EP1548289A1 - Elektrohydrostatischer Stellantrieb - Google Patents

Elektrohydrostatischer Stellantrieb Download PDF

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Publication number
EP1548289A1
EP1548289A1 EP03029549A EP03029549A EP1548289A1 EP 1548289 A1 EP1548289 A1 EP 1548289A1 EP 03029549 A EP03029549 A EP 03029549A EP 03029549 A EP03029549 A EP 03029549A EP 1548289 A1 EP1548289 A1 EP 1548289A1
Authority
EP
European Patent Office
Prior art keywords
actuator
fluid
housing
reservoir
controller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03029549A
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English (en)
French (fr)
Inventor
Silva Gabriel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Young and Franklin Inc
Original Assignee
Young and Franklin Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Young and Franklin Inc filed Critical Young and Franklin Inc
Priority to EP03029549A priority Critical patent/EP1548289A1/de
Publication of EP1548289A1 publication Critical patent/EP1548289A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/18—Combined units comprising both motor and pump

Definitions

  • the invention relates to an electro-hydrostatic actuator that is ideally suited to control the positioning of a valve or any other similar device.
  • this invention relates to a compact electrically operated linear actuator integrates all controls and components so rapidly and efficiently heat dissipation and cooling to component parts is provided.
  • linear actuator of the type herein disclosed also require certification when employed in an environment where an explosion might take place as for example in controlling valves utilized in gas or oil pipelines or in certain processing plants where volatile chemicals are used in the process.
  • many of the actuators are housed in rather bulky complex structures, external power supply and controls that are costly to construct and difficult to service and maintain in the field.
  • the electronic control of the actuator is designed to be located in separate remote housing having a non-hazardous controlled environment. The cabling between the actuator and the controller can be relatively long which can lead to signal transmission loses and other related difficulties.
  • the invention presently here provides a solution to electrical control actuation within a compact package designed to meet uniform cooling and protection for use in hazardous environments.
  • the motor drives the impeller at a speed so as to increase the pressure of the oil on one side of the piston to a level wherein the piston and piston rod are displaced upwardly to reposition any type of device that is secured to the piston rod.
  • a weight or spring is used to return the piston to its home position when the motor is de-energized.
  • Gerbe device provides for improved motor cooling
  • the electronic controls for the motor are situated at a location remote from the tank housing and is therefore subject to all the problems associated with transmission lines of any appreciable length.
  • the electrical unit associated with the actuator must be housed in its own non-hazardous container, the system is costly to maintain.
  • a still further object of the present invention to provide fluid cooling to both the mechanical and electrical components of an electro-hydrostatic actuator.
  • Another object of the present invention is to provide a more compact, non-hazardous valve actuator.
  • Yet another object of the present invention is to reduce transmission loss typical of an electro-hydrostatic valve actuator.
  • an electro-hydrostatic actuator having a sealed housing filled with a dielectric fluid.
  • a motor driven pump and electrical circuitry for controlling the pump are all immersed in the fluid contained within the housing.
  • the pump is arranged to deliver fluid from the housing to a hydraulic cylinder to move the piston rod of the cylinder to a desired location along its available path of travel.
  • the piston rod is connected to the stem of a valve and serves to control the flow of a fluid through the valve.
  • FIG. 1 is a perspective view illustrating an electro-hydrostatic actuator embodying the present invention
  • FIG. 2 is an exploded view in perspective showing the outer housing removed from the internal components of the actuator
  • FIG. 3 is an enlarged exploded view in perspective of the internal components of the actuator
  • FIG. 4 is a schematic diagram illustrating the functional relationship between the actuator components
  • FIG. 5 is a partial view in section showing a pressure compensating unit employed in the practice of the present invention.
  • FIG. 6 is a perspective view illustrating a further embodiment of the invention.
  • FIG. 7 is an enlarged perspective view showing the internal components of the actuator illustrated in Fig. 6;
  • FIG. 8 is a front elevation in section of the actuator illustrated in Fig. 6.
  • a linear electro-hydrostatic actuator generally referenced 10, that embodies the teachings of the present invention.
  • the actuator includes a cylindrical housing 12 that is seated upon a base plate 13. The top of the housing is closed by a top cover 15. Although not shown, the housing is provided with suitable seals preventing fluid from escaping from the housing.
  • a support block 17 is mounted upon the base which houses a brushless d.c. motor 18 within a motor compartment 19.
