DE459557C - Magnetic body made of pressed insulated magnetic powder - Google Patents

Magnetic body made of pressed insulated magnetic powder

Info

Publication number
DE459557C
DE459557C DEA42940D DEA0042940D DE459557C DE 459557 C DE459557 C DE 459557C DE A42940 D DEA42940 D DE A42940D DE A0042940 D DEA0042940 D DE A0042940D DE 459557 C DE459557 C DE 459557C
Authority
DE
Germany
Prior art keywords
magnetic
body made
magnetic powder
pressed
powder
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
DEA42940D
Other languages
German (de)
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.)
AEG AG
Original Assignee
AEG 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 AEG AG filed Critical AEG AG
Priority to DEA42940D priority Critical patent/DE459557C/en
Application granted granted Critical
Publication of DE459557C publication Critical patent/DE459557C/en
Expired 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
    • H01F1/14—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 metals or alloys
    • H01F1/20—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 metals or alloys in the form of particles, e.g. powder
    • H01F1/22—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 metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—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 metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated

Landscapes

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

Description

Magnetkörper aus gepreßtem isolierten magnetischen Pulver. Magnetkörper für Induktionsspulen (Pupinspulen) und ähnliche Apparate werden heute vielfach durch Zusammenpressen von isolierten magnetischen Pulverteilchen hergestellt. Die Isolation der Einzelteilchen ist zur Vermeidung von Wirbelströmen erforderlich. Durch die quer zur magnetischen Feldrichtung liegenden Teile der Isolationsschichten wird jedoch die magnetische Leitfähigkeit herabgesetzt. In manchen Fällen ist allerdings die mit der Verminderung der wirksamen Permeabilität verbundene größere magnetische Stabilität erwünscht. In anderen Fällen jedoch, in welchen es sich nur darum handelt, einen wirbelstromarmen Körper zu schaffen, ist diese Herabsetzung der Leitfähigkeit sehr unangenehm, wie an einem Beispiel gezeigt werden möge.Magnetic body made from pressed insulated magnetic powder. Magnetic body for induction coils (Pupin coils) and similar devices are used today in many cases Compression made of isolated magnetic powder particles. The isolation of the individual particles is necessary to avoid eddy currents. Through the parts of the insulation layers lying transversely to the magnetic field direction however, the magnetic conductivity is reduced. In some cases it is the greater magnetic one associated with the reduction in effective permeability Stability desired. In other cases, however, in which it is only a question of Creating a body with little eddy currents is this decrease in conductivity very uncomfortable, as an example may show.

Um für eine Kreisfrequenz von co - iol; einen für Pupinspulen technisch brauchbaren Magnetkörper zu erhalten, darf man nur Eisenteilchen von höchstens etwa o,ooi mm (Querschnitt verwenden. Eine elementare Rechnung zeigt nun, daß man Isolationsschichtdicken von weniger als i oo p,ru verwenden muß, um bei genügend großer Perineabilität des magnetischen Ausgangsmaterials eine größere wirksame magnetische Leitfähigkeit des Preßkörpers als io zu erzielen. Derart kleine Isolationsschichten sind aber nach dem bisher bekannten Verfahren nicht technisch herzustellen. Außerdem würden so dünne Schichten den Beanspruchungen durch den hohen Preßdruck keineswegs gewachsen sein.In order for an angular frequency of co - iol; one for pupin coils technically To get usable magnetic bodies, one may only use iron particles of at most about o, ooi mm (use cross-section. An elementary calculation now shows that insulation layer thicknesses of less than i oo p, ru must use, if the perineability of the magnetic starting material has a greater effective magnetic conductivity of the To achieve pressed body as io. Such small insulation layers are, however, after the previously known process cannot be produced industrially. Besides, would like that thin layers are in no way able to withstand the stresses caused by the high pressure be.

