CH290119A - Magnetic core. - Google Patents

Description

  

      Magnetic core. For AC magnetic cores, the iron has to be laminated for known reasons. As a result, the magnet shape is more or less tied to the plane of the lamellae; If it deviates significantly from this, the iron core must be composed of several lamella packs. This is usually very cumbersome; In addition, the resulting butt joints increase the magnetic resistance of the core.

   When it comes to shaping the magnetic cores, the design engineer’s hands are therefore very tied. It was proposed early on to cast iron cores from iron powder and binding agent, to press, etc., in order to obtain greater freedom of movement for the shaping of the core. Such cores have also been found where no high force line densities are required, e.g. B. in the radio frequency, telephone field and the like, introduced. For small motors, relays, measuring devices, counters, etc., however, these mass cores had to be eliminated because of their high magnetic resistance, because they would have to have cross-sections that were much too large.

   The same applies to ceramic, magnetically conductive cores. If you sinter the iron cores from iron powder, you can achieve relatively high force lines, but such cores are laborious to manufacture and are expensive.



  The magnetic core according to the invention with un divided iron is characterized by a wire body pressed from superficially insulated iron wire.



  For surface insulation see be especially those newer paints, for example based on polyamide, which are used as a coating even with cold forming, e.g. B. squeezing the wire, maintain their shape, because then even after the wire ball has been compressed, the individual wires are still separated from one another by thin layers of insulation, so short-circuit windings are prevented. However, the insulation layers are allowed to glue together so that the body has a sufficiently high mechanical strength.



  In order to achieve sufficiently strong cores, the wire body can be zen verset with a hardenable resin or synthetic resin before compaction or it can be soaked or coated with such a substance after compaction. To save on resin, you can add filler to it. It is best to use magnetically conductive fillers, e.g. B. finely divided iron powder, use iun to increase the magnetic conductivity of the core.

    The wire can be filled into the press mold in the form of small balls, possibly compacted into tablets, in the form of grids or the like.



  There are already iron cores made of wire, e.g. B. for small transformers for telecommunications purposes, known. Here, however, the wire is wound through the magnet winding, but not pressed in the form of balls, for example. This winding is cumbersome and time consuming and can only be used for certain core shapes.

 

Claims (1)

PATENT CLAIM: Magnetic core with divided iron, characterized by a wire body pressed from superficially insulated iron wire. SUBClaims: 1. Magnetic core according to claim, characterized in that the wire insulation is an insulating coating consisting of a Laek that is retained when the wire is squeezed. 2. Magnetic core according to claim and dependent claim 1, characterized in that the cavities of the wire body are filled with hardened synthetic resin. 3. Magnetic core according to claim and dependent claims 1 and 2, characterized in that the synthetic resin contains egg powder as a filler.