EP0065910B1 - Magnetischer Kreis, Drossel mit derartigem magnetischem Kreis und Verfahren zur Herstellung von Drosseln - Google Patents

Magnetischer Kreis, Drossel mit derartigem magnetischem Kreis und Verfahren zur Herstellung von Drosseln Download PDF

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Publication number
EP0065910B1
EP0065910B1 EP82400879A EP82400879A EP0065910B1 EP 0065910 B1 EP0065910 B1 EP 0065910B1 EP 82400879 A EP82400879 A EP 82400879A EP 82400879 A EP82400879 A EP 82400879A EP 0065910 B1 EP0065910 B1 EP 0065910B1
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EP
European Patent Office
Prior art keywords
magnetic circuit
grooves
magnetic
groove
branches
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.)
Expired
Application number
EP82400879A
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English (en)
French (fr)
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EP0065910A1 (de
Inventor
René Sibille
Pierre Gaudry
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Lcc-Cice - Europeenne De Composan Cie
Original Assignee
Lcc-Cice - Europeenne De Composants Electroniques Cie
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Publication of EP0065910A1 publication Critical patent/EP0065910A1/de
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Publication of EP0065910B1 publication Critical patent/EP0065910B1/de
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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
    • H01F17/045—Fixed inductances of the signal type  with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
    • 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
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F2027/348—Preventing eddy currents

Definitions

  • the present invention relates to a magnetic circuit for inductor according to the preamble of claim 1. It also relates to an inductor using such a magnetic circuit as well as a method of manufacturing said magnetic circuit for the production of said inductors.
  • Inductors in particular miniature inductors for high frequencies, are most generally obtained by winding an enameled copper wire, in the groove of a magnetic pulley made of ferrite or iron powder.
  • This pulley is generally obtained either by injection or molding of magnetic powder mixed with a thermo-plastic or thermosetting material, or by size, from a cylindrical bar using a diamond wheel. In the latter case, a certain number of grooves can be machined successively or simultaneously on the same cylindrical bar. There is thus obtained a plurality of grooves regularly distributed over this bar, grooves in which the copper wire is wound. This winding operation can be carried out on all of the pulleys constituting the bar, then each individual pulley is obtained by cutting up said bar.
  • the magnetic circuit according to the invention makes it possible to avoid these drawbacks.
  • the width of the upper groove is smaller than that of the lower groove, in that insulating means are arranged on each lower branch of the magnetic circuit and in that said insulating means separate said lower branches of said electrical connection means, so as to favor as much as possible the passage of the magnetic flux in the air gap defined by the upper branches.
  • the upper groove which is narrower than the lower groove, makes it possible to limit eddy currents in the lower metal parts as much as possible and to encourage the passage of magnetic flux in the upper air gap as much as possible, which corresponds to the part of the circuit having the most low reluctance. This effect is further improved when the branches surrounding the lower throat are longer than the branches surrounding the upper throat.
  • the electrical connection means as defined above can be produced according to different variants: they can be constituted for example by metallic deposits, metallic tabs adapted to the printed circuit, these being glued to the magnetic core via an insulating part.
  • the invention also relates to magnetic inductors comprising a magnetic circuit as defined above, said magnetic circuit being provided with a suitable winding. The ends of this winding will be electrically connected to the electrical connection means.
