EP0080974A1 - Method for the construction of a coil for micro-motors, and coil having an external protection - Google Patents

Method for the construction of a coil for micro-motors, and coil having an external protection 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
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EP
European Patent Office
Prior art keywords
coil
winding
envelope
core
ribbon
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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.)
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Application number
EP82810493A
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German (de)
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
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FABRIQUES D'HORLOGERIE DE FONTAINEMELON SA
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Publication of EP0080974A1 publication Critical patent/EP0080974A1/en
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    • 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)

Abstract

To improve the protection of the coil, a cylindrical envelope (10), the ends (10') of which overhang the winding, is made around the winding (8) of the coil. The envelope is made from a heat-shrinkable material. By heating the assembly, the ends (10') fold down over the end faces (8b) and (8c) of the winding. Thus, complete protection of the coil is obtained. This method is well suited for protecting the coils of stepped micromotors for watches. <IMAGE>

Description

La présente invention a pour objet un procédé de réalisation d'une bobine pour micro-moteur et une bobine de micro-moteur munie d'une protection externe.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.

De façon plus précise, la présente invention concerne la protection externe de bobines utilisées dans les micro-moteurs et en particulier dans les moteurs pas à pas qui sont maintenant courants dans les montres analogiques électroniques. La structure des bobines pour micro-moteur est bien connue. Elle se compose d'un noyau magnétique de forme allongée, terminé en général par deux oreilles servant à raccorder le noyau au reste du circuit magnétique du stator du moteur. Sur le noyau proprement dit est bobiné un enroulement d'un fil conducteur. L'enroulement une fois terminé a la forme générale d'un cylindre, les deux extrémités du fil étant sorties pour permettre l'alimentation de la bobine. Le fil conducteur utilisé pour réaliser la bobine est extrêmement fin, de l'ordre de 2 à 3 1/100èmes de mm. En conséquence, lors du montage de la bobine sur le stator ou encore lors du montage du moteur dans le mouvement, le moindre choc ou le moindre coup appliqué sur la face latérale ou sur les faces d'extrémité de la bobine peut entraîner une rupture du fil ou la création d'un court-circuit rendant la bobine inutilisable.More specifically, 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.

C'est pourquoi, on prévoit parfois une protection externe de la bobine jouant seulement un rôle de protection mécanique. Dans un premier cas, cette protection externe se limite à un tube entourant la face latérale de la bobine. Cependant dans ce cas, les faces d'extrémité de la bobine ne sont pas protégées et une action intempestive de l'outil servant par exemple à fixer le noyau de bobine sur le reste du stator risque d'abîmer la bobine dans ses faces d'extrémité.This is why, an external protection of the coil is sometimes provided, playing only a mechanical protection role. In a first case, this external protection is limited to a tube surrounding the lateral face of the coil. However in this case, 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.

Pour remédier à cet inconvénient, il a été proposé de compléter la protection latérale externe de la bobine par deux flasques indépendants qui sont interposés entre les oreilles et les faces d'extrémité de la bobine. Ces flasques assurent ainsi effectivement la protection des faces d'extrémité de la bobine. Cependant une telle technique présente l'inconvénient majeur de nécessiter la mise en oeuvre d'un grand nombre d'opérations supplémentaires lors de la fabrication de la bobine. En outre, l'une des extrémités du fil qui sert à l'alimentation de la bobine sort à la périphérie externe de celle-ci, il est donc nécessaire de prévoir dans un des flasques une fente ou une autre disposition pour permettre l'engagement de cette extrémité du fil. Cela complique encore les opérations.To remedy this drawback, it has been proposed to supplement the external lateral protection of the coil with two independent flanges which are interposed between the ears and the end faces of the coil. These flanges thus effectively protect the end faces of the coil. However, such a technique has the major drawback of requiring the implementation of a large number of additional operations during the manufacture of the coil. In addition, one of the ends of the wire which serves to supply the coil exits at the external periphery thereof, it is therefore necessary to provide in one of the flanges a slot or other arrangement to allow engagement from this end of the wire. This further complicates operations.

