LV14108B - Multipolar magnetizing device - Google Patents

Abstract

The offered multipolar magnetizing device is used for magnetization of elastic permanent sheet magnets. The cylindrical revolving inductor device consists of ring-wise NdFeB permanent magnets 1 located on non-magnetic shaft 3. The magnets are divided by ferromagnetic disks 2 (Fig.1). The NdFeB permanent magnets axial magnetizing is achieved in such a manner that creates on the external surfaces of the ferromagnetic disks and the surface of the elastic magnet 4 create poles of opposite polarity. To increase the magnetic intensity of the magnetizing field the elastic magnet settles down on the ferromagnetic core. At the magnetization of lengthy (rolled) elastic magnets the magnetic core is executed in the form of a revolving cylinder with an axis parallel to the inductor axis. The elastic magnet moves during the magnetization in the gap between the revolving inductor and the magnetic core. The offered multipolar magnetizing device allows to increase the intensity of an inductor magnetizing field, to lower the amount of energy consumption and to increase the reliability of the devices during the magnetization of elastic magnets.

Description

DESCRIPTION OF THE INVENTION

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This invention relates to the field of production of permanent magnets in the form of elastic sheets, which are widely used in various electrotechnical products, magnetotherapy, promotional articles and the like.

Flexible magnets belong to highly coercive magnetic materials whose magnetization is possible in magnetic fields with an intensity of 5-7 times the coercive force of the material. Therefore, magnetization in pulsed magnetic fields is currently used for small magnets. The inductor is designed as a flat magnet wire with magnetized winding windings embedded in the open grooves on the work surface [1]. The flexible magnet is located on the work surface of the inductor. A capacitor battery is used to create a pulsed field by discharging it through a magnetizing coil. The main drawback of such inductors is the limited size of the magnetizable materials and the considerable difficulty in magnetizing the garmer (coil) materials.

In a constructive sense, the proposed technical solution is a device for magnetizing foil [2], which consists of a cylindrical ferromagnetic inductor on which a magnetizing coil is placed on its surface. As the cylinder rotates, the magnetizable sheet of the elastic magnet moves along its surface, forming polar poles on the magnet's working surface. The device provides multipole magnetization of elastic magnetic materials of garmer (rolls). The disadvantages of this device are the high power consumption in the magnetizing winding, the low reliability of the device operation due to the presence of the brush-contact assembly.

Purpose and substance of the invention

The object of the invention is to increase the intensity of the magnetic field on the surface of the inductor, to reduce the energy consumed and to increase the safety of the device at work.

The object is achieved by the fact that in the magnetizing device the cylindrical inductor consists of distributed ring-shaped permanent magnet discs of ferromagnetic material, axially magnetized in such a way that the polar magnetic disks have polarities of opposite polarity. This solution provides the possibility to increase the intensity of the magnetic field, as well as the uniform penetration of the field throughout the thickness of the material to be magnetized. Therefore, the elastic magnetizable material is located on a flat ferromagnetic base, a magnetic wire.

By magnetizing the garmer (coil) materials, the magnet wire is made as a rotating cylinder with its axis parallel to the inductor axis. The elastic material to be magnetized moves in the gap between the rotating cylinder and the inductor.

The invention is explained in the following figures, wherein:

- Sat. fig. a cross-section of the inductor and a sketch of the device with a magnetizable elastic magnet and lb. a cross-section of a magnetized elastic magnet is provided;

- Fig. 2 a sketch of the device is provided in the case of magnetization of a magnetic material on a flat base (magnetic wire);

- Fig. 3 A sketch of a magnetizing device is provided in which the magnet wire is made as a rotating cylinder.

In these drawings the following designations are used: 1 - permanent magnets, 2 ferromagnetic discs, 3 - inductor shaft, 4 - elastic magnet, 5 - flat base - magnet wire, 6 - magnet wire as a rotating cylinder, 7 - cylinder shaft; N and S are magnet poles with opposite polarity on the inductor surface.

The magnetizing device works this way. Ring-shaped permanent magnets 1 are made of high-energy materials, such as NdFeB, which have high magnetic properties such as permanent magnetic induction, coercive force and high specific magnetic energy. The magnetisation of the magnets is axial between the ends of the magnets (shown by arrows). Ferromagnetic discs 2 are mounted between the magnets on the inductor shaft. Each of these discs collects the magnetic flux from the end surfaces of two adjacent magnets and concentrates this flux on the surface of the magnetizable material. Permanent magnets are mounted such that poles of opposite polarity are formed on the outer surfaces of adjacent disks. The high value of the coercive force of the permanent magnets NdFeB and the concentration of the magnetic flux of the inductor in the area of the material to be magnetized allows to obtain magnetizing fields in the area sufficient for effective magnetization of the elastic magnet which is movable over the inductor. The inductor shaft is made of non-magnetic material.

In order to increase the intensity of the magnetic field and to enhance the effect of the magnetic field concentration in the magnetization zone, the elastic magnet 4 is located on a flat ferromagnetic magnetic wire 5 (Fig. 2).

For magnetizing elastic magnets of roller, the magnet wire is made as a rotating cylinder 6, the axis of which is parallel to the axis of the inductor or to the spindle 7 of the cylindrical magnet wire.

The performance and efficiency of the proposed device have been tested in the process of manufacturing flexible magnets at the Institute of Physical Energy and ZRF Magnetons.

The use of the proposed inductor allows the removal of rotating magnetizing coils on the inductor surface and the brush-contact assemblies, as well as increasing the safety of the magnetizing device and reducing the amount of energy required for magnetization.

Sources of information:

1. A. AneKceeB, A. KopHeB. MarHHTHBie ajiacTOMepBi. Μ. Χημηη, 1987, 240 c. (οτρ. 147-150)

2. D. Steingroever. Permanent magnet foil magnetizing device. Patent DE 4301771 (International Patent Class H01F13 / 00) 07.07.1994 (prototype).

Claims (3)

1. A multipole magnetizer for magnetizing a sheet of elastic magnets comprising a cylindrical rotary inductor on which the magnetizable material is moved, characterized in that said cylindrical inductor comprises: axially magnetized in such a way that polar poles of opposite polarity are formed on the outer surfaces of the ferromagnetic discs and on the surface of the elastic magnet. 2. The multi-pole magnetizer according to claim 1, wherein, in order to enhance the intensity of the magnetizing magnetic field, the elastic magnet is located on a ferromagnetic magnetic wire. 3. The multi-pole magnetizer according to claim 2, wherein the magnet wire is made in the form of a rotating ferromagnetic cylinder having an axis parallel to the axis of the inductor and in the gap between said cylinder and the inductor a flexible magnetizable sheet of ferromagnetic material.