  • grooves or grooves can be carried out by pressing or by horizontal, sequential or simultaneous grooving, by any suitable means well known to those skilled in the art.
  • the grooving will be carried out parallel to the lateral plane of the parallelepiped bar, making it possible to obtain, after separation, magnetic circuits having an H shape in a plane perpendicular to the lateral plane of the bar.
  • FIG. 1 represents a magnetic circuit according to the invention.
  • This magnetic circuit is obtained, as will be seen below, from a parallelepiped bar having a rectangular lateral face 2 and which has been subjected to a grooving operation after which a plurality of upper grooves such as 7 and lower grooves such as 6 have been made. These grooves are separated by a solid part 8. The non-grooved parts of the front face of the parallelepiped are then cut parallel to the face 2 to form magnetic circuits.
  • the groove 7 has two vertical walls 21 and 23 and a horizontal wall 22 which limit the central part 8 of the magnetic circuit.
  • the lower groove 6 has walls arranged in the same way as that of the groove 7.
  • the upper groove 7 is surrounded by two upper branches 17 and 18 while the lower groove 6 is surrounded by two lower branches 15 and 3. Under each of these lower branches, connection means 19 and 20 are shown.
  • the coil 24 made up of several turns wound inside the grooves 6 and 7, the ends 25 and 26 of said coil being respectively connected to the connection means 20 and 19.
  • the width a of the groove upper 7 is very inferior. smaller than the width b of the lower groove 6.
  • the ratio between the width b between the lower legs and the width a between the upper legs will be between 1.5 and 3.
  • the ratio between the height of the lower legs d and the height of the upper legs c will be between 1.5 and 2 and preferably of the order of 2.
  • inductor as seen in section in Figure 1, inductor having electrical connection means particularly suitable for fixing it on hybrid circuit supports.
  • the ends of the winding, such as 25 are respectively connected to metallized tapes such as 28 and 29, the connection being made in the extension of the axis of the groove 7.
  • the electrical connection between the end 25 and the metallized tape 28 is therefore located substantially in the middle of it.
  • the magnetic circuit is fixed on an insulating support such as 30 using a suitable adhesive such as a polyurethane epoxy adhesive, etc., this insulating support comprising metallized tapes 28 and 29.
  • the lateral rectangular face 16 of the magnetic circuit is arranged in the extension of the lateral face of the insulating support 30.
  • FIG. 3 a another alternative embodiment is shown of the electrical connection means fixed to the lower legs of the magnetic circuit.
  • these electrical connections 19 and 20 are made by metallic deposition such as a silver paste.
  • the ends 25 and 26 of the winding are then electrically welded on the connections 19 and 20 previously tinned, as shown in FIG. 3b which is a section along the axis BB of the magnetic circuit shown in FIG. 3a.
  • FIG. 4 represents another alternative embodiment of the circuit shown in FIG. 2, the only difference being the presence of two radial outputs 31 and 32 for the printed circuit, outputs connected respectively to the electrical connection means 28 and 29.
  • FIG. 5 represents the different stages of the method according to the invention.
  • a parallelepiped magnetic bar 40 and a metallized substrate 41 (FIG. 5a) which are assembled along their surfaces of common dimensions (FIG. 5b) using, for example, a layer of adhesive 42.
  • the metallized substrate 41 has on its lower face a groove 45 extending over its entire length, in parallel with a long side of the substrate 41.
  • the assembly is then grooved as explained above to form sets of grooves which are parallel to each other, upper grooves 43 and lower grooves 44 (FIG. 5c).
  • the inductances are then wound using a single enamelled copper wire 46 which is first introduced into the groove 45 then welded therein (FIG. 5d) and wound in the grooves 43 and 44 according to the number of turns requested, etc ... (we can proceed to the sequential or simultaneous welding of the wire 46 in the groove 45).
  • Figure 5e a succession of inductors which will be separated along the axes 47, 48, 49, 50, ... ( Figure 5d and 5e).

