EP1058278A2 - Wound magnetic circuit - Google Patents

Wound magnetic circuit Download PDF

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Publication number
EP1058278A2
EP1058278A2 EP00810068A EP00810068A EP1058278A2 EP 1058278 A2 EP1058278 A2 EP 1058278A2 EP 00810068 A EP00810068 A EP 00810068A EP 00810068 A EP00810068 A EP 00810068A EP 1058278 A2 EP1058278 A2 EP 1058278A2
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EP
European Patent Office
Prior art keywords
coil
magnetic
mandrel
magnetic core
magnetic circuit
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.)
Granted
Application number
EP00810068A
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German (de)
French (fr)
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EP1058278B1 (en
EP1058278A3 (en
Inventor
Frédéric CATTANEO
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Liaisons Electroniques Mecaniques LEM SA
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Liaisons Electroniques Mecaniques LEM SA
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Publication of EP1058278A2 publication Critical patent/EP1058278A2/en
Publication of EP1058278A3 publication Critical patent/EP1058278A3/en
Application granted granted Critical
Publication of EP1058278B1 publication Critical patent/EP1058278B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F17/062—Toroidal core with turns of coil around it
    • 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
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • 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
    • H01F41/06—Coil winding
    • H01F41/08—Winding conductors onto closed formers or cores, e.g. threading conductors through toroidal cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49073—Electromagnet, transformer or inductor by assembling coil and core
    • 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
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/532—Conductor
    • 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
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/53257—Means comprising hand-manipulatable implement

Definitions

  • the present invention relates to a wound magnetic circuit and a method of manufacture of such a circuit.
  • Wound magnetic circuits are used in many fields among which are current sensors and transformers. In applications such as current sensors, accuracy is closely related to the magnetic properties of the materials used and the precision of manufacturing. Achieving desired precision is often against the need reduce the manufacturing cost and reduce the size of the components.
  • the angle ⁇ of the cone can be very small and have, for example, a value tan ⁇ between 0.001 and 0.01. The difference in coil diameter between the ends is thus negligible.

Abstract

The magnetic circuit manufacture technique has a magnetic center section (3) inside an outer coil (2) formed by winding a conductor wire on a slightly conical shaped mandril. The magnetic center is spiral in shape with one end (16) shaped away from the mandril tube axis.

Description

La présente invention concerne un circuit magnétique bobiné et un procédé de fabrication d'un tel circuit.The present invention relates to a wound magnetic circuit and a method of manufacture of such a circuit.

Des circuits magnétiques bobinés sont utilisés dans de nombreux domaines parmi lesquels on compte les capteurs de courant et les transformateurs. Dans les applications telles que les capteurs de courant, la précision est étroitement liée aux propriétés magnétiques des matériaux utilisés et à la précision de fabrication. L'atteinte d'une précision voulue est souvent à l'encontre du besoin de réduire le coût de fabrication et de réduire la taille des composantes.Wound magnetic circuits are used in many fields among which are current sensors and transformers. In applications such as current sensors, accuracy is closely related to the magnetic properties of the materials used and the precision of manufacturing. Achieving desired precision is often against the need reduce the manufacturing cost and reduce the size of the components.

Un procédé de fabrication d'un bobinage sur un circuit magnétique torique est décrit dans le brevet européen EP 668 596. Le procédé décrit dans ce brevet, qui tente de répondre aux critères mentionnés ci-dessus, comprend les étapes d'enrouler un fil conducteur enduit d'un thermo-adhérent autour d'un mandrin cylindrique pour former une bobine, d'ouvrir un circuit magnétique en écartant les lèvres de l'entrefer, d'enfiler la bobine sur le circuit magnétique et ensuite de fermer le circuit magnétique.A method of manufacturing a winding on a toroidal magnetic circuit is described in European patent EP 668 596. The process described in this patent, who tries to meet the criteria mentioned above, understands the steps to wind a conductive wire coated with a thermo-adhesive around a mandrel cylindrical to form a coil, to open a magnetic circuit by spreading the lips of the air gap, thread the coil onto the magnetic circuit and then close the magnetic circuit.

