• Title/Summary/Keyword: Hydraulic Motor

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Development of the Rack-Bar Type Sluice Gate Applying the Hydrostatic Transmission (정유압식 래크바형 수문권양기의 개발)

  • Lee, Seong-Rae
    • Transactions of The Korea Fluid Power Systems Society
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    • v.7 no.4
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    • pp.15-22
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    • 2010
  • 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, a counter balance valve, 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 and experiments.

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Development of the Rack-Bar Type Sluice Gate Applying the Hydrostatic Transmission (정유압식 래크바형 수문권양기의 개발)

  • Lee, Seong-Rae
    • 유공압시스템학회:학술대회논문집
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    • 2010.06a
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    • pp.86-92
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    • 2010
  • 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, a counter balance valve, 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 and experiments.

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Active Force Control of Electro-Hydraulic Hybrid Load Simulator using Quantitative Feedback Theory (QFT를 이용한 전기유압 하이브리드 부하 시뮬레이터의 능동 힘제어)

  • Yoon, Joo-Hyeon;Ahn, Kyoung-Kwan;Truong, Dinh Quang;Jo, Woo-Geun
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.2
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    • pp.45-53
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    • 2009
  • Today, reduction of $CO_2$ exhaustion gas for global-warming prevention becomes important issues in all industrial fields. Hydraulic systems have been widely used in industrial applications due to high power density and so on. However hydraulic pump is always being operated by engine or electric motor in the conventional hydraulic system. Therefore most of the conventional hydraulic system is not efficient system. Recently, an electro-hydraulic hybrid system, which combines electric and hydraulic technology in a compact unit, can be adapted to a wide variety of force, speed and torque requirements. In the electro-hydraulic hybrid system, hydraulic pump is operated by electric motor only when hydraulic power is needed. Therefore the electro-hydraulic system can reduce the energy consumption drastically when compared to the conventional hydraulic systems. This paper presents a new kind of hydraulic load simulator which is composed of electro-hydraulic hybrid system. Disturbances in the real working condition make the control performance decrease or go bad. QFT controller is designed to eliminate or reduce the disturbance and improve the control performance of the electro-hydraulic load simulator. Experimental results show that the proposed controller is verified to apply for electro-hydraulic hybrid system with varied external disturbances.

Research of Novel Water Cooling Jacket for Explosion-proof Motor

  • Wang, Yu;He, Huiming;Bai, Baodong
    • Journal of international Conference on Electrical Machines and Systems
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    • v.3 no.1
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    • pp.67-71
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    • 2014
  • The well tightness of the coal mining water-cooling explosion-proof motor results in difficult heat dissipation, high hydraulic pressure is needed to increase the cooling effect. However, high hydraulic pressure may lead motor shell to deform, which makes it difficult to change the motor and maintain the motor unit. The method of adding keyhole caulk weld spots on the outer cooling water jacket was proposed to solve the problem. Based on the elasticity mechanics equations and the principle of finite element method the stresses and the deformations of the traditional and novel outer cooling water jacket were calculated separately. A hydraulic pressure experiment of the both cooling water jackets was constructed. Obviously, the stress and the deformation of the novel cooling water jacket are lower. The experimental result is consistent with the simulation results. It is effective to reduce the stress and the deformation of the cooling water jacket by adding the keyhole caulk weld spots.

A Study on the Regeneration Efficiency of the Electric Forklift Using the Variable Hydraulic Motor (가변 유압모터를 이용한 전동지게차 리프트회생 효율에 관한 연구)

  • Park, Yong Soo;Yu, Ying-Xiao;Yun, Jin Su;Do, Tri Cuong;Han, Sung Min;Shin, Jung Woo;Yu, Choong Mok;Ahn, Kyoung Kwan
    • Journal of Drive and Control
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    • v.17 no.3
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    • pp.26-32
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    • 2020
  • In modern society, the energy-saving problem of industrial vehicles is economically and environmentally critical. Energy savings using the potential energy of forklifts are one of the viable solutions to resolving this problem. The basic concept of this study is to operate the hydraulic motor and recharge the battery using the flow rate from the cylinder when loading heavy objects and lowering the fork. To save energy, the torque and rotational speed of the generator should be optimized according to the load and descent speed to increase efficiency. To this end, we propose a system that optimizes energy saving efficiency by controlling the swashplate angle of the variable hydraulic motor through the GA(Genetic-Algorithm). The results were verified by building and comparing fixed motor models and variable motor models using the AMEsim. The results of the study show that the proposed optimized swashplate angle increases the energy saving efficiency by approximately 6%-8%, depending on the working conditions.