  • the motor includes a permanent magnet 20 that is mounted upon the rotor section 21 of the motor and windings 22 located upon the motor stator 23.
  • the motor is designed to yield high energy density due to low rotating inertia and has improved thermal performance due to the windings having a direct thermal path to the exterior surface of the motor.
  • the brushless motor is commutated by an electronic controller 25 rather than by more conventional brushes and commutator bars. Accordingly, there are no brushes to wear out and little or no maintenance is required over the life of the motor.
  • An adaptor plate 29 is mounted upon the top of the support block over the motor compartment 19.
  • a gear pump 30 is, in turn, mounted upon the adaptor plate and the drive shaft 26 of the pump is connected to the rotor shaft of the motor by any suitable means.
  • the outlet port 31 of the pump is connected to a supply channel 33 in the support block by a supply line 35.
  • the flow channel outlet is connected to a hydraulic cylinder 37 by means of a second supply line 38.
  • the hydraulic cylinder is secured to the bottom surface 39 of the base plate.
  • the piston rod 40 of the hydraulic cylinder may be connected to the stem of a plunger type valve to regulate the flow through the valve.
  • the interior of the housing is completely filled with a dielectric oil to totally immerse the motor, the pump and the controller in oil.
  • the inlet to the pump is exposed to the reservoir of oil and as will be explained in greater detail below, the pump is arranged to deliver the oil to a chamber within the hydraulic cylinder on one side of a piston that is connected to the piston rod 40.
  • the controller is mounted upon the base plate immediately adjacent to the support block 17.
  • the controller is microprocessor based and in addition to the motor communication circuitry, the controller contains circuitry relating to an actuator position loop as well as other status monitoring functions which will be described in further detail below.
  • the motor control circuitry monitors the rotor position via a resolver 27 that is mounted concentric to the rotor and provides a sinusoidal current to the motor windings to control motor torque.
  • a solenoid valve 43 is also immersed in the oil reservoir and is placed in fluid flow communication with a bypass channel 44 formed in the support block 17.
  • the channel connects into the previously noted supply line channel 33 formed in the block.
  • the solenoid valve is normally closed and is opened upon a signal from the controller in the event a fault is detected in one of the monitored function. Opening the solenoid valve causes the supply line to the hydraulic cylinder to be bypassed allowing oil on the pressure side of the piston to be returned rapidly to the reservoir.
  • a compensating unit 48 is mounted in the top cover 15 of the housing.
  • the unit is shown in further detail in Fig. 5.
  • the compensating unit 48 provides variable volume for fluid expansion and fluid surge. It also provides positive pressure to the oil reservoir 51.
  • the unit is housed within a cylindrical vessel 50 that opens through the top cover into the oil reservoir 51 of the adaptor housing.
  • the cylindrical body of the unit passes through a suitable opening in the cover and a clamping flange 52 is secured to the top cover by any suitable means.
  • a seal 53 is placed between the flange and the top cover to prevent fluid from passing between the two members.
  • a piston 55 is mounted inside the vessel and a close sliding fit is provided between the piston and the inner wall of the vessel.
  • a piston shaft 56 is secured at one end to the piston and passes upwardly through the top wall 57 of the vessel.
  • the shaft is slidably contained within a brushing 58 mounted in the top wall of the vessel.
  • a plate 59 containing an orifice 60 is secured to the bottom of the vessel and, in assembly, the plate is placed in contact with the oil contained in the reservoir so that the oil can pass into the chamber 61 below the piston.
  • a compression spring 62 surrounds the piston shaft which acts to bias the piston downwardly with a given force into contact with the oil in the chamber.
  • the piston shaft also provides a visual indication of the oil level within the reservoir.
  • a hermetically sealed connector 62 is also contained in the top wall of the housing through which electrical lines are passed into and out of the housing to provide power to the controller as well as carrying data signal to and from the controller.
  • the actuator controlling a plug type valve 63.
  • the brushless motor 18 is connected to pump 30 via drive shaft 26.
  • the motor is connected to the controller 25 by a suitable electrical line 65.
  • the microprocessor based controller is arranged to monitor the rotor position of the motor through the resolver 27 which communicates with the controller via data line 66.
  • the pump 30 is arranged to deliver oil from the reservoir 51 to the hydraulic cylinder 37 through supply line 38.
  • the reservoir is shown for explanatory purposes as a tank with the understanding that the controller, the motor and the pump are all completely immersed within the reservoir.
  • a piston 68 is contained within the hydraulic cylinder that divides the cylinder into an upper chamber 70 and a lower chamber 71.
  • the piston is attached to piston rod 40 which in turn passes out of the cylinder through bottom wall 72.
