SU866588A1 - Magnetic core - Google Patents

Description

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The invention relates to magnetic cores used in electronics and can be used in the development of radio components and magnetic elements of electronic equipment.

Radio components and magnetic elements with non-reciprocal properties and with combined functions can be built using as the material of the cores heterogeneous magnetic materials with an offset hystereis loop.

A magnetic device is known which contains magnetically coupled ferromagnetic and ferrimagnetic parts subjected to heating to a temperature above the Neel temperature and subsequent cooling to a temperature below the Neel temperature and mechanical deformation. Structurally, the magnetic field is a metal wire or rod, covered with a layer of ferrite 1;

The disadvantages of this technical solution are the difficulty of fabricating the metal base structure - the ferrite layer, as well as the presence of an additional technological operation - the thermomechanical treatment of the magnetic body, which is difficult to automate.

The closest in technical essence to the present invention is a ferrite magnetic core, into which several plates of metallic ferromagnetic or magnetic dielectric with large particles are inserted in the path of magnetic field lines.

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A disadvantage of the known device is the impossibility of its use in the development of radio components and magnetic elements of electronic equipment.

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The purpose of the invention is to expand the functionality.

This goal is achieved by the fact that in a magnetic core containing a magnetic core of magnetically soft 20 materials, radially arranged slots for plates, the plates are made of a hard magnetic material, mainly of anisotropic barium hexaferrite.

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The plates of magnetically hard material are magnetized to saturation in the direction of the axis of the magnetic circuit so that the families of their magnetic field lines are oriented in

30 same direction and had

ijMyrpj m.ich1I | -oirovod area recalculate. The state of magnetization created in this way causes the asymmetry of the magnetic y-hysteresis of the magnetic material and the displacement of the hysteresis of the core.

The parameters of the hysteresis loop and the magnitude of its displacement are determined by the magnetic parameters of the materials of the base core and the insert plates and the ratio of their geometrical dimensions.

FIG. Figures 1 and 2 show a hysteresis loop of magnetically soft ferrite and its displacement.

The core of the loop is a toroidal ferrite core of size K 16x8x6 of 2500 HMCI magnet ferrite magnet, magnetic hard insert plates are made of anisotropic barium hexaferrite of brand ZBA. In order to increase the displacement of the hysteresis loop, more than two hard magnetic inserts could be inserted into the grooves made in the main core (ut) (Fig. 16). Fig. 26 shows an offset hysteresis loop of a core of size K 20x x10x5 from magnet of 2000 HMI magnet ferrite magnetised by four plates of barium hexa ferrite brand PFA (Fig. 2a). In order to simplify the technological process, the manufacture of grooves -d magnetically hard inserts can be provided at the stage of magnet pressing soft ferrite cores.

The proposed magnetic cores with a displaced hysteresis loop can be used in the development of new radio components and magnetic elements with nonreciprocal properties and with combined functions. Using known heterogeneous magnetic systems with

a displaced hysteresis loop would require the development of new magnetic materials and technological processes, and the parameters and magnitudes of the displacement of the hysteresis loop would be severely limited by the nature of this system.

The proposed cores can be made from materials of industrially produced brands, with the parameters of the hysteresis loop and its value

Spaces can be adjusted within wide limits by changing the ratio of the geometric dimensions of the core base and liners. The manufacture of the grooves of 1 pc of hard magnetic liners can be combined with the operation of pressing the main cores. Thus, the technology will not significantly complicate, while the use of known heterogeneous magnetic systems with a displaced hysteresis loop requires an additional technological operation that is difficult to automate — thermomechanical processing.

Claims (2)

1. USSR author's certificate 101151, cl. H 01 F 3/08, 1955. , 2. US patent No. 3116255, cl. USA 252-625, H 01 F 1/00, 1961.