EP0710966A2 - Noyau à deux pièces en matériau magnétique - Google Patents

Noyau à deux pièces en matériau magnétique Download PDF

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Publication number
EP0710966A2
EP0710966A2 EP95114512A EP95114512A EP0710966A2 EP 0710966 A2 EP0710966 A2 EP 0710966A2 EP 95114512 A EP95114512 A EP 95114512A EP 95114512 A EP95114512 A EP 95114512A EP 0710966 A2 EP0710966 A2 EP 0710966A2
Authority
EP
European Patent Office
Prior art keywords
core part
core
straight
coils
reflux
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95114512A
Other languages
German (de)
English (en)
Inventor
Johann Winkler
Erwin Dipl.-Ing.(Fh) Gaisbauer
Peter Witzlinger
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.)
Vogt Electronic AG
Original Assignee
Vogt Electronic AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vogt Electronic AG filed Critical Vogt Electronic AG
Publication of EP0710966A2 publication Critical patent/EP0710966A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/255—Magnetic cores made from particles
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating

Definitions

  • the invention relates to a two-part core according to the introductory part of patent claim 1.
  • Two-part cores of this type are known.
  • the plane of the free tub edge affects the straight core part, so that it has no distance from it and the coils pushed thereon accordingly protrude from the tub.
  • the coils of transformers, transformers, chokes and. The like are e.g. often potted to achieve high mechanical strength and good insulation.
  • the invention has for its object to design a two-part core according to the introductory part of claim 1 so that the casting of the coils is possible in a particularly simple manner and moreover eliminates the need to connect the two core parts together in a separate operation.
  • a particularly compact, largely shielded structure of the unit consisting of core and coils is to be achieved.
  • the use of special casting cups and other coverings for holding the initially liquid casting compound is unnecessary due to the raised trough shape of the reflux core part, because the casting compound can simply be poured into the tub until the coils are covered, so that the casting process is very easy to carry out.
  • the whole tub filling solidified potting compound keeps the two parts of the core, which only need to be held against each other during casting, in the long run, so that the additional operation of gluing the two core parts, which would otherwise be necessary, can be omitted.
  • the reflux core part surrounds the coil arrangement located on the straight core part over its entire height, so that when the component formed with the two-part core according to the invention (transformer, choke, transformer and the like) is arranged on a circuit board above the PCB coil assembly is completely magnetically shielded up to this.
  • the core 1 according to Figures 1-5 is made of a magnetic material, e.g. bound magnetic metal powder or ferrite, and is composed of two identical halves 1 '. It has a straight, here cylindrical core part 2 for receiving the coil or coils and a reflux core part 3 for closing the magnetic circuit outside the coil or coils and the straight core part 2.
  • a magnetic material e.g. bound magnetic metal powder or ferrite
  • the reflux core part 3 has the shape of a trough in which the straight core part 2 is at a distance at least corresponding to the radial thickness d of the coil winding 4 from the wall of the reflux core part, i. H. extends from the tub floor 3a, the tub side walls 3b and the plane of the free tub rim 3c parallel to the tub floor, to the tub side walls and to the tub rim plane.
  • the trough can be used as a casting cup, in which the coil 4 or more, because of the side walls 3b and end walls 3d, which are raised beyond the straight core part 2 at least beyond the radial winding thickness of the coil (s) Immerse coils arranged next to each other over their full height on the straight core part 2.
  • the the Casting compound filling the cavity of the tub essentially up to the level of the free edge 3c also holds the core halves 1 'together permanently after solidification, so that separate gluing, which normally requires a separate operation in the case of other two-part cores, is unnecessary and no adhesive residues remain in the joints can.
  • the potting compound filling the tub cavity everywhere ensures, in conjunction with the use of the best possible heat-conducting material, e.g. Ferrite, for the core and with the greatest possible filling of the space between the straight core part 2 and the reflux core part 3 with copper also a low thermal resistance and thus good heat dissipation from the coil arrangement.
  • the best possible heat-conducting material e.g. Ferrite
  • FIG. 1 For the sake of clarity, only a single coil 4 made of thick wire and very flat is shown in FIG. 1.
  • several such thick wire coils 4 are usually arranged next to one another on the straight core part 2, as can be seen in FIG. 1 at the ends 4a of the thick wire coils which are led out downwards.
  • thin wire coils can also be pushed onto the straight core part 2.
  • the use of the flat bobbin 5 shown in Fig. 8 is recommended, which is adapted in its outer contour to the shape of the inner wall of the reflux core part 3 and carries the coil winding made of thin wire inserted into it.
  • coils made of thick wire or thin wire can also be arranged on the core part 2 over a larger longitudinal section of the straight core part 2 or over its entire length, but the availability of a few different flat individual coils for the winding structure gives extensive freedom in terms of design electrical properties of the structural unit consisting of core and coils in a very simple manner, and even with prefabricated, already cast structural units there is still considerable design freedom in this Consideration exists if, as can be seen from FIG. 1, the possibility of connecting the individual coils to one another outside the tub is set up.
  • the entire coil arrangement located in the reflux core part 3, encapsulated therein, is magnetically shielded sideways and upwards, as a result of which the scattering onto wire connections and adjacent components is minimized, and there is also a compact, mechanically very stable structure.
  • the ends 4a of the individual coils e.g. 4 can be connected to one another by conductor tracks on the circuit board or, in particular when the individual coils are connected in parallel, in an elongated hole in the circuit board.
  • a particularly good utilization of the space available for the wire cross-section between the straight core part 2 and the reflux core part 3 is obtained if open, bobbin-free thick wire coils 4 are used, which are used as single spiral coils or, better still as shown in FIGS. 6 and 7, as double spiral coils are executed.
  • bobbin-free thick wire coils 4 are used, which are used as single spiral coils or, better still as shown in FIGS. 6 and 7, as double spiral coils are executed.
  • For such a coil structure in particular from individual coils connected in parallel with one another, there is optimum efficiency without compensating currents and electromigration.
  • the use of thick wire with a square cross section is particularly favorable.
  • the reflux core part 3 is provided on the outside with at least one flat surface section. If, as in the embodiment described, two such surface sections are present on opposite sides and are arranged parallel to one another, the core can also be handled by means of a gripper.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
EP95114512A 1994-11-07 1995-09-15 Noyau à deux pièces en matériau magnétique Withdrawn EP0710966A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9417495U DE9417495U1 (de) 1994-11-07 1994-11-07 Zweiteiliger Kern aus magnetischem Material
DE9417495U 1994-11-07