Claims (9)

1. Magnetkreis für eine Induktivität, welcher dazu bestimmt ist, von einer Wicklung umgeben zu werden, deren Enden an Mittel zum elektrischen Anschließen der genannten Induktivität angeschlossen sind, wobei der Magnetkreis quaderförmig ist und zwei Nuten aufweist, eine obere (7) und eine untere (6), welche im wesentlichen übereinander angeordnet sind und in welchen sich die Wicklung befindet, wobei der Kreis im wesentlichen die Form eines H in einer zu den Nuten (6, 7) senkrechten Ebene aufweist und so zwei obere Zweige (17, 18), welche die obere Nut (7) umgeben, und zwei untere Zweige (3, 15) bildet, welche die untere Nut (6) begrenzen, dadurch gekennzeichnet, daß die Breite der oberen Nut geringer ist als die der unteren Nut, so daß der Durchgang des Magnetflusses in dem durch die oberen Zweige (17, 18) gebildeten Eisenspalt maximal gefördert wird, und daß Isoliermittel unter jedem unteren Zweig (3, 15) des Magnetkreises angeordnet sind und die genannten Isoliermittel die genannten unteren Zweige (3, 15) von den genannten elektrischen Anschlußmitteln trennen.
2. Magnetkreis nach Anspruch 1, dadurch gekennzeichnet, daß das Verhältnis der Breiten der unteren Nut und oberen Nut zwischen 1,5 und 3 liegt.
3. Magnetkreis nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die unteren Zweige (3, 15) eine Länge aufweisen, die größer ist als die der oberen Zweige (17, 18).
4. Magnetkreis nach Anspruch 3, dadurch gekennzeichnet, daß das Verhältnis zwischen der Länge der unteren Zweige und oberen Zweige zwischen 1,5 und 2 beträgt.
5. Magnetkreis nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die elektrischen Anschlußmittel durch metallische Ablagerungen gebildet sind, welche die Basis jedes unteren Zweiges (3, 15) bedecken.
6. Magnetkreis nach Anspruch 5, dadurch gekennzeichnet, daß jede metallische Ablagerung eine mittlere Rille (45) aufweist, in welcher ein Ende der Wicklung eingelötet ist.
7. Magnetkreis nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die genannten Isoliermittel durch einen isolierenden Träger gebildet sind, wovon zwei einander gegenüberliegende Enden mit metallisierten Streifen (28, 29) versehen sind, die jeweils an die Enden der Wicklung angeschlossen sind.
8. Magnetische Induktivität, die einen Magnetkreis aufweist, welcher von einer Wicklung umgeben ist, deren Enden an Mittel zum elektrischen Anschließen angeschlossen sind, welche mit dem Magnetkreis fest verbunden sind, dadurch gekennzeichnet, daß der Magnetkreis gemäß einem der vorstehenden Ansprüche ausgebildet ist.
9. Verfahren zur Herstellung von einzelnen magnetischen Induktivitäten nach Anspruch 8, dadurch gekennzeichnet, daß :
- mittels eines Klebers ein quaderförmiger magnetischer Stab (40) und ein metallisiertes Substrat (41), welches eine sich über die gesamte Länge parallel zur Hauptseite des Substrats (41) erstreckende Rille (45) aufweist, zusammengebaut werden ;
- die so gebildete Baugruppe mit Rillen versehen wird, so daß obere Rillen (43) und untere Rillen (44) parallel zur kleinen Seite des Quaders gebildet werden ;
- anschließend mittels eines einzigen Metalldrahtes jede Wicklung in jede Gruppe von unteren und oberen Rillen (43, 44) eingebracht wird ;
- der Draht (46) in jede Rille (45) des Substrates (41) eingelötet wird ;
- die so gebildete Einheit in einzelne Induktivitäten aufgeteilt wird, und zwar zwischen zwei aufeinanderfolgenden unteren Rillen (44) und parallel zur seitlichen Ebene des Stabes (40), so daß Induktivitäten erhalten werden, deren Magnetkreis einen H-förmigen Querschnitt in einer zu den genannten Rillen (44) senkrechten Ebene aufweist.
EP82400879A 1981-05-19 1982-05-11 Magnetischer Kreis, Drossel mit derartigem magnetischem Kreis und Verfahren zur Herstellung von Drosseln Expired EP0065910B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8109939A FR2506504B1 (fr) 1981-05-19 1981-05-19 Circuit magnetique, inductance utilisant un tel circuit et procede de realisation dudit circuit magnetique
FR8109939 1981-05-19

Publications (2)

Publication Number Publication Date
EP0065910A1 EP0065910A1 (de) 1982-12-01
EP0065910B1 true EP0065910B1 (de) 1985-09-18

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EP82400879A Expired EP0065910B1 (de) 1981-05-19 1982-05-11 Magnetischer Kreis, Drossel mit derartigem magnetischem Kreis und Verfahren zur Herstellung von Drosseln

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US (1) US4455544A (de)
EP (1) EP0065910B1 (de)
DE (1) DE3266327D1 (de)
FR (1) FR2506504B1 (de)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2005024864A1 (en) * 2003-09-09 2005-03-17 Gallagher Group Limited Signal transfer device
CN105074840A (zh) * 2013-03-29 2015-11-18 皇家飞利浦有限公司 多电感性组件

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US4588974A (en) * 1984-08-15 1986-05-13 Standex International Corporation Coil assembly having clamped and bonded contacts
JPH0729612Y2 (ja) * 1988-06-23 1995-07-05 株式会社村田製作所 ノイズ除去用インダクタ
US5067917A (en) * 1989-09-06 1991-11-26 Eldec Corporation Component mounting frame
US8137619B2 (en) * 1997-08-11 2012-03-20 Ventana Medical Systems, Inc. Memory management method and apparatus for automated biological reaction system
DE19812836A1 (de) * 1998-03-24 1999-09-30 Pemetzrieder Neosid Induktives Miniatur-Bauelement für SMD-Montage
US6437676B1 (en) * 1999-06-29 2002-08-20 Matsushita Electric Industrial Co., Ltd. Inductance element
US8400154B1 (en) * 2008-02-08 2013-03-19 Seektech, Inc. Locator antenna with conductive bobbin

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US31238A (en) * 1861-01-29 hardy
CA768777A (en) * 1967-10-03 N.V. Philips Gloeilampenfabrieken Coil core consisting of ceramic ferromagnetic material
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005024864A1 (en) * 2003-09-09 2005-03-17 Gallagher Group Limited Signal transfer device
CN105074840A (zh) * 2013-03-29 2015-11-18 皇家飞利浦有限公司 多电感性组件

Also Published As

Publication number Publication date
US4455544A (en) 1984-06-19
FR2506504B1 (fr) 1985-10-11
DE3266327D1 (en) 1985-10-24
FR2506504A1 (fr) 1982-11-26
EP0065910A1 (de) 1982-12-01

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