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WO1999038175A1 - Noyau de ferrite - Google Patents

Noyau de ferrite Download PDF

Info

Publication number
WO1999038175A1
WO1999038175A1 PCT/EP1998/008467 EP9808467W WO9938175A1 WO 1999038175 A1 WO1999038175 A1 WO 1999038175A1 EP 9808467 W EP9808467 W EP 9808467W WO 9938175 A1 WO9938175 A1 WO 9938175A1
Authority
WO
WIPO (PCT)
Prior art keywords
blocks
ferrite core
plates
outer surfaces
ferrite
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.)
Ceased
Application number
PCT/EP1998/008467
Other languages
German (de)
English (en)
Inventor
Frank Schirmeier
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.)
Wampfler AG
Original Assignee
Wampfler 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 Wampfler AG filed Critical Wampfler AG
Publication of WO1999038175A1 publication Critical patent/WO1999038175A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/08—Cores, Yokes, or armatures made from powder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits

Definitions

  • the innovation relates to a ferrite core according to the preamble of claim 1 and a method for its production according to the preamble of claim 6.
  • One-piece, large-volume sintered ceramic ferrite cores have a number of disadvantages. They are very expensive to manufacture, which is due in particular to the long sintering times and the controlled cooling of the blocks after sintering. Large ferrite cores are sensitive to shocks, sensitive to temperature fluctuations and tend to break. It is noteworthy here that the shrinkage during sintering is 15 to 20% and, moreover, is not always constant across the core cross section. A dimensional tolerance of +/- 2% must therefore be expected for the blanks. In the case of sensitivity to large temperature fluctuations, a linear expansion coefficient of 8.5 x 10 "6 / ° C must be expected.
  • Figure 1 is a perspective view of four blocks to be connected together.
  • Fig. 2 is a perspective view of the connection process
  • Fig. 3 is a perspective view of the finished ferrite core.
  • a flat ferrite core is to be produced from four blocks 1 of the same size made of sintered ceramic.
  • the blocks 1 each have a rectangular shape, cut horizontally and vertically. These blocks 1 are ground flat on their vertical narrow surfaces 2.
  • the blocks 1 are placed side by side so that the ground vertical narrow surfaces of adjacent blocks 1 touch each other.
  • Pressure is now exerted on the respective outer narrow surfaces 2 in a clamping device.
  • An adhesive which can be relatively viscous, is applied to the upper and lower outer narrow surfaces 3, 4.
  • plates 5, 6 are now applied with the application of pressure, whereby the outer surfaces 3, 4 are connected to one another.
  • a sandwich component is now created from the plates 5, 6, between which the blocks 1, 2 are held.
  • the plates 5, 6 can consist of hard paper or plastic.
  • the size of the plates 5, 6 is preferably equal to the size of the surfaces 3, 4 strung together.
  • the joints 7 between the mutually contacting surfaces 2 are extremely small and are practically determined by the surface roughness of these surfaces 2.
  • the plates 5, 6 act as edge protection for the upper and lower edges of the blocks 1. Since the plates 5, 6 act as reinforcement, the ferrite core is much more stable than a one-piece ferrite core. If a block 1 is damaged, the sandwich ferrite core can be dismantled and the damaged block can be replaced by another.
  • the opposing narrow outer surfaces 3, 4 of the blocks 1 were glued to one another via the plates 5, 6.
  • the vertical wide outer surfaces 8, 9 of the blocks 1 can also be glued to one another by means of correspondingly large plates. It is also possible to glue outer surfaces of the blocks 1 running at right angles to one another, for example the outer surfaces 4 and the outer surfaces 8, in each case. If necessary, an L-shaped plate can be used for this. The latter embodiment variant can be used in particular where the blocks 1 do not have a uniform height, such as the block 1A in FIG. 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Soft Magnetic Materials (AREA)
  • Magnetic Heads (AREA)