La présente invention a précisément pour objet la réalisation d'une protection externe de bobine pour micro-moteur qui évite les inconvénients des techniques de l'art antérieur tout en assurant une bonne protection de la bobine y compris en ce qui concerne ses faces d'extrémité.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.

Pour atteindre ces buts, l'invention concerne d'abord un procédé de fabrication d'une bobine pour micro-moteur qui se caractérise en ce qu'on part d'un noyau magnétique de forme allongée; on enroule sur le noyau un fil conducteur pour réaliser un enroulement ayant la forme générale d'un cylindre dont la longueur 1 est parallèle au noyau et qui présente une face latérale cylindrique et deux faces d'extrémité en forme circulaire; on entoure l'enroulement d'une enveloppe cylindrique en un matériau thermorétractable ayant une longueur l' supérieure à la longueur I de l'enroulement pour que les extrémités de l'enveloppe débordent de l'enroulement, cette enveloppe ayant par ailleurs un diamètre sensiblement égal à celui de l'enroulement; enfin on chauffe l'ensemble constitué par la bobine munie de son enveloppe pour provoquer la rétraction du matériau thermorétractable. La portion de l'enveloppe qui est appliquée contre la bobine est empêchée de se rétracter. Au contraire les deux extrémités de l'enveloppe débordant de l'enroulement se rabattent pour recouvrir .la périphérie des faces d'extrémité.To achieve these goals, 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.

On voit qu'ainsi, on obtient non seulement un revêtement formant protection mécanique de la face latérale de la bobine mais également une protection mécanique sur la périphérie des faces d'extrémité et en particulier de l'angle entre la face latérale et les faces d'extrémité. Ce revêtement partiel de la périphérie des faces d'extrémité est suffisant pour protéger la bobine et en particulier ses faces d'extrémité contre des manipulations intempestives lors de la manipulation ou du montage de la bobine.It can be seen that thus, one obtains not only a coating forming mechanical protection of the lateral face of the coil but also mechanical protection on the periphery of the end faces and in particular of the angle between the lateral face and the faces d 'end. This partial coating of the periphery of the end faces is sufficient to protect the coil and in particular its end faces against untimely handling during handling or mounting of the coil.

De préférence, le matériau thermorétractable est un polyester et son épaisseur est comprise entre 2,5 et 30 pm.Preferably, the heat-shrinkable material is a polyester and its thickness is between 2.5 and 30 μm.

Pour la réalisation de l'enveloppe de protection, on utilise de préférence un matériau thermorétractable autocollant sur une de ses faces et l'enveloppe est réalisée en entourant l'enroulement avec une bande de ce matériau ayant une largeur l' supérieure à la longueur I de la bobine, de telle sorte que la deuxième extrémité libre de la bande recouvre la première extrémité de cette bande et adhère sur celle-ci.For the production of the protective envelope, preferably 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.

L'invention concerne également une bobine pour micro-moteur comprenant un noyau magnétique de forme allongée, un enroulement ayant une forme sensiblement cylindrique présentant deux faces d'extrémité et une face latérale et des moyens de protection externe, qui se caractérise en ce que ces moyens de protection consistent en une couche d'un matériau plastique formée d'une seule pièce qui s'étend sur la totalité de la face latérale de l'enroulement et qui recouvre de plus la périphérie des deux faces d'extrémité de cet enroulement.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.

D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lecture de la description qui suit de plusieurs modes de réalisation de l'invention donnés à titre d'exemple non limitatif.Other characteristics and advantages of the invention will appear more clearly on reading the following description of several embodiments of the invention given by way of non-limiting example.

