EP0080974A1 - Verfahren zur Herstellung von Spulen für Mirkomotoren und Spule mit Schutzhülle - Google Patents

Verfahren zur Herstellung von Spulen für Mirkomotoren und Spule mit Schutzhülle Download PDF

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Publication number
EP0080974A1
EP0080974A1 EP82810493A EP82810493A EP0080974A1 EP 0080974 A1 EP0080974 A1 EP 0080974A1 EP 82810493 A EP82810493 A EP 82810493A EP 82810493 A EP82810493 A EP 82810493A EP 0080974 A1 EP0080974 A1 EP 0080974A1
Authority
EP
European Patent Office
Prior art keywords
coil
winding
envelope
core
ribbon
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Withdrawn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
EP82810493A
Other languages
English (en)
French (fr)
Inventor
Victor Bruzzo
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.)
FABRIQUES D'HORLOGERIE DE FONTAINEMELON SA
Original Assignee
FABRIQUES D'HORLOGERIE DE FONTAINEMELON 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 FABRIQUES D'HORLOGERIE DE FONTAINEMELON SA filed Critical FABRIQUES D'HORLOGERIE DE FONTAINEMELON SA
Publication of EP0080974A1 publication Critical patent/EP0080974A1/de
Withdrawn legal-status Critical Current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
    • 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
    • H01F41/125—Other insulating structures; Insulating between coil and core, between different winding sections, around the coil