Abstract

L'invention concerne un noyau de ferrite et un procédé pour la fabrication d'un noyau de ferrite composé de blocs individuels (1), lesdits blocs étant collés mutuellement, sur deux surfaces extérieures opposées (3, 4), au moyen de plaques (5, 6) recouvrant les joints entre les blocs (1). De tels noyaux de ferrite sont chers à produire et présentent des caractéristiques électromagnétiques médiocres en raison des entrefers entre les différents blocs. L'invention a pour objet de créer un noyau de ferrite constitué de différents blocs pouvant être produits à faible coût. A cet effet, les surfaces se touchant (2) de blocs adjacents (1) sont planes. D'autre part, une pression est exercée, dans un dispositif de serrage, sur les surfaces étroites extérieures (2) respectives, et ensuite les blocs (1) sont collés avec les plaques (5, 6).
PCT/EP1998/008467 1998-01-23 1998-12-28 Noyau de ferrite Ceased WO1999038175A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29801073.9 1998-01-23
DE29801073U DE29801073U1 (de) 1998-01-23 1998-01-23 Ferritkern

Publications (1)

Publication Number Publication Date
WO1999038175A1 true WO1999038175A1 (fr) 1999-07-29

Family

ID=8051622

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/008467 Ceased WO1999038175A1 (fr) 1998-01-23 1998-12-28 Noyau de ferrite

Country Status (2)

Country Link
DE (1) DE29801073U1 (fr)
WO (1) WO1999038175A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001010501A1 (fr) * 1999-08-07 2001-02-15 Mfh Hyperthermiesysteme Gmbh Applicateur de champ magnetique pour le chauffage de substances ou de corps solides magnetiques ou magnetisables dans des tissus biologiques

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVI20110109A1 (it) * 2011-04-29 2012-10-30 Diego Ghiotto Nucleo magnetico idoneo a realizzare geometrie di nuclei sviluppati nelle tre dimensioni.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1098632B (de) * 1958-03-12 1961-02-02 Heinz Schackert Verfahren zur Herstellung starrer, ebener Dauermagnetplatten groesseren Ausmasses
US3710291A (en) * 1970-11-18 1973-01-09 Sermag Permanent magnet
US4007541A (en) * 1975-04-14 1977-02-15 Ampex Corporation Method for fabricating a dielectric filled ferrite toroid for use in microwave devices
GB1514161A (en) * 1975-05-21 1978-06-14 Doyle A Inductor device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958019A (en) * 1956-09-17 1960-10-25 Indiana General Corp Magnetic pad assembly
FR1353490A (fr) * 1962-10-24 1964-02-28 Plateau magnétique et son procédé de fabrication
DE1614579C3 (de) * 1967-08-09 1978-09-07 Heinrich Dr.-Ing. 4714 Selm Spodig Dauermagnetisches Haftsystem
DE2609720A1 (de) * 1975-03-10 1976-09-23 Monomelt Co Magnetische haltevorrichtung
DE2835441A1 (de) * 1978-08-12 1980-02-28 Vacuumschmelze Gmbh Verfahren zum herstellen eines aus ebenen segmenten aufgebauten schalenmagneten

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1098632B (de) * 1958-03-12 1961-02-02 Heinz Schackert Verfahren zur Herstellung starrer, ebener Dauermagnetplatten groesseren Ausmasses
US3710291A (en) * 1970-11-18 1973-01-09 Sermag Permanent magnet
US4007541A (en) * 1975-04-14 1977-02-15 Ampex Corporation Method for fabricating a dielectric filled ferrite toroid for use in microwave devices
GB1514161A (en) * 1975-05-21 1978-06-14 Doyle A Inductor device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001010501A1 (fr) * 1999-08-07 2001-02-15 Mfh Hyperthermiesysteme Gmbh Applicateur de champ magnetique pour le chauffage de substances ou de corps solides magnetiques ou magnetisables dans des tissus biologiques
US6635009B2 (en) 1999-08-07 2003-10-21 Mfh Hyperthermiesysteme Gmbh Magnetic field applicator for heating magnetic substances in biological tissue

Also Published As

Publication number Publication date
DE29801073U1 (de) 1998-08-06

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