La description se réfère au dessin sur lequel :

  • - la figure 1 est une vue de dessus d'une bobine pour micro-moteur munie d'une protection externe selon l'invention;
  • - la figure 2 est une vue en section selon le plan II-II de la figure 1, lors d'une étape intermédiaire du procédé de réalisation de la protection externe;
  • - la figure 3 est une section selon la ligne III-III de la figure 1; et
  • - la figure 4 est une section selon la ligne IV-IV de la figure 1.
The description refers to the drawing in which:
  • - Figure 1 is a top view of a coil for micro-motor provided with an external protection according to the invention;
  • - Figure 2 is a sectional view along the plane II-II of Figure 1, during an intermediate step of the method of making the external protection;
  • - Figure 3 is a section along line III-III of Figure 1; and
  • - Figure 4 is a section along line IV-IV of Figure 1.

La figure 1 montre en vue de dessus une bobine munie d'une protection externe selon l'invention. La bobine comporte un noyau magnétique de forme allongée 2 prolongé à ses extrémités par des oreilles 4 et 6 servant à la fixation du noyau dans le reste du circuit magnétique du stator. Sur la majeur partie du noyau proprement dit 2 est bobiné un enroulement 8 en fil conducteur dont la forme générale extérieure est un cylindre ayant une paroi latérale 8a et des faces d'extrémité 8b et 8c. Sur cet enroulement 8 est réalisé une protection externe constituée par une enveloppe 10 qui comprend une portion cylindrique 10a disposée sur la face latérale 8a de l'enroulement 8 et deux portions rabattues 10b et 10c, Les portiona rabattues font partie intégrante de l'enveloppe de protection 10 et recouvrent chacune la périphérie de la face d'extrémité 8b respectivement 8c de l'enroulement. De préférence, l'enveloppe de protection 10 est réalisée en un matériau synthétique. L'épaisseur de ce matériau est par exemple de l'ordre de 15 à 20 microns, plus généralement cette épaisseur peut être comprise entre 2,5 et 30 microns. On voit qu'ainsi l'enveloppe externe de protection 10 recouvre la totalité de la surface latérale et la périphérie des faces d'extrémité, c'est-à-dire qu'elle recouvre en particulier le congé de raccordement 8d entre la face latérale 8a de l'enroulement et les faces d'extrémité 8b,8c ou arêtes de la bobine. Dans le' cas d'une bobine ayant une longueur 1 de 8,25 mm et un diamètre extérieur de 2,70 mm, les zones rabattues telles que 10b ont par exemple- une largeur e de l'ordre de 0,5 mm ou plus généralement comprise entre 0,3 et 0,7 mm. On réalise ainsi une très bonne protection mécanique externe de l'enroulement. Cette protection, comme on l'a déjà indiqué, est particulièrement importante lors des opérations de montage de la bobine sur les restes du stator par exemple, afin de protéger le fil de l'enroulement contre des manoeuvres intempestives effectuées avec les outils de montage. Il est clair en effet qu'une rupture du fil ou qu'un écrasement de ce fil peut entraîner des court-circuits qui rendraient la bobine inutilisable.Figure 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. On the major part of the actual core 2 is wound a winding 8 in conductive wire whose general external shape is a cylinder having a side wall 8a and end faces 8b and 8c. On this winding 8 is produced 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. Preferably, 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. In the case of a coil having a length 1 of 8.25 mm and an outside diameter of 2.70 mm, 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, as already indicated, 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.