Il y a plusieurs inconvénients à ce procédé conventionnel. Premièrement, il est très difficile d'enlever la bobine du mandrin cylindrique et ensuite de l'enfiler sur le noyau. Deuxièmement, l'ouverture et la refermeture du circuit magnétique, comme toute déformation plastique, détériore les propriétés magnétiques du circuit.There are several drawbacks to this conventional process. First, it is very difficult to remove the spool from the cylindrical mandrel and then thread it onto the core. Second, the opening and closing of the magnetic circuit, like all plastic deformation, deteriorates the magnetic properties of circuit.

Au vu de ces inconvénients, le but de la présente invention est de réaliser un circuit magnétique bobiné ayant un comportement électrique et magnétique précis et qui peut être fabriqué industriellement de façon économique. In view of these drawbacks, the object of the present invention is to provide a wound magnetic circuit having electrical and magnetic behavior precise and can be manufactured industrially economically.

Des buts de l'invention sont réalisés par le procédé de fabrication d'un circuit magnétique bobiné selon la revendication 1, le circuit magnétique bobiné de la revendication 5, et le dispositif pour la fabrication d'un circuit magnétique bobiné de la revendication 8.Objects of the invention are achieved by the method of manufacturing a circuit magnetic winding according to claim 1, the magnetic winding circuit of the claim 5, and the device for manufacturing a magnetic circuit The wound wire of claim 8.

Dans la présente invention, un procédé de fabrication d'un circuit magnétique bobiné ayant une bobine électrique et un noyau magnétique comporte les étapes de réaliser la bobine en bobinant un fil conducteur sur un mandrin ayant une surface extérieure légèrement conique, et d'enfiler la bobine sur un noyau magnétique en forme de spire ouverte, cette spire étant d'abord formée avant l'établissement des propriétés magnétiques spécifiées du matériau magnétique de la spire. Après l'enfilement de la bobine sur le noyau magnétique, on déforme les extrémités du noyau dans une direction essentiellement orthogonale au plan du circuit magnétique pour les rapprocher. Avantageusement, par ce procédé on déforme le matériel magnétique au minimum pour ne pas dégrader ces propriétés magnétiques.In the present invention, a method of manufacturing a magnetic circuit wound with an electric coil and a magnetic core with the stages of making the coil by winding a conducting wire on a mandrel having a slightly conical outer surface, and thread the spool on a core magnetic in the form of an open coil, this coil being first formed before establishing the specified magnetic properties of the magnetic material of the turn. After the coil has been threaded onto the magnetic core, we distorts the ends of the core in a direction essentially orthogonal to the plane of the magnetic circuit to bring them closer. Advantageously, by this process, the magnetic material is deformed minimum so as not to degrade these magnetic properties.

La bobine peut être enfilée sur le noyau magnétique pendant l'enlèvement du mandrin, ce qui réduit le temps et les coûts de fabrication du circuit magnétique bobiné. A cet effet, il est avantageux qu'une extrémité du noyau magnétique est insérée dans une cavité à une extrémité du mandrin pour faciliter l'enfilement de la bobine sur le noyau magnétique.The coil can be threaded onto the magnetic core during removal of the mandrel, which reduces the time and costs of manufacturing the magnetic circuit coil. For this purpose, it is advantageous that one end of the magnetic core is inserted into a cavity at one end of the mandrel to facilitate threading the coil on the magnetic core.

Le circuit magnétique bobiné peut en outre comporter un flasque et un connecteur, le flasque et le connecteur étant disposés, chacun, à une extrémité respective de la bobine, la bobine étant montée sur le noyau magnétique formé d'un fil magnétique de forme torique. Le flasque facilite l'enfilement de la bobine sur le noyau par sa forme et ses dimensions, d'une part, et par la réduction du coefficient de frottement, d'autre part. A cet effet, le flasque peut avantageusement avoir une surface intérieure chanfreinée pour faciliter son suivi de la courbure du noyau. Le flasque permet aussi d'éviter l'endommagement de l'isolant du fil électrique par frottement sur le tore.The wound magnetic circuit may further include a flange and a connector, the flange and the connector being each arranged at one end respective of the coil, the coil being mounted on the magnetic core formed a toroidal magnetic wire. The flange facilitates threading of the spool on the nucleus by its shape and its dimensions, on the one hand, and by the reduction of the coefficient of friction, on the other hand. For this purpose, the flange can advantageously have a chamfered interior surface to facilitate its followed by the curvature of the nucleus. The flange also avoids damage to the insulation of the electric wire by friction on the toroid.

