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WO2002067277A1 - Procede de fabrication d'une bobine electromagnetique, dispositif obtenu conformement audit procede et actionneur - Google Patents

Procede de fabrication d'une bobine electromagnetique, dispositif obtenu conformement audit procede et actionneur Download PDF

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Publication number
WO2002067277A1
WO2002067277A1 PCT/NL2002/000112 NL0200112W WO02067277A1 WO 2002067277 A1 WO2002067277 A1 WO 2002067277A1 NL 0200112 W NL0200112 W NL 0200112W WO 02067277 A1 WO02067277 A1 WO 02067277A1
Authority
WO
WIPO (PCT)
Prior art keywords
shell
coil
resin
actuator
core
Prior art date
Application number
PCT/NL2002/000112
Other languages
English (en)
Other versions
WO2002067277A8 (fr
Inventor
Arthur Perry Berkhoff
Original Assignee
Nederlandse Organisatie Voor Toegepast Natuurwetenschappelijk Onderzoek Tno
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 Nederlandse Organisatie Voor Toegepast Natuurwetenschappelijk Onderzoek Tno filed Critical Nederlandse Organisatie Voor Toegepast Natuurwetenschappelijk Onderzoek Tno
Publication of WO2002067277A1 publication Critical patent/WO2002067277A1/fr
Publication of WO2002067277A8 publication Critical patent/WO2002067277A8/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/127—Encapsulating or impregnating

