gate to simplify the operation of gate such that the upward and downward direction of gate is simply controlled by the direction of pump rotation. The new hydraulic hoisting system is composed of a bi-directional pump, a hydraulic motor, two counter balance valves, two check valves, two pilot-operated check valves, two relief valves and a shuttle valve. The characteristics of a suggested system are analyzed by computer simulations.

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