Publications (1)

Publication Number Publication Date
EP0710966A2 true EP0710966A2 (fr) 1996-05-08

Family

ID=6915547

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95114512A Withdrawn EP0710966A2 (fr) 1994-11-07 1995-09-15 Noyau à deux pièces en matériau magnétique

Country Status (2)

Country Link
EP (1) EP0710966A2 (fr)
DE (1) DE9417495U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3316267A1 (fr) * 2016-10-28 2018-05-02 Höganäs AB (publ) Dispositif inductif et procédé de fabrication

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013101364B4 (de) * 2013-02-12 2023-02-02 Tdk Electronics Ag Elektrisches Übertragerbauelement
JP6365941B2 (ja) * 2014-11-07 2018-08-01 株式会社オートネットワーク技術研究所 リアクトル

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3316267A1 (fr) * 2016-10-28 2018-05-02 Höganäs AB (publ) Dispositif inductif et procédé de fabrication
WO2018078102A1 (fr) * 2016-10-28 2018-05-03 Höganäs Ab (Publ) Dispositif inductif et procédé de fabrication associé
CN109891528A (zh) * 2016-10-28 2019-06-14 霍加纳斯股份有限公司 电感装置及其制造方法

Also Published As

Publication number Publication date
DE9417495U1 (de) 1995-01-05

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