Definitions

  • the present invention relates to a method of producing a coil for a micro-motor and a micro-motor coil provided with an external protection.
  • the present invention relates to the external protection of coils used in micro-motors and in particular in stepping motors which are now common in analog electronic watches.
  • the structure of coils for micro-motor is well known. It consists of a magnetic core of elongated shape, generally terminated by two ears used to connect the core to the rest of the magnetic circuit of the stator of the motor.
  • On the core itself is wound a winding of a conductive wire.
  • the winding when finished has the general shape of a cylinder, the two ends of the wire being extended to allow the supply of the coil.
  • the wire used to make the coil is extremely thin, of the order of 2 to 3 1 / 100ths of a mm. Consequently, when mounting the coil on the stator or when mounting the motor in motion, the slightest shock or the slightest blow applied to the lateral face or to the end faces of the coil can cause the wire or creating a short circuit making the coil unusable.
  • an external protection of the coil is sometimes provided, playing only a mechanical protection role.
  • this external protection is limited to a tube surrounding the lateral face of the coil.
  • the end faces of the coil are not protected and an untimely action of the tool used for example to fix the core of the coil on the rest of the stator risks damaging the coil in its faces. end.
  • the present invention specifically relates to the realization of an external coil protection for micro-motor which avoids the drawbacks of the techniques of the prior art while ensuring good protection of the coil including with regard to its faces. end.
  • the invention firstly relates to a method of manufacturing a coil for micro-motor which is characterized in that one starts from a magnetic core of elongated shape; a conductive wire is wound on the core to produce a winding having the general shape of a cylinder whose length 1 is parallel to the core and which has a cylindrical side face and two end faces in circular shape; the winding is surrounded by a cylindrical envelope made of a heat-shrinkable material having a length greater than the length I of the winding so that the ends of the envelope extend beyond the winding, this envelope also having a diameter that is substantially equal to that of the winding; finally, the assembly formed by the coil provided with its envelope is heated to cause the shrinkage of the heat-shrinkable material. The portion of the envelope that is applied against the spool is prevented from shrinking. On the contrary, the two ends of the envelope projecting from the winding fold down to cover the periphery of the end faces.
  • the heat-shrinkable material is a polyester and its thickness is between 2.5 and 30 ⁇ m.
  • a self-adhesive heat-shrinkable material is used on one of its faces and the envelope is produced by surrounding the winding with a strip of this material having a width greater than the length I of the coil, so that the second free end of the strip covers the first end of this strip and adheres to it.
  • the invention also relates to a coil for micro-motor comprising a magnetic core of elongated shape, a winding having a substantially cylindrical shape having two end faces and a side face and external protection means, which is characterized in that these protective means consist of a layer of plastic material formed in one piece which extends over the entire side face of the winding and which also covers the periphery of the two end faces of this winding.
  • FIG. 1 shows a top view of a coil provided with an external protection according to the invention.
  • the coil has an elongated magnetic core 2 extended at its ends by ears 4 and 6 used to fix the core in the rest of the stator's magnetic circuit.
  • a winding 8 in conductive wire whose general external shape is a cylinder having a side wall 8a and end faces 8b and 8c.
  • an external protection constituted by an envelope 10 which comprises a cylindrical portion 10a disposed on the lateral face 8a of the winding 8 and two folded portions 10b and 10c,
  • the folded portiona are an integral part of the envelope protection 10 and each cover the periphery of the end face 8b respectively 8c of the winding.
  • the protective envelope 10 is made of a synthetic material.
  • the thickness of this material is for example of the order of 15 to 20 microns, more generally this thickness can be between 2.5 and 30 microns. It can be seen that thus the external protective envelope 10 covers the entire lateral surface and the periphery of the end faces, that is to say that it covers in particular the connection leave 8d between the lateral face 8a of the winding and the end faces 8b, 8c or edges of the coil.
  • the folded areas such as 10b have for example a width e of the order of 0.5 mm or more generally between 0.3 and 0.7 mm. This provides very good external mechanical protection of the winding.
  • This protection is particularly important during assembly operations of the coil on the remains of the stator for example, in order to protect the wire from the winding against untimely maneuvers carried out with the assembly tools. It is indeed clear that a break in the wire or that a crushing of this wire can cause short circuits which would render the coil unusable.
  • FIG. 1 We will now describe a process which is particularly well suited for producing the external protection shown in FIG. 1.
  • a coil constituted by the core 2 and its ears 4, the ear 4 being for example provided with a printed circuit 12 fixed on this ear and comprising the conductive tracks 12a and 12b.
  • the coil also comprises the generally cylindrical winding 8 whose length parallel to the core is equal to I.
  • one of the ends of a conducting wire 14 which comes from the external periphery of the winding is connected to a first track of the printed circuit 12a while the second end of the wire referenced 16 is connected to the conductive track 12b of the printed circuit.
  • a first step which is illustrated in FIG.
  • an envelope 10 is made around the winding 8 in a heat-shrinkable plastic material which forms a sleeve the length of which is greater than the length of the winding.
  • the diameter of the casing 10 is equal to the external diameter of the winding 8.
  • part of the casing is supported on the lateral face 8a of the winding while the ends 10 'of the envelope protrude from the winding 8.
  • a heat-shrinkable material which further comprises an adhesive internal face.
  • a particularly suitable product is a 0.02 mm thick polyester insulating tape sold under the brand "SCOTCH" of type 74.
  • the envelope is then produced by the fact that one of the edges 10'a of the strip used to make the envelope 10 covers the second end 10'b of this same strip, the end 10'a thus adhering to the end 10'b.
  • the assembly constituted by the coil with its cylindrical envelope 10 is heated.
  • it is placed in an enclosure with hot air pulsed at approximately 150 ° for 2.5 to 3 seconds.
  • the core 2 must be electrically isolated from the winding 8.
  • An advantageous solution consists in covering the core 2 with an adhesive insulating tape 20.
  • This tape is preferably made of the same material as that which is used to make the external insulation.
  • the ribbon 20 surrounds the core and one of its ends 20a covers the other end 20b to ensure continuity of the insulation.
  • the ribbon 20 projects beyond the ends of the winding 8.
  • the coil may not include printed circuits.
  • the ends 14 and 16 of the coil wire and in particular the end 14 is free. It suffices by any suitable means to deform the ends 14 and 16 to bring them into a position similar to that which they occupy in FIG. 2, in order to release the lateral face of the winding. In this situation, external protection can be performed as described above.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
EP82810493A 1981-12-01 1982-11-17 Verfahren zur Herstellung von Spulen für Mirkomotoren und Spule mit Schutzhülle Withdrawn EP0080974A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH768381 1981-12-01
CH7683/81 1981-12-01

