EP0370666A1 - Actionneur électromagnétique - Google Patents

Actionneur électromagnétique Download PDF

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Publication number
EP0370666A1
EP0370666A1 EP89311699A EP89311699A EP0370666A1 EP 0370666 A1 EP0370666 A1 EP 0370666A1 EP 89311699 A EP89311699 A EP 89311699A EP 89311699 A EP89311699 A EP 89311699A EP 0370666 A1 EP0370666 A1 EP 0370666A1
Authority
EP
European Patent Office
Prior art keywords
armature
annular
bridging member
electromagnetic actuator
magnet structure
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Withdrawn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
EP89311699A
Other languages
German (de)
English (en)
Inventor
Frank Mclean Logie
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of EP0370666A1 publication Critical patent/EP0370666A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01F7/081—Magnetic constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/04—Cores, Yokes, or armatures made from strips or ribbons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/06—Cores, Yokes, or armatures made from wires
    • 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

Definitions

  • This invention relates to an electromagnetic actuator of the kind comprising a magnet structure and an armature, the magnet structure defining at least two pole pieces which when an electrical winding forming part of the magnet structure is energised, assume opposite magnetic polarity, the armature being presented to the pole faces and being attracted to the pole faces when the winding is energised.
  • the magnet structure is a stack of laminations of generally "E" shape with the winding located about the centre limb.
  • the free end of the centre limb forms one pole face having one polarity when the winding is energised and the outer limbs define pole faces which both assume the opposite polarity.
  • the armature is of generally rectangular section.
  • the magnet structure so that the centre limb is cylindrical and the outer limbs form part of an annular member, the winding being located about the centre limb.
  • Such a magnet structure will have associated with it a circular armature.
  • British specification 2201039A discloses such an arrangement as described in the preceding paragraph and also describes a number of ways of constructing the structure in order to minimise the eddy currents.
  • the object of the invention is to provide an electromagnetic actuator of the kind specified in a simple and convenient form.
  • the magnet structure comprises inner and outer annular members formed from wound strip material and an annular bridging member interconnecting one end of the inner annular member with the adjacent end of the outer annular member.
  • the faces of said ends of the inner and outer annular members are chamfered and the inner and outer peripheral surfaces of the bridging member are shaped in a complementary manner.
  • the actuator comprises a magnet structure 10 and an armature 11.
  • the magnet structure includes an annular winding 12 and defines annular pole faces 13A, 14A which when the winding is energised assume opposite magnetic polarity.
  • the armature is spaced from the pole faces and the magnetic flux passing between the pole faces and the armature causes an attraction force to be developed between the armature and the magnet structure.
  • the pole faces are defined at one end of pole pieces 13, 14 respectively.
  • the pole pieces are defined by, inner and outer annular members 15, 16 and the magnet structure further includes an annular bridging member 17 which provides magnetic coupling between the ends of the annular members remote from the armature.
  • the members 15, 16 and the bridging member are formed from magnetic material.
  • Each of the annular members 15, 16 is formed by winding magnetic strip material about a mandrel, the material preferably being non-grain orientated or grain orientated across its width, adjacent layers of the strip being secured in any convenient manner such for example by adhesive or cement, and the adjacent layers of the strip being electrically insulated from each other by an insulating coating applied to one or both faces of the strip.
  • the radial width of the annular member 16 is less than that of the member 15.
  • the bridging member 17 comprises a stack of laminations which may be formed from non-grain orientated material and in order to enhance the magnetic coupling between the bridging member and the annular members 15, 16 the inner and outer peripheral edges of the bridging member are chamfered and the adjacent end surfaces of the inner and outer annular members 15, 16 are chamfered in a complementary manner.
  • the chamfering may be effected by grinding or by eroding techniques or in any other convenient manner.
  • the resultant actuator has a magnetic circuit a substantial part of which is of a laminated nature so that the eddy currents which arise due to changes in the magnetic flux during the use of the actuator, are minimised.
  • the actuator is intended specifically to control a valve member of a fluid control valve and a connecting member to the armature can pass through the central opening in the inner annular member if so required.
  • the outer annular member 16 is of reduced axial length and an annular pole piece 18 is provided which is magnetically coupled to the end face of the outer member and which extends towards the inner annular member 15.
  • the inner face of the pole piece is cut at an angle to reduce magnetic leakage.
  • the armature 11A is of reduced diameter and therefore lighter.
  • Figure 3 shows a further modification in that the bridging member 17A is constructed as an annular member from solid magnetic material.
  • the inner and outer annular members 15A, 16A have flat ends for engagement with the flat surface of the member 17A.
  • the modification as described with reference to Figure 2 can be applied to the modified actuator as shown in Figure 3.
  • FIG 4 shows a further modification of the example shown in Figure 2 and in this case as in the example of Figure 1, the inner and outer annular members 15, 16 are of the same axial length.
  • the annular pole piece 18 is provided as also is an inner annular pole piece 19 which has an integral spigot 20 which is located in the central opening in the inner member 15.
  • the spigot 20 is hollow and in the example a portion of the inner surface is provided with a screw thread.
  • the thread in use can be engaged by a threaded bolt which can secure the magnet structure to a support.
  • the bolt can be hollow to allow the passage therethrough of a connecting member.
  • the outer periphery of the pole piece 19 is shaped in a manner complementary to the inner periphery of the pole piece 18.
  • An alternative way of constructing a magnet structure is to form the inner and outer annular members and also the bridging member from a plurality of lengths of wire which may be of square or round section. Each length of wire during the process of constructing the magnet structure is bent to "U" shaped form.
  • a bundle of wires is assembled about a mandrel and in a central opening in an annular die.
  • the wires are then bent radially outwardly and then axially in one or a series of press operations following which the wires are secured, relative to each other by for example a potting compound, before removal from the die.
  • the thickness of the bridging member will decrease towards its outer peripheral edge and the outer annular member will be of reduced thickness as compared with the inner annular member, the cross sectional area of the magnetic circuit remaining constant.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Electromagnets (AREA)
EP89311699A 1988-11-19 1989-11-10 Actionneur électromagnétique Withdrawn EP0370666A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888827108A GB8827108D0 (en) 1988-11-19 1988-11-19 Electromagnetic actuator
GB8827108 1988-11-19