Le mandrin du dispositif pour la fabrication d'un circuit magnétique bobiné, autour duquel la bobine est formée, peut avoir une surface extérieure de forme légèrement conique. Ceci facilite l'enlèvement de la bobine du mandrin.The mandrel of the device for manufacturing a wound magnetic circuit, around which the coil is formed, may have an outer surface of shape slightly conical. This facilitates removal of the spool from the mandrel.

L'angle α du cône peut être très faible et avoir, par exemple, une valeur tan α se situant entre 0,001 et 0,01. La différence de diamètre de la bobine entre les extrémités est ainsi négligeable.The angle α of the cone can be very small and have, for example, a value tan α between 0.001 and 0.01. The difference in coil diameter between the ends is thus negligible.

Le mandrin peut en outre comporter une cavité à son extrémité pour permettre l'insertion de l'extrémité du noyau magnétique dans la cavité, et ainsi faciliter l'assemblage de ces composantes.The mandrel can also have a cavity at its end to allow the insertion of the end of the magnetic core into the cavity, and thus facilitate the assembly of these components.

D'autres buts et aspects avantageux de l'invention ressortiront de la description et des revendications ci-après, et des dessins annexés, dans lesquels

  • la Fig. 1 est une vue en perspective d'un mandrin et d'une bobine formée sur le mandrin et prête à être insérée sur un noyau magnétique, selon l'invention;
  • la Fig. 2 est une coupe longitudinale de l'ensemble montré à la Fig. 1;
  • la Fig. 3 est une vue d'un fil magnétique continu utilisé pour former le noyau magnétique;
  • la Fig. 4 est une vue d'un noyau magnétique découpé du fil magnétique continu; et
  • les Figures 5 à 7 sont des vues en perspective montrant divers étapes dans la fabrication de la bobine.
    • Other objects and advantageous aspects of the invention will emerge from the description and claims below, and from the appended drawings, in which
  • Fig. 1 is a perspective view of a mandrel and a coil formed on the mandrel and ready to be inserted on a magnetic core, according to the invention;
  • Fig. 2 is a longitudinal section of the assembly shown in FIG. 1;
  • Fig. 3 is a view of a continuous magnetic wire used to form the magnetic core;
  • Fig. 4 is a view of a magnetic core cut from the continuous magnetic wire; and
  • Figures 5 to 7 are perspective views showing various stages in the manufacture of the coil.

    • Un circuit magnétique bobiné 1 comporte une bobine 2 et un noyau magnétique 3. La bobine 2 comporte un flasque 4 à une extrémité antérieure 19, un connecteur 5 à l'autre extrémité (10), et un fil conducteur 6 enroulé autour d'une cavité centrale 7 et s'étendant entre le connecteur 5 et le flasque 4. Le fil conducteur 6 peut être, par exemple, un fil de cuivre conventionnel muni d'une couche isolante et adhérente pour former la bobine. Le fil peut aussi être seulement isolant, l'application d'un adhérent se faisant pendant la formation de la bobine.A wound magnetic circuit 1 comprises a coil 2 and a core magnetic 3. The coil 2 has a flange 4 at an anterior end 19, a connector 5 at the other end (10), and a coiled conductive wire 6 around a central cavity 7 and extending between the connector 5 and the flange 4. The conducting wire 6 can be, for example, a conventional copper wire provided with an insulating and adherent layer to form the coil. The wire can also be only insulating, the application of an adherent being done during the reel formation.

