EP0214911B1 - Drehmomentmotor mit hydraulischem Potentiometer für Servoverteiler - Google Patents

Drehmomentmotor mit hydraulischem Potentiometer für Servoverteiler Download PDF

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Publication number
EP0214911B1
EP0214911B1 EP86401946A EP86401946A EP0214911B1 EP 0214911 B1 EP0214911 B1 EP 0214911B1 EP 86401946 A EP86401946 A EP 86401946A EP 86401946 A EP86401946 A EP 86401946A EP 0214911 B1 EP0214911 B1 EP 0214911B1
Authority
EP
European Patent Office
Prior art keywords
magnets
attached
core
armatures
torque motor
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.)
Expired - Lifetime
Application number
EP86401946A
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English (en)
French (fr)
Other versions
EP0214911A1 (de
Inventor
Gérard Godon
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.)
Societe dApplications des Machines Motrices SAMM SA
Original Assignee
Societe dApplications des Machines Motrices SAMM SA
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 Societe dApplications des Machines Motrices SAMM SA filed Critical Societe dApplications des Machines Motrices SAMM SA
Publication of EP0214911A1 publication Critical patent/EP0214911A1/de
Application granted granted Critical
Publication of EP0214911B1 publication Critical patent/EP0214911B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • F15B13/0438—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being of the nozzle-flapper type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/14—Pivoting armatures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2278—Pressure modulating relays or followers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86582—Pilot-actuated
    • Y10T137/86614—Electric

Definitions

  • the present invention relates to a torque motor with hydraulic potentiometer for servo-distributor, intended in particular for the control of hydraulic cylinders and motors.
  • This type of torque motor is intended to control a hydraulic potentiometer consisting of four jets mounted in a bridge.
  • the output of the torque motor called a vane, varies the section of two nozzles, which generates a pressure differential proportional to the control current of the torque motor.
  • This comprises magnets fixed to armatures in which is placed a core whose ends are separated from the armatures by an air gap and around which are mounted two induction coils capable of being supplied with electric current.
  • the pallet is fixed by one of its ends to a bending tube itself secured to the core by its corresponding end.
  • This type of torque motor is already known, for example from document US-A-3,712,339.
  • the symmetry of the magnetic circuit means that no torque acts on the core in the absence of current in the coils.
  • each end of the core is polarized and is, in the air gaps, subjected to an electromagnetic force which creates a couple causing a bending of the tube, which in turn moves the paddle between the two associated nozzles.
  • Some torque motors are fitted with a single magnet, and others with two. These magnets have a general U-shape in which must be machined housings for the fixing screws to the frames. As a result, these magnets have a relatively complicated geometry, which causes difficulties in manufacturing. In addition, their size is important, and they have a low coercive field, so that if the torque motor is dismantled, they must be re-magnetized before reassembly.
  • the object of the invention is to remedy these drawbacks by producing a torque motor provided with magnets of simplified shape, therefore easy to manufacture, of reduced size and of strong coercive field.
  • the torque motor is provided with four parallelepiped or cylindrical magnets fixed on the armatures, made of an alloy with a strong coercive field and containing a rare earth, and placed at the rate of a pair at each lateral end of the core.
  • the magnets according to FIG. 1 are made of an alloy based on rare earth and cobalt, for example a samarium-cobalt alloy.
  • This type of magnet has, for an equal size with the usual magnets, an induction force two to three times higher while also having a strong coercive field. They can therefore have a much smaller overall size and weight than the conventional magnets used until now in torque motors.
  • the device shown in the drawings comprises a torque motor designated by the general reference M which is the subject of the invention, and a hydraulic potentiometer P known per se, arranged to be controlled by the motor M in order to generate a differential pressure, which itself can be implemented for the control of various elements, such as jacks or hydraulic motors.
  • the torque motor M comprises two metal frames 1 and 2, in which is disposed a core 3, around which are wound two induction coils 4, 5 capable of being supplied with electric current by an electric source not shown.
  • the coils 4, 5 are each wrapped in a coating 10, 20 of plastic material, housed in a support 30.
  • the above-mentioned parts are covered by a protective cover 6 fixed to a base 7 pierced centrally with an orifice 8 through which a bending tube 9, one end of which is fixed to the core 3 by embedding in the middle part thereof.
  • the bending tube 9 ends at its end opposite the core 3 by a disc 11, and contains a pallet 12 embedded at one of its ends in the bending tube 9.
  • the disc 11 is fixed to the body 13 of the hydraulic potentiometer P, tan say that the free end 12a of the pallet 12 is positioned between two nozzles 14, 15, at equal distance x from one and the other.
  • the body 13 is provided internally with two other nozzles 16, 17 housed in a pipe 18 passing through the body 13 right through to end up at outlets A and B, while the hydraulic pressure P reaches in the pipe 18 between the two nozzles 16 and 17.
  • the pipe 18 Downstream of the nozzles 16, 17, the pipe 18 communicates with two conduits 19, 21 which lead respectively to the nozzles 14 and 15, which in turn allow the passage of the hydraulic liquid in a chamber extended by a pipe 22 returning to the tank hydraulic R (not shown).
  • the torque motor M is provided, in accordance with the invention, with four magnets 23, 24, 25, 26, of parallelepiped shape in this embodiment, fixed to the frames 1, 2 on the basis of a pair of magnets mounted transversely on each side of one end of the core 3.
  • the magnets 23, 24, 25, 26 are fixed to the frames 1, 2 by gluing, and the shims 27, 28, 29, 31, made for example of soft iron, are also fixed to the respective magnets by gluing on them.
  • the magnets are made of a material having, at equal size with a conventional magnet, a much higher induction force and a strong coercive field: they can thus be constituted by an alloy based on rare earth and cobalt, for example a samarium-cobalt alloy. It is also possible to use, to constitute the elements 23, 24, 25, 26, a neodymium-iron-boron alloy, these examples being given only for information.
  • the magnets can be produced in the form of four cylindrical pellets instead of parallelepipedic ones.
  • the fact of using one of the alloys mentioned above allows, with an equal induction force with a conventional magnet, to considerably reduce the dimensions and the weight of each magnet, which can therefore be fixed to the armature corresponding by simple bonding, instead of screws as in previous embodiments.
  • the simplicity of the geometry of the magnets 23, 24, 25, 26 facilitates their machining and makes it less expensive than that of conventional magnets.
  • the device illustrated in the drawings operates as follows: the pressure P creates two flows: one travels through the nozzles 16, 14 on the one hand, and the other through the nozzles 17, 15 on the other hand, these two flows emerging from the potentiometer P through the pipe 22 to the tank R.
  • the free end 12a of the vane 12 being at equal distance x from the nozzles 14, 15, the pressures at A and B are equal when no electric current travels through the coils 4 and 5. Indeed, no torque then acts on the core 3.
  • each end of the core 3 is polarized and is located in the air gaps y, subjected to an electromagnetic force which creates a couple in the central zone O of embedding the bending tube 9 in the core 3.
  • This couple causes the tube 9 to flex, which then causes the end 12a of the pallet 12 to move.
  • the latter takes an equilibrium position when the reaction torque of the tube 9 is equal to the engine torque, while its free end approaches one of the nozzles 14 or 15. If for example this free end approaches the nozzle 14, this causes a rise in the hydraulic pressure at outlet A with respect to the pressure prevailing in outlet B.
  • This pressure differential can be used as already indicated to actuate any member such as a jack or a motor hydraulic.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Claims (5)