Als Isolationsmaterial für die Pulverteilchen sind bisher flüssiger Lack, Gummilösung, Harze oder körnig gepulvertes Material aus Glas, Porzellan, Glimmer u. dgl. verwendet worden. Gemäß der vorliegenden Erfindung wird als Isolationsmaterial Glimmer in einer besonders vorteilhaften Form, nämlich blättchenförmig, verwendet. Gegenstand der Erfindung ist somit ein Magnetkörper aus gepreßtem isolierten magnetischen Pulver, bei welchem als Isolationsmaterial feine, ohne Anwendung von Bindemitteln mit dem magnetischen Pulver zusammengepreßte Gliminerblättchen dienen. Der Zweck der Verwendung blättchenförmiger Glimmerteilchen ist der, daß durch sie die magnetischen Teilchen im wesentlichen nur in der zur Feldrichtung parallelen Ebene isoliert werden und der magnetische Schluß der Pulverteilchen in der Richtung des magnetischen Kraftfeldes nicht beeinträchtigt ist.As an insulation material for the powder particles are so far more liquid Lacquer, rubber solution, resins or granular powdered material made of glass, porcelain, mica and the like have been used. According to the present invention, as an insulation material Mica is used in a particularly advantageous form, namely flaky. The invention thus relates to a magnetic body made from pressed, insulated magnetic Powder, which is used as a fine insulating material, without the use of binders Gliminer flakes pressed together with the magnetic powder are used. The purpose The use of flaky mica particles is that through them the magnetic Particles are essentially isolated only in the plane parallel to the field direction and the magnetic closure of the powder particles in the direction of the magnetic force field is not affected.

Dies wird dadurch erreicht, daß die blättchenförmigen Glimmerteilchen sich unter der Einwirkung des senkrecht zur Feldrichtung ausgeführten Preßdruckes senkrecht zur Preßrichtung, also parallel zur Feldrichtung einstellen. Durch die Verwendung der blättchenförmigen Glimmerteilchen werden somit die Wirbelstromverluste im Prellkörper auf ein gerinbes Mali herabgesetzt, ohne daB die magnetische Leitfähigkeit stark beeinträchtigt wird. Glimmer hat bekanntlich die Eigenschaft, sich leicht in zusammenhängenden Blättchen von der Stärke weniger Moleküllagen zerspalten zu lassen.This is achieved in that the flaky mica particles under the action of the pressure applied perpendicular to the field direction Set perpendicular to the pressing direction, i.e. parallel to the field direction. Through the Use of the leaflet Mica particles are thus the Eddy current losses in the impact body are reduced to a small amount without any loss the magnetic conductivity is severely impaired. As is well known, mica has the property of being slightly less thick in contiguous leaflets To split molecular layers.

Claims (1)

PATENTAITSPRUCH Magnetkörper aus geprelltem isolierten magnetischen Pulver, dadurch gekennzeichnet, daB als Isolationsmaterial feine, ohne Anwendung von Bindemitteln mit dem magnetischen Pulver zusammengepreßte Glimmerblättchen benutzt sind.PATENT CLAIM Magnetic body made of bruised isolated magnetic Powder, characterized in that as an insulation material fine, without application Mica flakes compressed by binding agents with the magnetic powder are used are.
DEA42940D 1924-08-31 1924-08-31 Magnetic body made of pressed insulated magnetic powder Expired DE459557C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA42940D DE459557C (en) 1924-08-31 1924-08-31 Magnetic body made of pressed insulated magnetic powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA42940D DE459557C (en) 1924-08-31 1924-08-31 Magnetic body made of pressed insulated magnetic powder

Publications (1)

Publication Number Publication Date
DE459557C true DE459557C (en) 1928-05-05

Family

ID=6933385

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA42940D Expired DE459557C (en) 1924-08-31 1924-08-31 Magnetic body made of pressed insulated magnetic powder

Country Status (1)

Country Link
DE (1) DE459557C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE971698C (en) * 1933-12-05 1959-03-12 Bosch Gmbh Robert Process for the production of a magnetic body for high frequency coils made of finely divided magnetic particles and an insulating material
DE977502C (en) * 1950-04-27 1966-09-15 Gen Aniline & Film Corp Process for the production of a carbonyl iron powder suitable for the production of magnetic cores with a high specific resistance and low energy loss at very high frequencies

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE971698C (en) * 1933-12-05 1959-03-12 Bosch Gmbh Robert Process for the production of a magnetic body for high frequency coils made of finely divided magnetic particles and an insulating material
DE977502C (en) * 1950-04-27 1966-09-15 Gen Aniline & Film Corp Process for the production of a carbonyl iron powder suitable for the production of magnetic cores with a high specific resistance and low energy loss at very high frequencies

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