Strong magnetic field permanent magnetic mechanism for preventing abnormal magnetization

Abstract

This invention relates to a strong magnetic field magnet body avoiding abnormal magnetization, in which, 8-64 blocks of NdFeB unit magnets are conglutinated to a hollow column, soft magnetic material is set on the central position of the magnet body and the outside surface of which is blocked by a metal shell characterizing that the unit magnets are divided into inside and outside two layers adhered by NdFeB of different characters or adhered by NdFeB and soft magnet material, and the outer layer of the unit magnets set vertically is NdFeB and the inter layer is soft magnet material turning narrower along the core direction and flux in the magnetic channels gathers into a central gap gradually and small soft magnet material is also set in either unit magnet, the width of the bottom edge of this invented soft magnet material is wider than that in the current technology. This invention also applies a fixed shell of magnetic shield.

Description

technical field [0001] The invention relates to a strong magnetic field permanent magnet mechanism, in particular to a strong magnetic field permanent magnet mechanism which avoids abnormal magnetization, is an improvement on the existing strong magnetic field permanent magnet mechanism, and belongs to the permanent magnet strong magnetic field technology. Background technique [0002] Traditional permanent magnet mechanisms are generally composed of permanent magnets and soft iron poles. The air gap field strength cannot exceed the permanent magnet material Br. Even if NdFeB with a remanence of 1.2T is used, the air gap field strength generally does not exceed 1T. To obtain a magnetic field exceeding the remanence of permanent magnet materials, a special permanent magnet structure must be adopted. [0003] The magic ring is a hollow cylinder made entirely of permanent magnet materials, so that the magnetization direction of the permanent magnet materials changes in differen...

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Problems solved by technology

[0007] 2. Partial demagnetization

However, the air gap magnetic field in the effective area of ​​the magic ring is still relatively low. This is because although the addition of the upper and lower soft iron magnetic poles has played an obvious role in magnetic concentration, the non-magnetic metal areas on both sides of the central air gap in the horizontal direction are equivalent to open circuits. Weaken the central air gap magnetic field

In addition, the bottom edge of the upper and lower soft iron poles is narrower than the central air gap, resulting in a strong magnetic field directly under the soft iron poles, while the magnetic fields on the left and right sides of the air gap are weak, thus destroying the uniformity of the magnetic field in the central effective area

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