Definitions

  • the present invention relates to a method for manufacturing an electromagnetic coil for, in particular, an actuator, such as an active damper.
  • electromagnetic coils in particular in electromagnetic coils used in actuators, heat is developed when current flows through the electromagnetic coil. As a result, the electromagnetic coil heats up. This heat has to be dissipated so as to, inter alia, prevent the electromagnetic coil from breaking down.
  • the object of the present invention is to provide a method, wherein the device obtained according to that method can properly dissipate the heat developed in the electromagnetic coil.
  • this object is achieved by the provision of a method for manufacturing an electromagnetic coil for, in particular, an actuator, such as an active damper, comprising the steps of: a) winding a metal wire on a core to form a coil, b) impregnating the coil with a resin, c) placing a shell around the coil impregnated with resin, which shell is preferably provided with one or more slots extending preferably in axial direction; d) allowing the resin to harden in the shell.
  • the coil By impregnating the coils with resin, on the one hand, the coil obtains a greater solidity, but, what is also achieved in particular is that the heat dissipation is improved by conduction of the heat via the resin.
  • the dissipation of gasses released during the hardening is improved as, then, the winding wires of the coil can guide any gas bubbles, to allow the gas bubble to escape via the slot when it has arrived there.
  • a good heat-conducting resin such as, for instance, a resin of the type Sterling 073- 1980. What is meant here by axial direction is a direction parallel to the imaginary central coil axis around which the coil has been wound.
  • step b) is executed with the aid of vacuum impregnation.
  • an actuator it is preferred to take a hollow core for the core, since the further magnet(s) and or coil(s) cooperating with the electromagnetic coil can then be disposed within the hollow core so that the heat dissipation via the shell to the outside can take place more easily.
  • the preferably hollow core 1 is made of a non-magnetic, such as a non-ferromagnetic, material.
  • the shell be made of a ferromagnetic material, in particular a ferromagnetic iron or a ferromagnetic steel.
  • the ventilation slots in particular if they extend in axial direction, have as an additional advantage that they counteract so-called "Eddy Currents".
  • the shell has at least one slot extending throughout the axial length.
  • the advantage thereof is that the possibility exists to slightly vary the diameter of the shell, for instance by pressing the shell parts together at the slot and thus ensuring a sohd and tight abutment against the impregnated coil. This improves the contact with the coil and impregnating resin, which is advantageous to the heat dissipation.
  • a further advantage is that, then, there is the possibility that the shell can increase somewhat in diameter, since at the slot, the edges of the shell bounding the slot can yield slightly so that possible expansion of the resin or the coil can be compensated without this giving rise to high internal stresses.
  • the shell has two or more of such slots extending throughout the axial length.
  • the shell is then built up from a number of shell parts, which considerably facihtates placing the shell around the coil, and also facihtates movement relative to each other of the shell parts bounding the slot.
  • the coil will be pushed into the shell somewhat but, by the successive provision of the shell parts, the shell can be placed around the coil.
  • the hardening will preferably take place in an oven.
  • the hardening will further preferably take place at a temperature higher than 100°C, more preferably higher than 150°C.
  • the hardening will preferably take place at a temperature lower than
  • the hardening is executed such that a gluing together of the coil to the shell by the resin takes place. This has the additional advantage that a sohd mechanical connection between the shell and the coil is formed.
  • the invention relates to a device obtained with the method according to the invention.
  • the invention relates to an actuator comprising an electromagnetic coil according to the invention or obtained with the method according to the invention.
  • the invention relates to an actuator comprising: a hollow core of non-magnetic, in particular non-ferromagnetic material, at least one electromagnetic coil wound on the hoEow core, impregnated with resin a shell of a ferromagnetic material located around the coil; wherein the shell is provided with at least one slot extending in axial direction and overlapping the coil, and wherein the coil is glued together to the part of the shell overlapping the coil by the resin.
  • Fig. 1 shows a schematic longitudinal section of an actuator according to the invention
  • Fig. 2 shows a hollow core for use with the method according to the invention
  • Fig. 3 shows the hollow core according to Fig. 2 with three electromagnetic coils wound thereon and impregnated with the resin;
  • Fig. 4 shows the core from Fig. 3 provided with three coils, around which a shell has been fitted made up of two shell parts, having, therefore two, in this case axially extending, slots.
  • Fig. 1 shows in cross sectional partial front view an actuator 1 according to the invention.
  • the actuator 1 consists of a fixed part 2 and a moving part 15 received therein.
  • the moving part 15 can be connected to the outside world via, optionally, a first rod 4 and, optionally, a second rod 18. With, for instance, so- called “shakers", the two rods can both, optionally, be completely omitted.
  • On rod 4 and/or 18 a vibration from, for instance, the outside can act, which has to be actively damped by the actuator 1. It is also conceivable to impose a vibration on the outside world from the actuator 1 via the rods 4 and/or 18.
  • the fixed part 2 can be connected to the outside world via, optionally, a flange 8.
  • the fixed part 2 can also function as a moving part, while the moving part 15 can also function as fixed part. All this will be dependent on the manner in which the actuator 1 is connected to the outside world/surroundings.
  • the fixed part 2 consists of a core 3 of non-magnetic material with three coils 4, 5 and 6 thereon and, around these coils 4, 5 and 6, a shell 7.
  • the electromagnetic coils 4 and 6 have the same orientation and the coil 5 has exactly the opposite orientation.
  • Such a configuration of coils can be achieved by a suitable connection to an electric source.
  • this orientation can also be achieved by winding the coils 4, 5 and 6 from one and the same wire and, in doing so, to make the winding direction of the coils 4 and 6 identical, and the winding direction of the coil 5 exactly the opposite.
  • the wire from which the coils 4, 5 and 6 have been wound will be a metal wire, preferably a copper wire or aluminum wire.
  • the shell 7 is manufactured from a ferromagnetic material, for instance a suitable type of steel.
  • the core 3 is of a cylindrical hollow design.
  • the core 3 can have an oval, square, rectangular or differently shaped hollow cross section.
  • the moving part 15 of the actuator 1 is received in the hollow core 3.
  • This moving part 15 consists of two permanent magnets 9, the upper one in Fig. 1 and 10, the lower one in Fig. 1.
  • the lower permanent magnet 10 has its South pole turned downwards and its North pole turned upwards
  • the upper permanent magnet 9 has its South pole turned upwards and its North pole turned downwards. It is of primary importance that the permanent magnet 9 and 10 have their equivalent poles turned towards each other, although also configurations are conceivable wherein the non-equivalent poles face each other.
  • a disc of ferromagnetic material is present.
  • the moving part 15 of the actuator 1 is suspended in the core 3 by means of a lower spring 12 and an upper spring 13.
  • the springs 12 and 13 are leaf springs.
  • the leaf springs 12 and 13 are connected on the one side to the rods 18, 4, respectively, and, on the other side, to the core 3.
  • the moving part 15 of the actuator 1 is further provided with a ferromagnetic disc 16 and 17.
  • the distance 'd' is the distance from the moving part 15 of the actuator to the ferromagnetic shell 7.
  • the thicknesses of the outer ferromagnetic discs 16 and 17 are mutually equal and indicated with 'h'.
  • the thickness of the middle ferromagnetic disc 11 is indicated with the letter 'f .
  • the leaf springs 12 and 13 can be designed in accordance with the design of a Dutch patent application of appHcant filed simultaneously with the present one, but can also be designed according to a different design, such as the design known from Fig. 3 of DE- 19823716.
  • Fig. 2 shows a core 3 as represented in Fig. 1.
  • the core 3 is made of a nonmagnetic material.
  • the core 3 consists of an upper flange 20 and a lower flange 21, which are both provided with bolt passages for, later, fastening leaf springs 12 and 13 thereto; between the flanges 20 and 21, a cylindrical part 22 extends with two thickened edges 23 and 24 forming one part therewith and extending in circumferential direction.
  • the thickened edges 23 and 24 do not extend uninterruptedly around the cylindrical part 22 but are each provided with at least one interruption 25.
  • These interruptions 25 are, for one thing, favorable for the prevention of "Eddy Currents". These interruptions further make it possible to, later, form three coils from one wire and, via the interruptions 25, guide the wire from the one coil to the other coil, but, in the mean time, to reverse the winding direction.
  • the core 3 is provided with at least one coil, in the present example three coils.
  • the recessed zones 26, 27 and 28 of the core 3 are wound with a metal wire, preferably a copper wire or aluminum wire.
  • the winding is done around the central coil axis 35, which also determines the axial direction.
  • Fig. 3 shows in the zone 26 a coil 29, in the zone 27 a coil 30 and in the zone 28 a coil 31.
  • the coils 29, 30 and 31 are impregnated with a resin.
  • a shell is provided around the coils, which shell is built up from two semi-cylindrical shell parts 32 and 33 which are separated by two slots 34 (of which only one is visible in Fig. 4). Then, the arrangement is placed into an oven to harden at a temperature of, for instance, 180°C. During this hardening, gasses can escape from the resin via the slots 34. What is thus prevented is that bubbles are entrapped within the coil or between the coil and the shell. The hardening takes place at, for instance, a temperature of approximately 80°C. It will be clear that the shell parts 32 and 33 are kept together by fastening means such as a belt or tape extending all around (not shown), or tangentially arranged bolts.
  • fastening means such as a belt or tape extending all around (not shown), or tangentially arranged bolts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Electromagnets (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