A Study on the Circuit Composition and Characteristics Analysis for Heavy-Duty Vehicular Hybrid Hydraulic Driving System (대형 자동차 하이브리드 유압 구동시스템의 회로구성과 특성해석에 관한 연구)

  • 이재구;이재천;한문식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.2
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    • pp.197-204
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    • 2004
  • An accumulator in hydraulic systems stores kinetic energy during braking action, and then that controls hasty surge pressure. An energy recovery system using accumulator seems to be advantageous for ERBS due to its high energy density. This study suggests a method to decide suitable accumulator volume for ERBS. The method is based upon energy conservation between kinetic energy of moving inertia and elastic energy of accumulator. The energy conversion was analyzed and a simple formula was derived. Also accumulator tests were conducted for different load mass and motor speed. A series of test work were carried out in the laboratory and the dynamic characteristics of the hydraulic motor system, such as the surge pressure and response time, were investigated in both brake action and acceleration action and these results show that the proposed design is effective for decision accumulator volume in ERBS.

Development of driving device by using proportional control valve (제어용 밸브를 이용한 동력전달계 개발)

  • HEO HYEUNG-SEOK;SUH YONG-KWEON;LEE SANG-BONG;SUH HO-JIN
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2004.05a
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    • pp.157-160
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    • 2004
  • In this paper, a performance characteristic pump and motor is investigated. The hydraulic pump and motor are axial piston type with swash plate. Proportional control valve which can control that plate is an important component for its performance characteristics. We will show the control characteristics for them Experiment results show that behavior can be shown with changing the various parameters.

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The study on the friction characteristics of spherical hydrostatic bearing for hydraulic piston motor (유압모터 구면 정압베어링의 마찰특성에 관한 연구)

  • 함영복;최영호;김성동
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.647-650
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    • 2001
  • In case of bent axis type axial piston hydraulic pump or motor, hydrostatic bearing used to achieve the lubrication effect on the mechanical sliding contact areas between the following pairs ; piston shoe and swash plate, valve plate and cylinder block, piston and cylinder block, etc. In this research, we designed two pairs of spherical ball joint in witch connecting rod piston end. The one is not hydrostatic bearing, the other is designed with spherical hydrostatic bearing in point of view minimum pumping power loss. By varying supply pressure on the piston, we can know that it is possible to reduce the friction torque by using hydrostatic bearing designed one. Finally, by comparing the results of driving torque between the two models, it was verified that the spherical hydrostatic bearing is well designed.

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Energy Saving Hydraulic Control System using Hydraulic Pump/Motor

  • Yongrae Cho;Bumseung Oh;Kyoungkwan Ahn;Soonyong Yang;Lee, Byungryong
    • 제어로봇시스템학회:학술대회논문집
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    • 2002.10a
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    • pp.66.1-66
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    • 2002
  • Today it becomes a serious problem to exhaustion of a fossil fuel and air pollution by exhaust gases from road vehicles for environment preservation. To solve this problem, the developments of a hybrid vehicle have been processed for the purpose of reducing pollution and energy-savings. By the way, flywheel hybrid vehicle using variable pump/motor was proposed as one feasible hybrid system in place of hybrid vehicle system by the conventional storage battery. The proposed flywheel hybrid vehicle is composed of an accumulator or a flywheel as the energy generation and storage source and three variable hydraulic pump/motor as the energy transfer device. Flywheel has the characteristic of high...

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A Study on the Hydrostatic Test of Slipper Pad for Hydraulic Piston Motor (유압 피스톤모터용 Slipper Pad의 정압시험에 관한 연구)

  • 함영복;김광영;김형의
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.645-649
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    • 1997
  • In case of swash plate type axial piston hydraulic motor, hydrostatic bearing used to achieve the lubrication effect on the mechanical sliding contact areas between the following parirs ; sliooer-pad and swash plate,piston and cylinder bore,valve plate and cylinder block, etc. This study discussed the basic charateristic for the hydrostatic slipper-pad bearings with the capillary or orifice restrictor under static load condition. And, we also development of hydrostatic bearing tester for hydrostatic balancing test of pistion & slipper-pad assembly, and some experimental data on supply pressure step responce are reported.

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