    Le connecteur 5 comporte des bornes 8 pour la connexion du circuit magnétique bobiné à une électronique ou à un autre dispositif. Les bornes 8 sont logées dans un boítier 9 du connecteur qui sert aussi de support pour une extrémité 10 de la bobine et de l'extrémité des fils conducteurs de la bobine qui sont connectés électriquement aux bornes 8. La connexion des fils conducteurs à un dispositif extérieur est donc facilitée par l'intégration du connecteur 5 à la bobine pendant la fabrication de la bobine, et permet en même temps de protéger et d'assurer une bonne connexion entre les fils conducteurs de la bobine et une électronique extérieure.Connector 5 has terminals 8 for circuit connection magnetic wound to electronics or other device. Terminals 8 are housed in a housing 9 of the connector which also serves as a support for a end 10 of the coil and the end of the conductor wires of the coil which are electrically connected to terminals 8. The connection of the conductive wires to an external device is therefore made easier by integrating the connector 5 into the coil during the manufacture of the coil, and at the same time allows protect and ensure a good connection between the conductors of the coil and external electronics.

    Le flasque 4, à l'autre extrémité de la bobine 2, sert de support pour l'extrémité d'insertion de la bobine et offre une surface intérieure de guidage 11 pour protéger le fil à l'extrémité d'enfilement de la bobine contre une abrasion lors de l'enfilement sur le noyau 3 qui peut entraíner des courts-circuits entre spires. En outre, le guidage de l'extrémité de la bobine par le flasque 4 lors de la déformation de la bobine pendant son enfilement sur le noyau torique, est nettement améliorée. En effet, le flasque 4 permet de bien définir la forme et les dimensions de la surface de guidage 11 et de réduire le coefficient de frottement entre la bobine et le noyau magnétique 3. En particulier, le flasque comporte un chanfrein 18 pour suivre la courbure du noyau magnétique 3.The flange 4, at the other end of the coil 2, serves as a support for the end reel insertion and provides an inner guide surface 11 for protect the wire at the threading end of the spool against abrasion during threading on the core 3 which can cause short circuits between turns. In addition, the guidance of the end of the coil by the flange 4 during the deformation of the coil during its threading on the O-ring, is markedly improved. Indeed, the flange 4 makes it possible to define the shape well and the dimensions of the guide surface 11 and reduce the coefficient of friction between the coil and the magnetic core 3. In particular, the flange has a chamfer 18 to follow the curvature of the magnetic core 3.

    Après l'enfilement du connecteur 8 et du flasque 4 sur un mandrin 12, tel que montré dans la Fig. 5, une extrémité du fil conducteur est connectée à une borne 8a du connecteur et la bobine 2 est ensuite enroulée sur le mandrin 12 tel que montré à la Fig. 6. A la fin du bobinage, l'autre extrémité du fil conducteur est connecté à une des bornes 8b. La connexion entre le fil et les bornes 8a, 8b, peut se faire par connexion enroulée ou par d'autres moyens conventionnels. La bobine peut comporter un ou plusieurs enroulements supplémentaires connectés à une ou plusieurs bornes supplémentaires, telles que 8c.After the connector 8 and the flange 4 have been threaded onto a mandrel 12, such as shown in Fig. 5, one end of the conductive wire is connected to a connector terminal 8a and the coil 2 is then wound on the mandrel 12 as shown in Fig. 6. At the end of the winding, the other end of the wire conductor is connected to one of terminals 8b. The connection between the wire and the terminals 8a, 8b, can be done by coiled connection or by other means conventional. The coil can have one or more windings additional connected to one or more additional terminals, such than 8c.

    Le mandrin 12 s'étend le long d'un axe de rotation A jusqu'à une extrémité 13. Le mandrin a une surface extérieure conique 14 pour faciliter l'enlèvement de la bobine du mandrin et son enfilement sur le noyau magnétique 3. L'angle α du cône peut être très faible, par exemple tan a peut avoir une valeur entre 0,001 et 0,01, pour que l'influence du cône sur la variation de diamètre de la bobine soit négligeable tout en gardant l'avantage de faciliter l'enlèvement de la bobine du mandrin. Il est à noter que cet avantage est d'autant plus important que les fils sont enduits d'un produit adhérent pour le maintien de la forme de la bobine.The mandrel 12 extends along an axis of rotation A to an end 13. The mandrel has a conical outer surface 14 to facilitate removal of the reel of the mandrel and its threading on the magnetic core 3. The angle α of the cone can be very small, for example tan a can have a value between 0.001 and 0.01, so that the influence of the cone on the variation in diameter of the coil is negligible while retaining the advantage of facilitating the removal of the coil of the mandrel. It should be noted that this advantage is all the more important as the wires are coated with an adhesive product to maintain the shape of the coil.

