• Title/Summary/Keyword: Hydraulic Motor

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Position Control of Hydraulic Motor-Load System using Matlab (Matlab을 이용한 유압모터-부하계의 위치제어)

  • 이명호;박형배
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.3
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    • pp.76-83
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    • 2004
  • The purpose of this paper is to find an effective control system for a hydraulic motor-load system using matlab. The Hydraulic control system consists of a hydraulic pump, a hydraulic proportional control valve, hydraulic pipelines, a hydraulic motor and a load system. The simulation models were verified by comparing the simulation results with measured data from the real hydraulic proportional position control system. In order to compensate the nonlinear friction characteristics in a hydraulic motor-load system, a discrete time PD controller and Friction torque observer has been applied.

PWM Control of Hydraulic Motor Systems Using High Speed Solenoid Valves (고속응답 전자밸브에 의한 유압 모터계의 PWM 제어)

  • 김도태
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1999.10a
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    • pp.387-392
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    • 1999
  • The micro electronic control technology with developing microcomputers make great contribution to electrohydraulic control systems. The electrohydraulic pulse control simplifies in conjunction with power electronic amplifier and high speed operated solenoid valves. It is necessary to valves to convert electronic pulse signal to hydraulic pulse flow as fast as possible. This study deals with the speed control of an oil hydraulic motor operated by two way high speed solenoid valves. The valves acts as converters of electronic-pulse signals to hydraulic power. By constructing systems in which a hydraulic motor is operated by two solenoid valves, the pulse with modulation method (PWM) has adopted as the speed control of hydraulic motor systems. The static and dynamic characteristics of the systems are investigated by the experiment. It is clarify that a hydraulic motor operated PWM show good performance as a control component, achieving accurate velocity control.

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Characteristics Analysis of the Hydraulic Motor Design Variables (유압모터의 설계변수에 대한 특성 검토)

  • Liu, Liang-Liang;Jang, Joosup
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.4
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    • pp.188-194
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    • 2013
  • Hydrostatic pumps and motors occupy an important position in hydraulic system. There are a lot of researches on characteristics of hydraulic pumps, but not hydraulic motors. So in order to know the characteristics of hydraulic motors we had this research. The purpose of this study is to derive and analyze the theoretical calculation of hydraulic axial piston motor torque and torque ripples. Then, analyzed the differences between torque ripples with dead place and without dead place on the valve plate, and modeling a hydraulic motor with AMESim software. Finally, theoretical calculation of hydraulic motor torque ripples was verified from the viewpoint of simulation.

브러시리스 직류모터 방식 EMDP의 구동을 위한 제어시스템 설계

  • Lee, Hee-Joong;Park, Moon-Su;Min, Byeong-Joo;Choi, Hyung-Don
    • Aerospace Engineering and Technology
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    • v.4 no.1
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    • pp.162-170
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    • 2005
  • In KSLV-I, actuation system for thrust vector control of kick motor was configured as electro-hydraulic servo actuation system and consisted of actuators, hydraulic power supply system, hydraulic power distribution system and control system. In case of hydraulic power supply system, we use EMDP(Electric Motor Driven Pump) to supply hydraulic power. Generally, we use brushed DC motor for EMDP but it is not easy to operate EMDP using brushed DC motor at a high altitude. Hence, we are developing EMDP using brushless DC motor to use at a high altitude. In this study, we will explain control system for BLDC motor to drive hydraulic pump.

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A Study on the Shock Characteristics in the Hydraulic Power Shifting System of the Hydraulic Travel Motor (유압주행모터의 변속시 발생하는 충격특성에 관한 연구)

  • Lee, Joo-Seong;Lee, Kye-Bock
    • Journal of the Korean Society of Industry Convergence
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    • v.4 no.3
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    • pp.305-310
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    • 2001
  • Hydraulic power shifting systems of hydraulic travel motor may be far safer than mechanical power transmission systems. Thus, hydraulic power shifting systems are widely used for speed control on the hydraulic equipments. In the case of liquid shifting lines, the rapid change of area, such as valve closing, can result in a large pressure transient. It is necessary to assure proper control method in order to obtain the smallest shift shock. This study conducts the shock characteristics of hydraulic power shifting system of the hydraulic travel motor. Experimental results show that shock pressure depends on the operating pressure, flow rate and pipe line area. The shock characteristics can be applied for reducing shocks.

