EP0542200B1 - Utilisation d'un matériau magnétique pour noyaux de bobbine - Google Patents

Utilisation d'un matériau magnétique pour noyaux de bobbine Download PDF

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Publication number
EP0542200B1
EP0542200B1 EP92119218A EP92119218A EP0542200B1 EP 0542200 B1 EP0542200 B1 EP 0542200B1 EP 92119218 A EP92119218 A EP 92119218A EP 92119218 A EP92119218 A EP 92119218A EP 0542200 B1 EP0542200 B1 EP 0542200B1
Authority
EP
European Patent Office
Prior art keywords
ferrite
employed
use according
weight
epoxy resin
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 - Lifetime
Application number
EP92119218A
Other languages
German (de)
English (en)
Other versions
EP0542200A1 (fr
Inventor
Pavel Dr. Neusser
Mauricio Dipl.-Phys. Esquerra
Georg Ing. Grad. Stadler
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.)
TDK Electronics AG
Original Assignee
Siemens Matsushita Components GmbH and Co KG
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6444529&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0542200(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Siemens Matsushita Components GmbH and Co KG filed Critical Siemens Matsushita Components GmbH and Co KG
Priority to DE9218475U priority Critical patent/DE9218475U1/de
Publication of EP0542200A1 publication Critical patent/EP0542200A1/fr
Application granted granted Critical
Publication of EP0542200B1 publication Critical patent/EP0542200B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
    • H01F1/36—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles
    • H01F1/37—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles in a bonding agent

Definitions

  • the present invention relates to the use of a magnetic material for coil cores after the preamble of claim 1.
  • inductive components in the presence high external magnetic fields is the use of Coils as inductance in resonant circuits of inductive proximity switches, those in the automotive industry in welding machines be used.
  • High magnetic fields occur on which the permeability of the magnetic core cer coil in the inductive Reduce proximity switches so that their inductance and thus changes the quality of an oscillator whose frequency-determining circuit the coil as an inductive component contains. Therefore, there may be undesirable switching operations of the inductive Proximity switch come.
  • carbonyl iron In addition to the advantage of an almost constant permeability carbonyl iron still has high magnetic fields but the disadvantage of a relatively low initial permeability, which results in an application in inductive proximity switches result in correspondingly short switching distances. Furthermore, the production of carbonyl iron from chemical Relatively complex reasons, since pure iron chemically in a carbonyl compound must be included. Finally also results from mechanical reworking of coil cores made of carbonyl iron, for example by grinding, the disadvantage that the advantage of a high electrical resistance and associated low electrical losses is lost because the material is machined becomes electrically conductive.
  • the present invention has for its object a using a magnetic material for a coil core specify that with easy processability in the area of high Magnetic fields can be used and not only a constant permeability, but also a constant maintains high resistivity, resulting in low Core losses and thus a high quality of this core material containing coil are guaranteed.
  • the magnetic material used by a homogeneous Ferrite / plastic composition with a mixing ratio is formed, the maximum to be expected from the parameters External field strength and minimum permeability set has the advantage that next to one up to high Field strengths constant permeability due to the ferrite content maintain a high specific resistance at the same time remains, resulting in low core losses and thus high grades of coils containing this core material are guaranteed.
  • the magnetic material is made of a ferrite / plastic composition with a mixing ratio formed by the maximum expected external field strength and the minimum permissible Permeability is set. It is preferably is a composition of a nickel / zinc ferrite and an epoxy resin in a mixing ratio of 75 to 95 % By weight, preferably 83 to 88% by weight of ferrite and 5 to 25% by weight, preferably 12 to 17% by weight of epoxy resin.
  • other ferrites instead of nickel / zinc ferrite, e.g. B. a manganese / zinc ferrite and others instead of epoxy resin Plastics, e.g. B. other thermosets can be used.
  • the material used instead of sintering Hardening at relatively low temperatures to produce coil cores can also be processed, the result is Advantage that the shrinkage associated with sintering Cores are avoided, so that predetermined core dimensions easier can be met.
  • the nickel / zinc ferrite powder is used before mixing finely ground with epoxy resin, after which the mixture of this finely ground Powder for about 20 to 30 min by continuous
  • the epoxy resin is fed to the ferrite powder.
  • the processing The mixture to form granules that can be pressed can be made through Passlers sieves and dedusting take place.
  • the hardening of from the granulate pressed moldings take place at relatively low temperatures in the range of approximately 390 to 430 ° K.
  • curve 1 shows the initial permeability ⁇ i of a ferrite material with the designation K1
  • curve 2 shows the initial permeability for carbonyl iron
  • curve 3 shows the initial permeability of the magnetic material used in the form of a ferrite / plastic composition.
  • the corresponding curves 1 to 3 show the quality Q of the ring-wound shell cores made of the materials mentioned. The measurements according to curves 1 to 3 were each carried out for a frequency of 100 kHz.
  • a comparison of the curves according to FIGS. 1 and 2 shows that the quality Q for the magnetic material used is greater than that for carbonyl iron, although according to FIG. 1 the initial permeability ⁇ i for the magnetic material used is smaller than that for carbonyl iron.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Soft Magnetic Materials (AREA)