    Le mandrin comporte une partie de positionnement 17 pour positionner et bloquer la rotation relative du connecteur 5 sur le mandrin. Le mandrin comporte en outre un creux 15 à son extrémité pour l'insertion d'une extrémité 16 du noyau magnétique 3 pendant l'étape d'enfilement de la bobine 2 sur le noyau, tel que montré aux figures 1, 2 et 7. Après la formation de la bobine sur le mandrin 12, la bobine 2 peut donc être facilement et directement enfilée sur le noyau magnétique 3, tel que montré à la Fig. 7, par l'action d'un poussoir 20 engageant l'extrémité connectrice 5 (voir la Fig. 1). Le poussoir a la forme d'une fourchette qui est placée à cheval sur le connecteur derrière des rebords 21 du connecteur après l'opération de bobinage. Le poussoir se déplace, dans la direction (P) parallèlement à l'axe (A) du mandrin, de manière à positionner la bobine 2 de façon précise sur le noyau magnétique 3. Dans le cas de l'utilisation d'un fil muni d'une couche thermo-adhérente, la bobine peut être chauffée, ou maintenue chaude, pour permettre sa déformation pendant l'enfilement sur le noyau 3.The mandrel has a positioning part 17 for positioning and block the relative rotation of connector 5 on the mandrel. The chuck further includes a recess 15 at its end for the insertion of one end 16 of the magnetic core 3 during the step of threading the coil 2 onto the core, as shown in Figures 1, 2 and 7. After forming the coil on the mandrel 12, the coil 2 can therefore be easily and directly threaded onto the magnetic core 3, as shown in FIG. 7, by the action of a pusher 20 engaging the connecting end 5 (see Fig. 1). The pusher has the shape of a fork which is placed astride the connector behind flanges 21 of the connector after the winding operation. The pusher moves, in the direction (P) parallel to the axis (A) of the mandrel, so as to position the coil 2 precisely on the magnetic core 3. In the case of the use of a wire provided with a thermo-adhesive layer, the coil can be heated, or kept hot, to allow its deformation during threading on the core 3.

    Le noyau torique 3 est constitué d'un matériau magnétiquement perméable conventionnel, tel que du fer-nickel et il peut avoir toute forme appropriée (fil, méplat, tôle, ou assemblage de tels éléments). Typiquement, pour avoir de bonnes propriétés magnétiques, le matériau utilisé est recuit après sa déformation en forme de tore ouvert, car les déformations plastiques importantes dégradent les propriétés magnétiques. Il n'est par contre plus possible de recuire le tore une fois que la bobine est montée dessus.The O-ring 3 is made of a magnetically permeable material conventional, such as iron-nickel and it can have any suitable form (wire, flat, sheet metal, or assembly of such elements). Typically, to have good magnetic properties, the material used is annealed after its deformation in the form of an open torus, because plastic deformations important degrades the magnetic properties. However, it is no longer possible to anneal the torus once the coil is mounted on it.

    Dans la présente invention, les déformations plastiques du matériel magnétique sont réduites au minimum pour diminuer l'influence de déformations sur les propriétés magnétiques. A cet effet, le matériau magnétique a, par exemple, la forme d'un fil 3' mis en forme de spire hélicoïdale, tel que montré à la Fig. 3, et ensuite découpé selon les lignes pointillées e1 et e2. On forme ainsi plusieurs spires individuelles, telles que montrées à la Fig. 4, les spires étant prêtes au montage de la bobine, tel que décrit ci-dessus, la seule déformation plastique des spires individuelles étant effectuée après le montage de la bobine pour rapprocher les extrémités 16, 16' du noyau magnétique 3. Les extrémités 16, 16' sont déformées par rotation dans une direction essentiellement orthogonale (O) au plan du circuit magnétique et forment un entrefer d'une longueur spécifiée, dépendant de l'application. In the present invention, the plastic deformations of the magnetic material are reduced to a minimum to reduce the influence of deformations on the magnetic properties. For this purpose, the magnetic material has, for example, the shape of a wire 3 'in the form of a helical turn, as shown in FIG. 3, and then cut along the dotted lines e1 and e2. We thus form several individual turns, as shown in Fig. 4, the turns being ready for assembly of the coil, as described above, the only plastic deformation individual turns being carried out after the assembly of the coil for bring the ends 16, 16 'closer to the magnetic core 3. The ends 16, 16 'are deformed by rotation in an essentially orthogonal direction (O) on the plane of the magnetic circuit and form an air gap of a length specified, depending on the application.