  • the extended end of the piston rod is equipped with a flange 74.
  • the stem 75 of the valve is similarly equipped with a flange 77 and a spring 78 is interposed between the two flanges. The spring is arranged to normally hold the valve in a closed position when the pump is inoperative.
  • a linear variable displacement transducer (LVDT) 80 is operatively associated with the piston rod and provides position data to the controller via line 81. Using data provided by the resolver and the LVDT, the controller can set the valve to any desired position within its operating range. Any fluid that might accumulate in the upper chamber of the hydraulic cylinder is exhausted back to the reservoir via discharge line 83.
  • the solenoid activated trip valve 43 is mounted in the bypass channel 44 and is arranged to open in response to a trip signal from the controller sent over trip line 85. Opening the solenoid valve provides a path for high pressure oil in the supply line to be discharged rapidly back to the reservoir thereby permitting the control valve to close.
  • a pressure transducer 86 is mounted in the reservoir to provide pressure information to the controller by means of line 87.
  • the oil temperature in the reservoir is also provided to the controller by a thermal sensor 88 via data line 89.
  • a fluid level sensor 90 is mounted in the reservoir and provides oil level data to the controller via data line 91.
  • Figs. 6-8 there is illustrated a further embodiment of the invention in which the hydraulic cylinder is brought into a housing 100 along with the motor driven pump and the controller.
  • the housing 100 is split into two sections that include an upper section 101 and a lower section 102.
  • the lower section is equipped with a contoured base that has a first vertically disposed compartment 105 that passes upwardly into the base through the bottom wall 106 of the lower housing section.
  • a second vertically disposed compartment 107 is similarly passed upwardly into the base through the bottom wall of the lower section of the housing.
  • the second compartment is in parallel alignment-adjacent to the first compartment.
  • the brushless motor 110 as described above is mounted upon a cover plate 111 and a gear pump 112 is mounted over the motor and is coupled to the motor shaft 112.
  • the motor stator is arranged to be supported in a stationary condition within the first compartment 105 as illustrated in Fig. 8 and the cover plate is secured to the base by screws to close the recess.
  • the pump is connected to the motor shaft and the mounting flanges 114 of the pump are secured by screws to a horizontally disposed shoulder 116 that surrounds the upper opening to the recess.
  • the hydraulic cylinder 120 is arranged to be slidably received in the second compartment through the bottom opening thereof.
  • the cylinder is supported in an upright position upon a second cover plate 121 that is arranged, in assembly, to close the bottom opening of the compartment.
  • the cylinder manifold 122 is mounted upon the top of the cylinder and is secured in place using suitable screws.
  • a supply line 125 is connected at one end to the outlet of the pump and at the other end to the inlet channel 127 of the cylinder manifold.
  • a solenoid activated trip valve 126 is secured to one side of the manifold and is connected into the inlet channel of the manifold by means of a bypass channel (not shown).
  • the actuator controller 130 is mounted in the upper section 101 of the housing.
  • the upper section of the housing as well as the two cover plates 111 and 121 are sealed in assembly against the lower section of the housing using suitable seals 132 to render the housing leak proof.
  • the interior cavity 133 of the housing is filled with a dielectric oil which totally immerses all of the component parts of the system contained within the housing. As should now be evident, any heat that is generated by the actuator is rapidly transferred to the walls of the housing and dissipated into the surrounding ambient.
  • a piston 140 is contained within the hydraulic cylinder 120 and a piston rod 141 is secured to the piston and passes out of the housing through cover plate 121.
  • a blind hole 142 passes downwardly through the piston and the piston rod and a linear variable displacement transducer (LVDT) 145 is contained within the hole.
  • the LVDT is arranged to pass upwardly through the cylinder manifold and is connected to the controller to provide piston rod position data to the controller.
  • a resolver 147 as described above, is mounted upon the rotor of the motor and sends rotor position information to the controller.
  • pressure, temperature and fluid level sensors are mounted within the housing which also sends data to the controller for processing. Inlet and outlet leads are passed into and out of the housing by means of sealed connectors 150 and 151.
  • a compensator unit 160 as described above is mounted in the top wall of the upper section of the housing.
  • the piston rod of the actuator may be connected to the stem of a plunger type valve and a spring employed to return the piston to a home position when the pump is de-energized.
EP03029549A 2003-12-22 2003-12-22 Elektrohydrostatischer Stellantrieb Withdrawn EP1548289A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03029549A EP1548289A1 (de) 2003-12-22 2003-12-22 Elektrohydrostatischer Stellantrieb