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An Analysis on Volumetric Displacement of Hydraulic Gerotor Motor (제로터 유압 모터의 용량에 관한 연구)

  • Kim, D.M.;Ham, Y.B.;Kim, S.D.
    • 유공압시스템학회:학술대회논문집
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    • 2010.06a
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    • pp.39-43
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    • 2010
  • It is hard and complex to analytically derive a volumetric displacement formula of a gerotor hydraulic motor because geometric shape of its rotors is complicate. An analytical method about the volumetric displacement is proposed in this work, which is relatively easy and based upon two physical concepts. The first one is energy conservation between hydraulic input energy of the motor and mechanical output energy. The second concept is torque equilibrium with respect to inner and outer rotors. The proposed formula about the volumetric displacement is verified by comparing an analytical displacement and a numerical displacement for an example specification of the motor. The numerical displacement is calculated through a kind of CAD technology. The analytical formula can be utilized in analysis and design of hydraulic gerotor motors.

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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.

Development of the Auto-Aging Test Controller for a Hydraulic Motor (유압모터 길들이기 자동시험 제어기 개발)

  • Jung, Gyu Hong;Shin, Dae Young;Seo, Dong Jin
    • Journal of Drive and Control
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    • v.12 no.4
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    • pp.28-34
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    • 2015
  • Because heavy-duty construction vehicles such as excavators are required for good engine-room cooling capacity, a hydraulic gear motor is adopted in the cooling fan drive mechanism to actively control the output speed, instead of adopting the conventional ON/OFF type belt drive. While gear motors are normally limited to 140bars of operating pressure, those for the cooling fan are capable of operating at continuous pressures of up to 220bars. After assembly, all gear motors for high pressure must pass an aging test which is a kind of the wearing process between the gear teeth and motor housing. During the aging process with gradual pressure increments, gear sticking sometimes occurs due to abnormal wear, resulting in defects. This paper focuses on a gear-sticking free aging test controller that is designed together with the knowledge of an experienced operator and the analysis results of experimental data of the gear jamming phenomenon. From the aging experiment, it is demonstrated that the developed controller that can alter the setting pressure of the load pump is effective for stabilizing the abrupt increase in the motor input pressure, thus preventing the hydraulic motor from stopping. This is expected to be helpful for the reduction of defects and increase in productivity.

Analysis of Tooth Contact Stress of Gerotor Hydraulic Motors (제로터 유압 모터의 치 접촉 응력 해석)

  • 김충현;김두인;안효석;정태형
    • Tribology and Lubricants
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    • v.15 no.2
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    • pp.164-170
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    • 1999
  • Gerotor is widely used as a hydraulic pump or motor, by virtue of its volume changing ability. Performance deterioration of a gerotor hydraulic motor mainly due to the wear come from the contact between inner rotor with trochoidal curve and outer rotor with circular arc profile. This research covers the basic investigation about the contact forces of a gerotor hydraulic motor using analytic method. The influence of the eccentricity and the radius of circular arc teeth on the contact stress was evaluated.

Integrated Control Algorithm of Hydraulic Pump with Electric Motor to Improve Energy Efficiency of Electric Excavator (전기굴삭기 에너지 효율 향상을 위한 유압펌프-전동기 통합 제어 알고리즘)

  • Lee, Jeeho;Lee, Jihye;Lee, Hyeongcheol;Oh, Chang Eun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.2
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    • pp.195-201
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    • 2015
  • An electric excavator consumes battery energy to drive an electric motor attached to a hydraulic pump to generate hydraulic power. In a conventional hydraulic excavator, the hydraulic pump is controlled by regulators, which are used to optimize the diesel engine efficiency. Because of a lack of battery energy capacity, an electric excavator controller should consider not only the electric motor efficiency but also the hydraulic pump efficiency. Thus, electric motor and hydraulic pump efficiency maps were constructed. An optimal operating map (OOM) was created based on the most efficient operating points under each input condition. An integrated control algorithm controlled the speed of the electric motor and displacement of the hydraulic pump according to the OOM. To confirm the utility of this algorithm, a model-in-the-loop simulator for the algorithm with an electric excavator was established. The simulation results showed that the integrated control algorithm improved the energy efficiency of an electric excavator.