Publications (1)

Publication Number Publication Date
EP0370666A1 true EP0370666A1 (fr) 1990-05-30

Family

ID=10647155

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89311699A Withdrawn EP0370666A1 (fr) 1988-11-19 1989-11-10 Actionneur électromagnétique

Country Status (3)

Country Link
EP (1) EP0370666A1 (fr)
JP (1) JPH02180006A (fr)
GB (1) GB8827108D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1022415A1 (fr) * 1999-01-19 2000-07-26 Aug. Winkhaus GmbH & Co. KG Dispositif de blocage à actionnement électromagnétique
EP1022416A1 (fr) * 1999-01-19 2000-07-26 Aug. Winkhaus GmbH & Co. KG Dispositif de blocage à actionnement électromagnétique

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2648124A (en) * 1947-08-09 1953-08-11 Duyck Georges Method of manufacturing electromagnets
FR1200567A (fr) * 1957-07-22 1959-12-22 British Thomson Houston Co Ltd Perfectionnements apportés aux appareils à induction
FR1219327A (fr) * 1958-12-23 1960-05-17 Acec Circuits magnétiques pour bobines de self, transformateurs et analogues
US3036247A (en) * 1959-04-23 1962-05-22 Koontz Wagner Electric Company Electromagnet
US3304599A (en) * 1965-03-30 1967-02-21 Teletype Corp Method of manufacturing an electromagnet having a u-shaped core
DE2014099A1 (de) * 1970-03-24 1971-10-14 Thomas Fa Robert Elektromagnet zum Betatigen nachge ordneter Vorrichtungen
FR2344109A1 (fr) * 1976-03-08 1977-10-07 Ungari Serge Transformateur statique a noyau central
GB2046142A (en) * 1979-03-20 1980-11-12 Aerospatiale Process for making a magnetic armature and armature thus obtained
GB2144060A (en) * 1983-07-28 1985-02-27 Lucas Ind Plc Electromagnetic valve assembly

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2648124A (en) * 1947-08-09 1953-08-11 Duyck Georges Method of manufacturing electromagnets
FR1200567A (fr) * 1957-07-22 1959-12-22 British Thomson Houston Co Ltd Perfectionnements apportés aux appareils à induction
FR1219327A (fr) * 1958-12-23 1960-05-17 Acec Circuits magnétiques pour bobines de self, transformateurs et analogues
US3036247A (en) * 1959-04-23 1962-05-22 Koontz Wagner Electric Company Electromagnet
US3304599A (en) * 1965-03-30 1967-02-21 Teletype Corp Method of manufacturing an electromagnet having a u-shaped core
DE2014099A1 (de) * 1970-03-24 1971-10-14 Thomas Fa Robert Elektromagnet zum Betatigen nachge ordneter Vorrichtungen
FR2344109A1 (fr) * 1976-03-08 1977-10-07 Ungari Serge Transformateur statique a noyau central
GB2046142A (en) * 1979-03-20 1980-11-12 Aerospatiale Process for making a magnetic armature and armature thus obtained
GB2144060A (en) * 1983-07-28 1985-02-27 Lucas Ind Plc Electromagnetic valve assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Research Disclosure no. 274, February 1987, HAVANT GB page 58 "Partially Laminated Core Structure" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1022415A1 (fr) * 1999-01-19 2000-07-26 Aug. Winkhaus GmbH & Co. KG Dispositif de blocage à actionnement électromagnétique
EP1022416A1 (fr) * 1999-01-19 2000-07-26 Aug. Winkhaus GmbH & Co. KG Dispositif de blocage à actionnement électromagnétique

Also Published As

Publication number Publication date
JPH02180006A (ja) 1990-07-12
GB8827108D0 (en) 1988-12-21

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