On va maintenant décrire un procédé particulièrement bien adapté pour réaliser la protection externe représentée sur la figure 1. On part d'une bobine constituée par le noyau 2 et ses oreilles 4, l'oreille 4 étant par exemple munie d'un circuit imprimé 12 fixé sur cette oreille et comportant les pistes conductrices 12a et 12b. La bobine comporte également l'enroulement de forme générale cylindrique 8 dont la longueur parallèlement au noyau est égale à I. Pour assurer l'alimentation de cette bobine, une des extrémités d'un fil conducteur 14 qui vient de la périphérie externe de l'enroulement est reliée à une première piste du circuit imprimé 12a alors que la deuxième extrémité du fil référencée 16 est reliée à la piste conductrice 12b du circuit imprimé. Dans une première étape qui est illustrée par la figure 2, on réalise autour de l'enroulement 8 une enveloppe 10 en un matériau plastique thermorétractable qui forme un manchon dont la longueur l' est supérieure à la longueur de l'enroulement. En outre, le diamètre de l'enveloppe 10 est égal au diamètre externe de l'enroulement 8. En d'autres termes, une partie de l'enveloppe est en appui sur la face latérale 8a de l'enroulement alors que les extrémités 10' de l'enveloppe débordent de l'enroulement 8. Il existe plusieurs façons de réaliser l'enveloppe 10. Par exemple, on peut utiliser un matériau thermorétractable qui comporté de plus une face interne autocollante.We will now describe a process which is particularly well suited for producing the external protection shown in FIG. 1. We start with 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. To ensure the supply of this coil, 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. In a first step which is illustrated in FIG. 2, 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. In addition, the diameter of the casing 10 is equal to the external diameter of the winding 8. In other words, 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. There are several ways of making the envelope 10. For example, it is possible to use a heat-shrinkable material which further comprises an adhesive internal face.

Un produit particulièrement bien adapté est un ruban isolant en polyester d'épaisseur 0,02 mm vendu sous la marque "SCOTCH" du type 74.A particularly suitable product is a 0.02 mm thick polyester insulating tape sold under the brand "SCOTCH" of type 74.

Comme le montre la figure 3, l'enveloppe est alors réalisée par le fait que l'un des bords 10'a de la bande servant à réaliser l'enveloppe 10 recouvre la deuxième extrémité 10'b de cette même bande, l'extrémité 10'a adhérant ainsi à l'extrémité 10'b. On réalise ainsi effectivement une enveloppe cylindrique dont le diamètre est sensiblement égal au diamètre externe de l'enroulement 8.As shown in FIG. 3, 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. This effectively produces a cylindrical envelope whose diameter is substantially equal to the external diameter of the winding 8.

Dans une deuxième étape, l'ensemble constitué par la bobine avec son enveloppe cylindrique 10 est chauffé. Par exemple, il est placé dans une enceinte à air chaud pulsé à environ 150° pendant 2,5 à 3 secondes.In a second step, the assembly constituted by the coil with its cylindrical envelope 10 is heated. For example, it is placed in an enclosure with hot air pulsed at approximately 150 ° for 2.5 to 3 seconds.

Il faut remarquer que le noyau 2 doit être électriquement isolé de l'enroulement 8. Une solution intéressante consiste à recouvrir le noyau 2 avec un ruban isolant autocollant 20. Ce ruban est constitué de préférence par le même matériau que celui qui sert à réaliser l'isolation externe. Comme le montre la figure 3, le ruban 20 entoure le noyau et l'une de ses extrémités 20a recouvre l'autre extrémité 20b pour assurer la continuité de l'isolation. De même, comme le montre la figure 1, le ruban 20 déborde des extrémités de l'enroulement 8.It should be noted that 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. As shown in Figure 3, the ribbon 20 surrounds the core and one of its ends 20a covers the other end 20b to ensure continuity of the insulation. Likewise, as shown in FIG. 1, the ribbon 20 projects beyond the ends of the winding 8.