Claims (6)

  1. Utilisation d'un matériau magnétique cisaillé, ayant une perméabilité aussi constante que possible, comme noyau de bobines dans un composant inductif pour application dans le domaine des hauts champs étrangers magnétiques, caractérisée en ce qu'une combinaison homogène de ferrite / matière synthétique comportant une proportion de ferrite de 75 à 95 % en poids et une proportion de matière synthétique entre 25 et 5 % en poids est utilisée et en ce que la proportion de mélange est ajustée dans cette plage de sorte que, jusqu'à l'intensité de champ étranger à escompter au maximum, la perméabilité au minimum nécessaire, avec simultanément une résistance électrique aussi élevée que possible, est maintenue sensiblement constante pour parvenir à une qualité de bobines élevée.
  2. Utilisation selon la revendication 1, caractérisée en ce qu'un ferrite au nickel-zinc est utilisé comme matériau de ferrite.
  3. Utilisation selon la revendication 1, caractérisée en ce qu'un ferrite au manganèse-zinc est utilisé comme matériau de ferrite.
  4. Utilisation selon l'une des revendications 1 et 3, caractérisée en ce que des résines thermodurcissables sont utilisées comme matière synthétique.
  5. Utilisation selon l'une des revendications 1 à 3, caractérisée en ce que de la résine époxy est utilisée comme matière synthétique.
  6. Utilisation selon l'une des revendications 1 à 5, caractérisée en ce qu'un ferrite au nickel-zinc et une résine époxy sont utilisés dans une proportion de mélange de 83 à 88 % en poids de ferrite et de 12 à 17 % en poids de résine époxy.
EP92119218A 1991-11-11 1992-11-10 Utilisation d'un matériau magnétique pour noyaux de bobbine Expired - Lifetime EP0542200B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9218475U DE9218475U1 (de) 1991-11-11 1992-11-10 Magnetisches Material für Spulenkerne

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4137042 1991-11-11
DE4137042 1991-11-11

Publications (2)

Publication Number Publication Date
EP0542200A1 EP0542200A1 (fr) 1993-05-19
EP0542200B1 true EP0542200B1 (fr) 1998-04-15

Family

ID=6444529

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92119218A Expired - Lifetime EP0542200B1 (fr) 1991-11-11 1992-11-10 Utilisation d'un matériau magnétique pour noyaux de bobbine

Country Status (2)

Country Link
EP (1) EP0542200B1 (fr)
DE (1) DE59209285D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10000523A1 (de) * 2000-01-08 2001-07-26 Inst Maschinen Antriebe Und El Ferrit-Compound-Material mit hoher elektromagnetischer Absorption im Frequenzbereich von 20 MHz bis 40 GHz

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989475A (en) * 1955-10-25 1961-06-20 Steatit Magnesia Ag Ferrite of field independent permeability
DE69012398T2 (de) * 1989-04-19 1995-02-02 Toda Kogyo Corp Ferritteilchen und Ferrit-Harz-Komposit für Verbundmagnetkern und Verfahren zu deren Herstellung.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Gerhard Schnell, "Sensoren in der Automatisierungstechnik", April 1991, Seite 19 *

Also Published As

Publication number Publication date
EP0542200A1 (fr) 1993-05-19
DE59209285D1 (de) 1998-05-20

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