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03029549A EP1548289A1 (de) 2003-12-22 2003-12-22 Elektrohydrostatischer Stellantrieb

Publications (1)

Publication Number Publication Date
EP1548289A1 true EP1548289A1 (de) 2005-06-29

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ID=34530689

Family Applications (1)

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EP03029549A Withdrawn EP1548289A1 (de) 2003-12-22 2003-12-22 Elektrohydrostatischer Stellantrieb

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EP (1) EP1548289A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101392809B (zh) * 2007-09-21 2013-05-01 利勃海尔航空航天林登贝格股份有限公司 主动液压阻尼器和液压作动器
WO2016139104A1 (de) * 2015-03-03 2016-09-09 Robert Bosch Gmbh Elektrohydraulischer kompaktantrieb für drehbewegungen
EP2770218A3 (de) * 2013-02-26 2017-04-26 Actuant Corporation Autonome bidirektionale elektrohydraulische Drehantriebseinheit
CN113042339A (zh) * 2021-03-29 2021-06-29 浙江工贸职业技术学院 超疏水织物表面制备方法及磁力搅拌喷涂装置和辊子滚涂装置
JPWO2022137882A1 (de) * 2020-12-23 2022-06-30
WO2023148217A1 (de) * 2022-02-07 2023-08-10 Robert Bosch Gmbh Linearaktor zum betätigen eines prozessventils

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2631431A (en) * 1949-07-05 1953-03-17 Elmeg Electrohydraulic actuating device
GB822164A (en) * 1956-04-20 1959-10-21 Electrol Inc Improvements relating to hydraulic actuators
US3505814A (en) * 1967-11-01 1970-04-14 Bell Aerospace Corp Valve operator system
US3572032A (en) * 1968-07-18 1971-03-23 William M Terry Immersible electrohydraulic failsafe valve operator
EP0048778A1 (de) * 1980-10-01 1982-04-07 Skil Controls Limited Ventilbetätigungen
DE3423316A1 (de) * 1984-06-23 1986-01-02 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffoerderaggregat
EP0395420A2 (de) * 1989-04-28 1990-10-31 Parker Hannifin Corporation Elektrohydraulisches Stellglied
US5109672A (en) * 1990-01-16 1992-05-05 The Boeing Company Method and apparatus for cooling and replenishing aircraft hydraulic actuators
US5117633A (en) * 1990-07-10 1992-06-02 Allied-Signal Inc. Pneumohydraulic actuator
WO2003016718A1 (en) * 2001-08-21 2003-02-27 Advanced Rotary Systems, Llc Integrated motorized pump
US20030077183A1 (en) * 2001-10-24 2003-04-24 Snecma Moteurs Electrohydraulic actuator

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2631431A (en) * 1949-07-05 1953-03-17 Elmeg Electrohydraulic actuating device
GB822164A (en) * 1956-04-20 1959-10-21 Electrol Inc Improvements relating to hydraulic actuators
US3505814A (en) * 1967-11-01 1970-04-14 Bell Aerospace Corp Valve operator system
US3572032A (en) * 1968-07-18 1971-03-23 William M Terry Immersible electrohydraulic failsafe valve operator
EP0048778A1 (de) * 1980-10-01 1982-04-07 Skil Controls Limited Ventilbetätigungen
DE3423316A1 (de) * 1984-06-23 1986-01-02 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffoerderaggregat
EP0395420A2 (de) * 1989-04-28 1990-10-31 Parker Hannifin Corporation Elektrohydraulisches Stellglied
US5109672A (en) * 1990-01-16 1992-05-05 The Boeing Company Method and apparatus for cooling and replenishing aircraft hydraulic actuators
US5117633A (en) * 1990-07-10 1992-06-02 Allied-Signal Inc. Pneumohydraulic actuator
WO2003016718A1 (en) * 2001-08-21 2003-02-27 Advanced Rotary Systems, Llc Integrated motorized pump
US20030077183A1 (en) * 2001-10-24 2003-04-24 Snecma Moteurs Electrohydraulic actuator

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101392809B (zh) * 2007-09-21 2013-05-01 利勃海尔航空航天林登贝格股份有限公司 主动液压阻尼器和液压作动器
EP2770218A3 (de) * 2013-02-26 2017-04-26 Actuant Corporation Autonome bidirektionale elektrohydraulische Drehantriebseinheit
WO2016139104A1 (de) * 2015-03-03 2016-09-09 Robert Bosch Gmbh Elektrohydraulischer kompaktantrieb für drehbewegungen
US10435126B2 (en) 2015-03-03 2019-10-08 Robert Bosch Gmbh Electro-hydraulic compact drive for rotational movements
JPWO2022137882A1 (de) * 2020-12-23 2022-06-30
WO2022137882A1 (ja) * 2020-12-23 2022-06-30 日本アイキャン株式会社 電動液圧アクチュエーター
JP7262870B2 (ja) 2020-12-23 2023-04-24 日本アイキャン株式会社 電動液圧アクチュエーター
CN116097016A (zh) * 2020-12-23 2023-05-09 日本我能株式会社 电动液压致动器
CN116097016B (zh) * 2020-12-23 2023-10-20 日本我能株式会社 电动液压致动器
US11815108B2 (en) 2020-12-23 2023-11-14 Ican Company Ltd. Electro-hydraulic actuator
CN113042339A (zh) * 2021-03-29 2021-06-29 浙江工贸职业技术学院 超疏水织物表面制备方法及磁力搅拌喷涂装置和辊子滚涂装置
WO2023148217A1 (de) * 2022-02-07 2023-08-10 Robert Bosch Gmbh Linearaktor zum betätigen eines prozessventils

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