    Pendant la formation de la spire hélicoïdale, le pas (P) peut être ajusté pour correspondre à l'écartement nécessaire, dans la direction orthogonale (O) au plan du circuit, entre les extrémités 16, 16' de façon à permettre l'insertion de la bobine sur le noyau. L'épaisseur (E) de la découpe longitudinale de la spire pour former les spires individuelles peut être ajustée de sorte à ce que, après la déformation en rotation des extrémités 16, 16' du circuit magnétique dans la direction essentiellement orthogonale (O) au plan du circuit, les extrémités sont séparées par la longueur d'entrefer spécifiée. Dans ce cas, l'épaisseur (E) de la découpe est sensiblement égale à la longueur de l'entrefer.During the formation of the helical turn, the pitch (P) can be adjusted to correspond to the necessary spacing, in the orthogonal direction (O) to circuit plane, between the ends 16, 16 'so as to allow the insertion of the coil on the core. The thickness (E) of the longitudinal cut of the coil to form the individual turns can be adjusted so that after the rotational deformation of the ends 16, 16 'of the magnetic circuit in the direction essentially orthogonal (O) to the circuit plane, the ends are separated by the specified gap length. In this case, the thickness (E) of the cutout is substantially equal to the length of the air gap.

    Le matériel magnétique peut donc être recuit après la formation de la spire, ou après découpe des spires individuelles, de sorte que la seule déformation que subit le noyau magnétique après être recuit, est due au rapprochement des extrémités 16, 16' du circuit magnétique.The magnetic material can therefore be annealed after the formation of the coil, or after cutting the individual turns, so that the only deformation that undergoes the magnetic core after being annealed, is due to the approximation of ends 16, 16 'of the magnetic circuit.

    Claims (12)