Il découle de la description précédente que l'invention permet effectivement de résoudre le problème posé dans des conditions économiques intéressantes. On obtient une protection mécanique efficace de l'ensemble de la bobine et, en particulier des "coins" 8d de l'enroulement. Cependant, cette protection ne requiert la mise en oeuvre que d'étapes simples qui sont tout à fait compatibles avec une production en grande série. Sous l'effet de ce chauffage, et en raison des propriétés du matériau formant l'enveloppe, il se produit une rétraction globale de celui-ci. Sur la partie centrale de l'enveloppe qui est au contact de la face latérale de l'enroulement, cette rétraction est bien sûr contrariée. Au contraire aux extrémités 10' de cette enveloppe qui débordent de l'enroulement, la rétraction du matériau provoque le rabattement des extrémités 10' qui viennent ainsi se plaquer de façon durable sur la périphérie. Des faces d'extrémité 8c et 8b de l'enroulement, comme le montre la figure 4. Ce rabattement protège en particulier les congés ou arêtes de raccordement 8d de l'enroulement. Il est important d'observer par ailleurs que l'extrémité du fil conducteur 14 qui part de la périphérie externe de l'enroulement provoque une légère déformation de la portion rabattue 10b dans la zone 10". Cette extrémité est ainsi parfaitement protégée sans qu'il y ait à prévoir des dispositions particulières.It follows from the above description that the invention effectively makes it possible to solve the problem posed under advantageous economic conditions. Effective mechanical protection is obtained for the entire coil and, in particular for the "corners" 8d of the winding. However, this protection only requires the implementation of simple steps which are entirely compatible with mass production. Under the effect of this heating, and due to the properties of the material forming the envelope, there is an overall retraction thereof. On the central part of the envelope which is in contact with the lateral face of the winding, this retraction is of course thwarted. On the contrary to the ends 10 ′ of this envelope which protrude from the winding, the retraction of the material causes the ends 10 ′ to be folded down which thus come to be pressed permanently on the periphery. End faces 8c and 8b of the winding, as shown in FIG. 4. This drawdown protects in particular the fillets or connection edges 8d of the winding. It is also important to observe that the end of the conducting wire 14 which leaves from the external periphery of the winding causes a slight deformation of the folded portion 10b in the area 10 ". This end is thus perfectly protected without any special provisions have to be made.

Dans certains cas la bobine peut ne pas comporter de circuits imprimés. Les extrémités 14 et 16 du fil de bobine et en particulier l'extrémité 14 est libre. Il suffit par tout moyen adapté, de déformer les extrémités 14 et 16 pour les amener dans une position similaire à celle qu'ils occupent sur la figure 2, afin de dégager la face latérale de l'enroulement. Dans cette situation, la protection externe peut être réalisée comme décrit précédemment.In some cases 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.

Claims (7)