1. Drehmomentmotor (M) für ein hydraulisches Potentiometer (P) eines Servoverteilers, insbesondere zur Steuerung von hydraulischen Kolben-Zylinder-Einheiten und Motoren, bestehend aus Magneten, die an Gestellteilen (1, 2) be- festigt sind, in denen ein Kern (3) angeordnet ist, dessen seitliche Enden von den Gestellteilen (1, 2) durch Luft- spalte getrennt sind und der von zwei Induktionsspulen (4, 5) umgeben ist, die mit elektrischem Strom gespeist werden können, und einem Anker (12), der mit einem seiner Enden an einem Biegungsrohr (9) befestigt ist, das seiner­seits an seinem entsprechenden Ende an dem Kern (3) be­festigt ist, gekennzeichnet durch vier quaderförmige oder zylindrische, an den Gestellteilen befestigte Magnete (23, 24, 25, 26), die aus einer eine seltene Erde ent­haltenden Legierung mit hohem Koerzitivfeld bestehen und paarweise an jedem seitlichen Ende des Kerns (3) ange­ordnet sind.
2. Motor nach Anspruch 1, dadurch gekennzeichnet, daß an jedem Magnet (23, 24, 25, 26) ein Schuh (27, 28, 29, 31) zur Einstellung der Breite des entsprechenden Luftspalts befestigt ist.
3. Motor nach einem der Ansprüche 1 und 2, dadurch gekenn­zeichnet, daß die Magnete (23, 24, 25, 26) aus einer eine seltene Erde und Kobalt enthaltenden Legierung, beispielsweise einer Samarium-Kobalt-Legierung, bestehen.
4. Motor nach einem der Ansprüche 1 und 2, dadurch gekenn­zeichnet, daß die Magnete (23, 24, 25, 26) aus einer Neodym-Eisen-Bor-Legierung bestehen.
5. Motor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Magnete (23, 24, 25, 26) an den Gestellteilen durch Verklebung befestigt sind, und daß die Schuhe (27, 28, 29, 31) an den Magneten ebenfalls durch Verklebung befestigt sind.
EP86401946A 1985-09-04 1986-09-04 Drehmomentmotor mit hydraulischem Potentiometer für Servoverteiler Expired - Lifetime EP0214911B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8513138A FR2586870B1 (fr) 1985-09-04 1985-09-04 Moteur couple a potentiometre hydraulique pour servo-distributeur.
FR8513138 1985-09-04