La présente invention se rapporte à un procédé de fabrication d'un bobine électromagnétique destinée, notamment, à un actionneur, tel qu'un amortisseur actif. Elle se rapporte également à dispositif obtenu conformément audit procédé et à un actionneur. Le procédé comporte les étapes a), b), c) et d). Au cours de l'étape a) un film métallique est enroulé sur un noyau de manière à former une bobine. Au cours de l'étape b) la bobine est imprégnée d'une résine. Au cours de l'étape c) un manchon comportant une ou plusieurs fentes disposées suivant la direction axiale est placé autour de la bobine imprégnée de résine. Au cours de l'étape d), on laisse la résine durcir dans une situation où elle se trouve placée à l'intérieur du manchon.
PCT/NL2002/000112 2001-02-22 2002-02-22 Procede de fabrication d'une bobine electromagnetique, dispositif obtenu conformement audit procede et actionneur WO2002067277A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1017426 2001-02-22
NL1017426A NL1017426C2 (nl) 2001-02-22 2001-02-22 Werkwijze voor het vervaardigen van een elektromagnetische spoel, inrichting verkregen met de werkwijze alsmede actuator.

Publications (2)

Publication Number Publication Date
WO2002067277A1 true WO2002067277A1 (fr) 2002-08-29
WO2002067277A8 WO2002067277A8 (fr) 2003-11-13

Family

ID=19772946

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2002/000112 WO2002067277A1 (fr) 2001-02-22 2002-02-22 Procede de fabrication d'une bobine electromagnetique, dispositif obtenu conformement audit procede et actionneur

Country Status (2)

Country Link
NL (1) NL1017426C2 (fr)
WO (1) WO2002067277A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU521297B2 (en) * 1978-11-01 1982-03-25 English Electric Co. Ltd., The Encapsulated high voltage windings
EP0103237A2 (fr) * 1982-09-14 1984-03-21 Transformatoren Union Aktiengesellschaft Procédé de fabrication d'enroulements encapsulés en résine pour transformateurs
JPS61102715A (ja) * 1984-10-26 1986-05-21 Hitachi Ltd トロイダル磁場コイルの製作方法
WO1992005568A1 (fr) * 1990-09-21 1992-04-02 Coilcraft, Inc. Dispositif inductif et procede de fabrication
US5633019A (en) * 1993-07-28 1997-05-27 Cooper Industries, Inc. Encapsulated transformer, method of making encapsulated transformer and apparatus for making encapsulated transformer
JP2000173820A (ja) * 1998-12-09 2000-06-23 Mic Latex Kk カ―エアコンのコンプレッサ―用の電磁クラッチに用いるコイル装置及び該コイル装置の製造方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19823716A1 (de) 1998-05-27 1999-12-02 Btr Avs Technical Centre Gmbh Aktiver Schwingungstilger

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU521297B2 (en) * 1978-11-01 1982-03-25 English Electric Co. Ltd., The Encapsulated high voltage windings
EP0103237A2 (fr) * 1982-09-14 1984-03-21 Transformatoren Union Aktiengesellschaft Procédé de fabrication d'enroulements encapsulés en résine pour transformateurs
JPS61102715A (ja) * 1984-10-26 1986-05-21 Hitachi Ltd トロイダル磁場コイルの製作方法
WO1992005568A1 (fr) * 1990-09-21 1992-04-02 Coilcraft, Inc. Dispositif inductif et procede de fabrication
US5633019A (en) * 1993-07-28 1997-05-27 Cooper Industries, Inc. Encapsulated transformer, method of making encapsulated transformer and apparatus for making encapsulated transformer
JP2000173820A (ja) * 1998-12-09 2000-06-23 Mic Latex Kk カ―エアコンのコンプレッサ―用の電磁クラッチに用いるコイル装置及び該コイル装置の製造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 283 (E - 440) 26 September 1986 (1986-09-26) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 09 13 October 2000 (2000-10-13) *

Also Published As

Publication number Publication date
WO2002067277A8 (fr) 2003-11-13
NL1017426C2 (nl) 2002-08-23

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