1. Procédé de fabrication d'une bobine pour micro-moteur, caractérisé en ce qu'il comprend les étapes suivantes : - on fournit un noyau magnétique (2) de forme allongée; - on enroule sur ledit noyau un fil conducteur pour former un enroulement (8) de forme générale cylindrique dont la longueur I est parallèle au noyau et qui présente une face latérale (8a) et deux faces d'extrémité (8b, 8c); - on forme autour dudit enroulement (8) une enveloppe (10) sensiblement cylindrique en un matériau thermorétractable ayant une longueur l' supérieure à la longueur pour que les extrémités (10') de ladite enveloppe débordent dudit enroulement, et ayant un diamètre sensiblement égal à celui dudit enroulement; - on chauffe ladite bobine munie de l'enveloppe pour provoquer la rétraction des extrémités débordantes (10') de l'enveloppe et leur rabattement sur la périphérie (8d) desdites faces d'extrémité. 1. Method of manufacturing a coil for micro-motor, characterized in that it comprises the following stages: - providing a magnetic core (2) of elongated shape; - A conductive wire is wound on said core to form a winding (8) of generally cylindrical shape whose length I is parallel to the core and which has a lateral face (8a) and two end faces (8b, 8c); - A substantially cylindrical envelope (10) is made around said winding (8) in a heat-shrinkable material having a length greater than the length so that the ends (10 ') of said envelope project beyond said winding, and having a substantially equal diameter to that of said winding; - Heating said coil provided with the envelope to cause the retraction of the projecting ends (10 ') of the envelope and their drawdown on the periphery (8d) of said end faces. 2. Procédé selon la revendication 1, caractérisé en ce que ledit matériau est un polyester dont l'épaisseur est comprise entre 2,5 et 30 pm.2. Method according to claim 1, characterized in that said material is a polyester whose thickness is between 2.5 and 30 pm. 3. Procédé selon la revendication 2, caractérisé en ce que pour former ladite enveloppe (10), on utilise un ruban dudit matériau dont une face est autocollante et en ce qu'on entoure ledit enroulement (8) avec une portion de ruban dudit matériau, la deuxième extrémité de la portion de ruban recouvrant ladite première extrémité et adhérant à celle-ci.3. Method according to claim 2, characterized in that to form said envelope (10), a ribbon of said material is used, one face of which is self-adhesive and in that said winding (8) is surrounded with a portion of ribbon of said material. , the second end of the portion of ribbon covering said first end and adhering to it. 4. Procédé selon l'une quelconques des revendications 2 et 3, caractérisé en ce que ledit matériau est en outre un isolant électrique et en ce que ledit noyau magnétique (2) est recouvert d'une couche (20) dudit matériau.4. Method according to any one of claims 2 and 3, characterized in that said material is also an electrical insulator and in that said magnetic core (2) is covered with a layer (20) of said material. 5. Bobine pour micro-moteur comprenant un noyau magnétique (2) de forme allongée, un enroulement (8) de fil conducteur réalisé sur ledit noyau et ayant une forme sensiblement cylindrique présentant une surface latérale (8a) et deux faces d'extrémité (8b, 8c) et une protection externe, caractérisée en ce que ladite protection consiste en une couche (10) de matériau plastique formée d'une seule pièce recouvrant ladite surface latérale (8a) et au moins la périphérie (8d) desdites faces d'extrémité (8b, 8c).5. Coil for micro-motor comprising a magnetic core (2) of elongated shape, a winding (8) of conductive wire produced on said core and having a substantially cylindrical shape having a lateral surface (8a) and two end faces ( 8b, 8c) and an external protection, characterized in that said protection consists of a layer (10) of plastic material formed in one piece covering said lateral surface (8a) and at least the periphery (8d) of said faces end (8b, 8c). 6. Bobine selon la revendication 5, caractérisée en ce que ledit matériau est un polyester thermorétractable.6. Coil according to claim 5, characterized in that said material is a heat shrinkable polyester. 7. Bobine selon l'une quelconques des revendications 5 et 6, caractérisée en ce que ladite couche est constituée par une portion d'un ruban qui entoure ledit enroulement, une extrémité dudit ruban recouvrant l'autre extrémité et y adhérant.7. Coil according to any one of claims 5 and 6, characterized in that said layer is constituted by a portion of a ribbon which surrounds said winding, one end of said ribbon covering the other end and adhering thereto.
EP82810493A 1981-12-01 1982-11-17 Method for the construction of a coil for micro-motors, and coil having an external protection Withdrawn EP0080974A1 (en)

Applications Claiming Priority (2)

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

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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

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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 (en) * 1964-02-04 1964-12-04 Blaupunkt Werke Gmbh Winding method of an electric winding
FR1406459A (en) * 1963-01-21 1965-07-23 Siemens Ag High voltage resistant insulation for electrical machine windings
FR1462843A (en) * 1965-01-06 1966-12-16 Licentia Gmbh Winding for transformers and reaction coils in conductive foil
FR2043235A5 (en) * 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 (en) * 1963-01-21 1965-07-23 Siemens Ag High voltage resistant insulation for electrical machine windings
FR1381168A (en) * 1964-02-04 1964-12-04 Blaupunkt Werke Gmbh Winding method of an electric winding
FR1462843A (en) * 1965-01-06 1966-12-16 Licentia Gmbh Winding for transformers and reaction coils in conductive foil
FR2043235A5 (en) * 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
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