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Resource-saving high-performance combined rare earth permanent magnet and preparation method thereof

A rare-earth permanent magnet and resource-saving technology, which is applied in the direction of magnets, magnetic objects, permanent magnets, etc., can solve the problems of difficult-to-segment magnetic supplement, poor magnetic flux enhancement effect, complex structure, etc., and achieve manufacturing and processing accuracy that is easy to control and reduce Difficulty in magnetization and wide range of applications

Pending Publication Date: 2021-07-09
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to effectively solve the problems of complex structure, poor magnetic flux enhancement effect, and difficulty in supplementing magnetic flux in slices existing in existing combined permanent magnets, the present invention proposes a method for preparing resource-saving combined rare earth permanent magnets. The magnetic monomer and soft magnetic monomer are combined in order to obtain a high-performance combined permanent magnet with simple structure, strong adjustability, and obvious increase in magnetic flux

Method used

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  • Resource-saving high-performance combined rare earth permanent magnet and preparation method thereof
  • Resource-saving high-performance combined rare earth permanent magnet and preparation method thereof
  • Resource-saving high-performance combined rare earth permanent magnet and preparation method thereof

Examples

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preparation example Construction

[0060] A method for preparing a resource-saving high-performance combined rare earth permanent magnet, comprising the steps of:

[0061] 1) Prepare a sheet-like monomer material, wherein the composition of the rare earth permanent magnet monomer 11 is Nd 2 Fe 14 B. SmCo 5 or Sm 2 co 17 A kind of; the composition of the soft magnetic monomer 12 is a kind of Fe, Fe-Si, Ni-Fe;

[0062] 2) Polishing the surface of the above-mentioned sheet-shaped monomer material, and then finishing by mechanical processing and electric machining, and processing it into a sheet-shaped monomer meeting the requirements; the cross-section of the sheet-shaped monomer is circular;

[0063] 3) Before assembly, magnetize in a strong magnetic field to obtain rare earth permanent magnet monomers 11 with different magnetic polarities, so that each rare earth permanent magnet monomer 11 has a single magnetic pole direction;

[0064] 4) A plurality of rare earth permanent magnet monomers 11 and soft magn...

Embodiment 1

[0077] Embodiment 1 of the present invention provides a combined magnet, which is composed of a rare earth permanent magnet monomer 11, a soft magnetic monomer 12 and a magnetic shielding protective cover 2, such as Figure 4 shown. The permanent magnet monomer is made of rare earth neodymium iron boron NdFeB, the soft magnetic monomer is made of iron sheet Fe, and the magnetic shielding protective cover is made of electromagnetic pure iron. The permanent magnet monomer and the soft magnetic monomer are stacked at both ends along the thickness direction, and the magnetic shielding protective sleeve is placed outside the fixed magnet and does not cover the two poles.

[0078] In this example, the radius of the NdFeB monomer and the iron monomer is 7.5 mm, and the thickness is 1 mm. One iron monomer is stacked on one end of nine NdFeB monomers to form a magnet. The magnetic shielding protective sleeve covers the side of the magnet, with a length of 10mm and a thickness of 2mm. ...

Embodiment 2

[0082] Embodiment 2 of the present invention provides a combined magnet, which is composed of a rare earth permanent magnet monomer 11, a soft magnetic monomer 12 and a magnetic shielding protective cover 2, such as Figure 5 shown. The permanent magnet monomer is made of rare earth neodymium iron boron NdFeB, the soft magnetic monomer is made of iron sheet Fe, and the magnetic shielding protective cover is made of electromagnetic pure iron. A plurality of disc-shaped permanent magnet monomers and soft magnetic monomers are stacked at both ends along the thickness direction, and the magnetic shielding protective sleeve is placed outside the magnets fixed together, and does not cover the two poles.

[0083] In this example, the radius of the NdFeB monomer and the iron monomer is 7.5 mm, and the thickness is 1 mm. Four iron monomers are stacked on one end of seven NdFeB monomers to form a magnet. The magnetic shielding protective sleeve covers the side of the magnet, with a len...

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Abstract

The invention belongs to the technical field of rare earth permanent magnet materials, and relates to a resource-saving high-performance combined rare earth permanent magnet and a preparation method thereof. The combined rare earth permanent magnet is formed by overlapping a plurality of sheet-shaped single bodies; the sheet-shaped single bodies comprise rare earth permanent magnet single bodies and soft magnetic single bodies; the rare earth permanent magnet monomers and the soft magnetic monomers are made of alloy materials; and the sheet-shaped single bodies are fixed by a connecting mechanism to form a complete magnet. The combined rare earth permanent magnet not only can effectively reduce eddy current loss, but also can greatly improve the magnetic performance of the working end of the combined permanent magnet while reducing material cost, so the combined rare earth permanent magnet can be widely applied to products needing to provide a strong magnetic field on one side, such as a magnetic therapy mattress and a magnet neck guard. In addition, the connecting mechanism on an outer magnetic shielding protective sleeve can effectively adjust the size of the magnetic field according to needs, so the individual needs of users are met. The combined rare earth permanent magnet has wide application and market prospects, and is a novel technology with high potential.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, in particular to a resource-saving high-performance combined rare earth permanent magnet and a preparation method thereof. Background technique [0002] Since the discovery of the second-generation permanent magnet materials (samarium-cobalt Sm-Co) and the third-generation permanent magnet materials (Nd-Fe-B Nd-Fe-B), the intermetallic compounds formed by rare earth metal elements and transition group metal elements are The rare earth permanent magnet material of the main phase of the matrix has become a permanent magnet material with the highest comprehensive performance known so far. At the same time, rare earth permanent magnet materials, as the largest, most widely used and fastest-growing industry in my country's rare earth application field, account for about 40% of my country's total rare earth consumption, and are a major development direction of my country's...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F7/00H01F1/055H01F1/16H01F41/02
CPCH01F7/0215H01F7/00H01F1/055H01F1/16H01F41/0233H01F41/0253
Inventor 刘丹彭飞赵同云沈保根
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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