SU1083241A1 - Process for producing large-sized permanent magnets - Google Patents

Abstract

A method for producing large sized permanent magnets by connecting along side faces of smaller magnetically pre-magnetized magnets, the coercive force of which is not less than 30% greater than the coercive force of the material, characterized in that, in order to reduce the non-uniformity, the large-size permanent magnet has a large unifferent magnet, in order to reduce the inhomogeneity of the material. the values of the magnetization averaged over the volume correspond to the ratio J: Jj: Jj 8: 9: 10, and they are arranged in a large-sized permanent magnet so that In accordance with the indicated magnetization, the first are surrounded by two, the second by three, and the third by four non-pole grams.

Description

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The invention relates to electrical engineering, in particular, to methods for producing large-sized permanent magnets.

A known method for producing large-sized magnets (blocks) by gluing, welding, welding, etc. of small-sized magnets of a simple form 1.

However, this method does not guarantee the production of large-sized magnets with a uniform self-field without additional conditions.

The closest in technical essence to the present invention is a method of obtaining large-sized permanent magnets by connecting along side edges of pre-magnetized magnets of smaller sizes, the coercive force of which exceeds the coercive force of the material by not less than 30%.

The disadvantage of this method is that the selection of modules with absolutely identical properties in large quantities is difficult, and the fact that, with the same initial properties of the modules, depending on the location of the modules in the block, the latter will experience different demagnetizing fields depending on whether they are surrounded or not. in a block on four, three, or two sides with other magnets. As a result, the heterogeneity of the block floor is inevitable.

The purpose of the invention is to reduce the heterogeneity of the floor of a large permanent magnet.

The goal is achieved by the fact that according to the method of obtaining large-sized permanent magnets by connecting along the side edges of pre-magnetized magnets of smaller sizes, the magnitude of the coercive force of which is not less than 30% higher than the coercive force of the material, the magnets of smaller sizes are chosen so that the volume averaged the values of the magnetization correspond to the ratio J: J2: Js 8: 9: 10, and they are located in a large permanent magnet so that, in accordance with the indicated magnetization, the first us two, the second - in three, and the third - in the four non-pole face M.

With this arrangement, the magnet placed in the center of the block has the highest magnetization and the action of the demagnetizing field of the surrounding, its neighboring magnets shifts the operating point on the demagnetization curve to the same state as the magnets located along the edges of the block (surrounded by three and two non-polar gran M) and possessing, respectively, a smaller, volume-averaged magnetization.

The method is carried out as follows.

- A batch of permanent magnets is taken, for example, from a magnetically hard sintered material, their magnetic properties are measured and magnets are taken, in which the magnitude of the coercive magnitude by 30% or more must exceed the coercive force by induction, the average magnetization of individual magnets in a free magnetization states must be a series of J: J2: J 3 8: 9: 10, i.e. different for eg magnets made of material

Q КС37А at 0.16 and 0.08 T, if the magnetization of the magnets constituting the third row is equal to 0.8 T. With a ratio of J: J2: Jj of 8: 9: 10, the inhomogeneity coefficient of the own field of a large-sized magnet, estimated from the ratio

., sluBol

k5

Dncp

where dB „В„ - First;

BV - measured value of normal

magnetic induction component at the magnet pole;

In l. Med.-Average magnetic induction at the magnet pole is 0.005.

When the ratio Jj: Jj: J3 is 8: 9: 11 and Ji: J2: Jj 6: 9: 10, this coefficient is equal to 1.35 and 0.124, respectively.

The number of selected magnets and the ratio of their properties in accordance with the indicated row is determined by the area of the assembly. Their connection is made, for example, by gluing using various devices: steel plate, clamps, etc. The proposed method of obtaining large-sized permanent magnets can significantly improve the quality of the magnets by increasing the uniformity of the distribution of their properties by volume.

Claims (1)

METHOD FOR PRODUCING LARGE-DIMENSIONAL PERMANENT MAGNETS by connecting along the lateral edges of pre-magnetized smaller magnets, the coercive force of which is not less than 30% higher than the coercive force of the material, characterized in that, in order to reduce the inhomogeneity of the field of the large-sized permanent magnet under magnets, smaller such that the volume-averaged magnetization values correspond to relative J _t: J _{2: J}} = 8: 9: 10, and their features in a large-sized permanent magnet so that the soot etstvii with said first magnetization surrounded by two, the second - on three, and the third - on the four non-pole faces. QO GO N0 hU