    Procédé de fabrication d'un circuit magnétique bobiné (1) ayant une bobine électrique (2) et un noyau magnétique (3) comportant les étapes de réaliser la bobine (2) en bobinant un fil conducteur (6) sur un mandrin (12) ayant une surface extérieure légèrement conique (14), d'enfiler la bobine (2) sur un noyau magnétique (3) en forme de spire ouverte ayant des extrémités (16, 16'), cette spire étant d'abord formée avant l'établissement des propriétés magnétiques spécifiées du matériau magnétique de la spire, et de déformer les extrémités (16, 16') du noyau magnétique dans une direction essentiellement orthogonale (O) au plan du circuit magnétique bobiné pour les rapprocher.Method of manufacturing a wound magnetic circuit (1) having a electric coil (2) and a magnetic core (3) comprising the steps of make the coil (2) by winding a conductive wire (6) on a mandrel (12) having a slightly conical outer surface (14), threading the spool (2) on a magnetic core (3) in the form of an open coil having ends (16, 16 '), this turn being first formed before the establishment of the properties specified magnetic material of the coil, and to deform the ends (16, 16 ') of the magnetic core in a direction essentially orthogonal (O) to the plane of the wound magnetic circuit to bring them closer. Procédé selon la revendication 1, caractérisé en ce que la bobine (2) est enfilée sur le noyau magnétique (3) pendant l'enlèvement du mandrin (12).Method according to claim 1, characterized in that the coil (2) is threaded onto the magnetic core (3) during removal of the mandrel (12). Procédé selon la revendication 2, caractérisé en ce qu'une extrémité (16) du noyau magnétique (3) est insérée dans une cavité (15) à une extrémité (13) du mandrin (12) pour faciliter l'enfilement de la bobine (2) sur le noyau magnétique (3).Method according to claim 2, characterized in that one end (16) of the magnetic core (3) is inserted into a cavity (15) at one end (13) of the mandrel (12) to facilitate threading of the coil (2) on the core magnetic (3). Procédé selon une des revendications précédentes, caractérisé en ce que, avant ou pendant l'opération du bobinage, on dispose un flasque (4) sur le mandrin (12) pour former une extrémité antérieure (19) de la bobine (2), cette extrémité étant destinée à être enfilée en premier sur le noyau magnétique (3).Method according to one of the preceding claims, characterized in that, before or during the winding operation, there is a flange (4) on the mandrel (12) to form a front end (19) of the coil (2), this end being intended to be threaded first on the magnetic core (3). Circuit magnétique bobiné (1) comportant une bobine électrique (2) et un noyau magnétique (3), la bobine (2) comportant un fil conducteur (6), un flasque (4) et un connecteur (5), le flasque (4) et le connecteur (5) étant disposés, chacun, à une extrémité respective de la bobine (2), la bobine étant montée sur le noyau magnétique (3) formé d'un fil magnétique de forme torique.Coiled magnetic circuit (1) comprising an electric coil (2) and a magnetic core (3), the coil (2) comprising a conductive wire (6), a flange (4) and a connector (5), the flange (4) and the connector (5) being each arranged at a respective end of the coil (2), the coil being mounted on the magnetic core (3) formed of a shaped magnetic wire toric. Circuit magnétique bobiné selon la revendication précédente, caractérisé en ce que la cavité intérieure (7) de la bobine (2) a une forme légèrement conique.Coiled magnetic circuit according to the preceding claim, characterized in that the inner cavity (7) of the coil (2) has a slightly shaped conical. Circuit magnétique bobiné selon l'une des revendications 5 ou 6, caractérisé en ce qu'il est fabriqué par un des procédés selon l'une des revendications 1 à 4.Coiled magnetic circuit according to one of claims 5 or 6, characterized in that it is manufactured by one of the methods according to one of claims 1 to 4. Dispositif pour la fabrication d'un circuit magnétique bobiné comportant une bobine (2) monté sur un noyau magnétique (3) de forme torique, le dispositif comportant un mandrin (12) autour duquel la bobine est formée, le mandrin comportant une surface extérieure (14) de forme légèrement conique.Device for manufacturing a wound magnetic circuit comprising a coil (2) mounted on a magnetic core (3) of toroidal shape, the device comprising a mandrel (12) around which the coil is formed, the mandrel having an outer surface (14) of slightly conical shape. Dispositif selon la revendication précédente, caractérisé en ce que l'angle a du cône à une valeur tan α se situant entre 0, 001 et 0, 01.Device according to the preceding claim, characterized in that the angle a of the cone to a value tan α lying between 0.001 and 0.01. Dispositif selon la revendication 8 ou 9, caractérisé en ce que le mandrin (14) comporte une cavité (15) à son extrémité (13) pour permettre l'insertion de l'extrémité (16) du noyau magnétique (3) dans la cavité.Device according to claim 8 or 9, characterized in that the mandrel (14) has a cavity (15) at its end (13) to allow the insertion of the end (16) of the magnetic core (3) in the cavity. Dispositif selon l'une des revendications 8 à 10, caractérisé en ce qu'il comporte un poussoir (20) ayant une course suffisante pour pousser la bobine (2) hors du mandrin (12).Device according to one of claims 8 to 10, characterized in that it has a pusher (20) having sufficient travel to push the spool (2) out of the mandrel (12). Dispositif selon la revendication 12, caractérisé en ce que le poussoir (20) a la forme d'une fourchette.Device according to claim 12, characterized in that the pusher (20) has the shape of a fork.
    EP00810068A 1999-06-04 2000-01-25 Wound magnetic circuit Expired - Lifetime EP1058278B1 (en)

    Applications Claiming Priority (2)

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    CH105699 1999-06-04

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    JP3618638B2 (en) 2005-02-09
    US20040021540A1 (en) 2004-02-05
    EP1058278B1 (en) 2012-02-29
    JP2000348960A (en) 2000-12-15
    US6640419B2 (en) 2003-11-04
    US6987439B2 (en) 2006-01-17
    US20030115742A1 (en) 2003-06-26
    EP1058278A3 (en) 2000-12-13

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