Publications (2)

Publication Number Publication Date
EP0214911A1 EP0214911A1 (de) 1987-03-18
EP0214911B1 true EP0214911B1 (de) 1991-01-16

Family

ID=9322623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401946A Expired - Lifetime EP0214911B1 (de) 1985-09-04 1986-09-04 Drehmomentmotor mit hydraulischem Potentiometer für Servoverteiler

Country Status (5)

Country Link
US (1) US4794941A (de)
EP (1) EP0214911B1 (de)
JP (1) JPS62144552A (de)
DE (1) DE3676914D1 (de)
FR (1) FR2586870B1 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5035254A (en) * 1990-03-22 1991-07-30 Vickers, Incorporated Power transmission
US4997002A (en) * 1990-03-22 1991-03-05 Vickers, Incorporated Power transmission
US6460558B2 (en) 2000-12-04 2002-10-08 Sauer-Danfoss, Inc. Pilot stage or pressure control pilot valve having a single armature/flapper
US6467496B2 (en) 2000-12-04 2002-10-22 Sauer-Danfoss Inc. Single-adjustment, dual-null pressure setting for an electrohydraulic valve pilot stage
US20130048891A1 (en) * 2011-08-26 2013-02-28 Honeywell International Inc. Single-stage nozzle flapper torque motor and electrohydraulic valve including a flexible hermetic seal
FR2981133B1 (fr) * 2011-10-10 2013-10-25 In Lhc Procede de detection de defaillance d'une servovalve et servovalve faisant application.
EP2889491B1 (de) * 2013-12-24 2018-06-06 Goodrich Actuation Systems SAS Servoventile
US9328839B2 (en) * 2014-01-08 2016-05-03 Honeywell International Inc. High-temperature torque motor actuator
EP2922071B1 (de) 2014-03-19 2019-12-18 Goodrich Actuation Systems SAS Servoventildrehmomentmotor
US9377122B2 (en) 2014-03-27 2016-06-28 Honeywell International Inc. Flapper assemblies for torque motors of electrohydraulic valves
US9574676B2 (en) 2015-01-23 2017-02-21 Honeywell International Inc. High-temperature and high-vibration capable armature assemblies for torque motor valve actuators
US10082217B2 (en) 2016-12-08 2018-09-25 Honeywell International Inc. High-temperature and high-vibration capable armature assemblies for torque motor valve actuators with increased winding volume
PL3536978T3 (pl) 2018-03-08 2023-07-03 Hamilton Sundstrand Corporation Serwozawór
PL3536980T3 (pl) * 2018-03-08 2023-04-17 Hamilton Sundstrand Corporation Korpus zaworu do serwozaworu
CN113410963B (zh) * 2021-06-25 2022-06-07 中国船舶重工集团公司第七0七研究所 一种铝镍钴类磁钢整装式力矩电机的保磁及引导装配方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3078863A (en) * 1957-04-12 1963-02-26 Bell Aerospace Corp Electro hydraulic servo device
US3156798A (en) * 1961-04-14 1964-11-10 Biddle Co James G Resonant frequency reed relay
US3585547A (en) * 1969-07-15 1971-06-15 Bell Aerospace Corp Electromagnetic force motors having extended linearity
US3712339A (en) * 1970-11-10 1973-01-23 Rexroth G Lohrer Eisenwerk Gmb Regulating apparatus with throttle gaps
JPS6077404A (ja) * 1983-10-05 1985-05-02 Tamura Electric Works Ltd 電磁石装置

Also Published As

Publication number Publication date
FR2586870B1 (fr) 1987-12-18
EP0214911A1 (de) 1987-03-18
US4794941A (en) 1989-01-03
FR2586870A1 (fr) 1987-03-06
DE3676914D1 (de) 1991-02-21
JPS62144552A (ja) 1987-06-27

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