DE575865C - Process for the production of divided magnetic cores - Google Patents

Process for the production of divided magnetic cores

Info

Publication number
DE575865C
DE575865C DEA61216D DEA0061216D DE575865C DE 575865 C DE575865 C DE 575865C DE A61216 D DEA61216 D DE A61216D DE A0061216 D DEA0061216 D DE A0061216D DE 575865 C DE575865 C DE 575865C
Authority
DE
Germany
Prior art keywords
magnetic cores
divided magnetic
production
core
insulation
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
DEA61216D
Other languages
German (de)
Inventor
Helmut Sprung
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 DEA61216D priority Critical patent/DE575865C/en
Application granted granted Critical
Publication of DE575865C publication Critical patent/DE575865C/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Heat Treatment Of Articles (AREA)

Description

Verfahren zur Herstellung unterteilter Magnetkerne In dem Hauptpatent ist ein Verfahren zur Herstellung unterteilter Magnetkerne beschrieben, das darin besteht, daß die Einzelelemente durch in in der Glühtemperatur beständiges Bindemittel zusammengehalten werden und der Kern nach der Zusammensetzung einem Erwärmungsprozeß unterworfen wird. Der Ausführung eines derartigen Erwärmungsprozesses stellen sich nun, und zwar insbesondere bei höheren Temperaturen, erhebliche Schwierigkeiten entgegen, da das dem Eisenpulver zur Isolierung beigefügte Isolationsmittel ein sehr schlechter Wärmeleiter ist und dieses somit einen schnellen Temperaturausgleich innerhalb des Kernes, wie er zur Erzielung günstiger magnetischer Eigenschaften erforderlich ist, verhindert. Auch sind beträchtliche Glühzeiten und sehr langsame Temperatursteigerungen erforderlich, um zu verhindern, daß der Kern infolge starker örtlicher Temperaturgefälle Risse bekommt und die Isolationsschichten zerstört werden.Method of making divided magnetic cores In the main patent describes a method for manufacturing divided magnetic cores, which therein consists that the individual elements by in in the annealing temperature stable binder are held together and the core after assembly a heating process is subjected. Such a heating process can be carried out now, especially at higher temperatures, there are considerable difficulties against, as the insulation agent added to the iron powder for insulation is a very poor conductor of heat and thus a rapid temperature equalization within the core, as it is to achieve favorable magnetic properties is required, prevented. Also, the glow times are considerable and very slow Temperature increases required to prevent the core from becoming strong as a result Local temperature gradient cracks and the insulation layers are destroyed.

Derartige Nachteile werden nun gemäß der Erfindung dadurch vermieden, daß die Wärme dem Magnetkern nicht von außen zugeführt, sondern mittels Wirbelströmen unmittelbar in jedem Eisenpulverköi-izchen erzeugt wird. Je nach dem Feinheitsgrad des Metallpulvers und der gewünschten Glühtemperatur können Frequenzen bis zu etwa. 5oo kHz erforderli.oli sein. Das Verfahren hat den Vorteil, daß der Glühprozeß in sehr kurzer Zeit ausgeführt werden kann, ohne das Isolationsmaterial irgendwie schädlich zu beeinflussen, und die Erhitzung mit sehr großer Gleichmäßigkeit erfolgt, so daß innere Spannungen nicht auftreten.Such disadvantages are now avoided according to the invention in that the heat is not supplied to the magnetic core from the outside, but is generated directly in each iron powder tube by means of eddy currents. Depending on the degree of fineness of the metal powder and the desired annealing temperature, frequencies up to about. 5oo kHz required. The method has the advantage that the annealing process can be carried out in a very short time without affecting the insulation material in any way, and the heating takes place with very great uniformity, so that internal stresses do not occur.

Je nach den Erfordernissen kann der Glühprozeß im Vakuum oder beliebiger Gasatmosphäre vorgenommen werden.Depending on the requirements, the annealing process can be in a vacuum or any other Gas atmosphere can be made.

Claims (1)

PATENTANSPRUCH: Die Erwärmung des Massekerns durch Erzeugung von Wirbelströmen in demselben bei dem Verfahren zur Herstellung unterteilter Magnetkerne nach dem Patent 399 167.PATENT CLAIM: The heating of the mass core by generating eddy currents in the same in the method for manufacturing divided magnetic cores according to the 399,167 patent.
DEA61216D 1931-03-20 1931-03-20 Process for the production of divided magnetic cores Expired DE575865C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA61216D DE575865C (en) 1931-03-20 1931-03-20 Process for the production of divided magnetic cores

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA61216D DE575865C (en) 1931-03-20 1931-03-20 Process for the production of divided magnetic cores

Publications (1)

Publication Number Publication Date
DE575865C true DE575865C (en) 1933-05-04

Family

ID=6942497

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA61216D Expired DE575865C (en) 1931-03-20 1931-03-20 Process for the production of divided magnetic cores

Country Status (1)

Country Link
DE (1) DE575865C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE760192C (en) * 1935-09-12 1954-03-08 Steatit Magnesia Ag Earth core for self-induction coils or the like and method for producing the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE760192C (en) * 1935-09-12 1954-03-08 Steatit Magnesia Ag Earth core for self-induction coils or the like and method for producing the same

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