Publications (1)

Publication Number Publication Date
EP0080974A1 true EP0080974A1 (de) 1983-06-08

Family

ID=4328966

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82810493A Withdrawn EP0080974A1 (de) 1981-12-01 1982-11-17 Verfahren zur Herstellung von Spulen für Mirkomotoren und Spule mit Schutzhülle

Country Status (2)

Country Link
EP (1) EP0080974A1 (de)
JP (1) JPS58103840A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002019353A1 (en) * 2000-08-29 2002-03-07 Abb Ab Electric device
WO2002059920A1 (en) * 2000-12-26 2002-08-01 General Electronic Company Coil and method for making same
WO2009043129A1 (en) * 2007-10-02 2009-04-09 Whirlpool S.A. Process and arrangement for electrically insulating a coil of an electric device

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1506746A (en) * 1920-11-12 1924-09-02 Westinghouse Electric & Mfg Co Field-coil-insulating shield
US2118924A (en) * 1935-11-14 1938-05-31 Western Electric Co Coil and method of making coils
US2195233A (en) * 1938-07-08 1940-03-26 Gen Electric Electrical coil
FR1381168A (fr) * 1964-02-04 1964-12-04 Blaupunkt Werke Gmbh Procédé de bobinage d'un enroulement électrique
FR1406459A (fr) * 1963-01-21 1965-07-23 Siemens Ag Isolement résistant à la haute tension pour les enroulements de machines électriques
FR1462843A (fr) * 1965-01-06 1966-12-16 Licentia Gmbh Enroulement pour transformateurs et bobines de réaction en feuille conductrice
FR2043235A5 (de) * 1969-04-14 1971-02-12 Gen Electric
GB1392453A (en) * 1971-09-11 1975-04-30 Lucas Electrical Co Ltd Stator assemblies for dynamo electric machines

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1506746A (en) * 1920-11-12 1924-09-02 Westinghouse Electric & Mfg Co Field-coil-insulating shield
US2118924A (en) * 1935-11-14 1938-05-31 Western Electric Co Coil and method of making coils
US2195233A (en) * 1938-07-08 1940-03-26 Gen Electric Electrical coil
FR1406459A (fr) * 1963-01-21 1965-07-23 Siemens Ag Isolement résistant à la haute tension pour les enroulements de machines électriques
FR1381168A (fr) * 1964-02-04 1964-12-04 Blaupunkt Werke Gmbh Procédé de bobinage d'un enroulement électrique
FR1462843A (fr) * 1965-01-06 1966-12-16 Licentia Gmbh Enroulement pour transformateurs et bobines de réaction en feuille conductrice
FR2043235A5 (de) * 1969-04-14 1971-02-12 Gen Electric
GB1392453A (en) * 1971-09-11 1975-04-30 Lucas Electrical Co Ltd Stator assemblies for dynamo electric machines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002019353A1 (en) * 2000-08-29 2002-03-07 Abb Ab Electric device
US6917272B2 (en) 2000-08-29 2005-07-12 Abb Ab Electric device
WO2002059920A1 (en) * 2000-12-26 2002-08-01 General Electronic Company Coil and method for making same
WO2009043129A1 (en) * 2007-10-02 2009-04-09 Whirlpool S.A. Process and arrangement for electrically insulating a coil of an electric device

Also Published As

Publication number Publication date
JPS58103840A (ja) 1983-06-21

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19830823

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Effective date: 19841207

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Inventor name: BRUZZO, VICTOR