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Yoke-integrated magnet

A technology of bonding magnets and yokes, applied in the direction of magnets, magnetic objects, cores/yokes, etc., can solve the problems of reduced dimensional accuracy, tin pollution, and reduced circularity, and achieve good corrosion resistance and size The effect of precision

Inactive Publication Date: 2009-05-27
DAIDO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the widely used electrophoretic coating method, it is difficult to avoid the situation that the dimensional accuracy decreases due to the indentation formed on the surface of the bonded magnet when the bonded magnet is held using the electrophoretic tool, and due to the deformation of the bonded magnet itself As a result, the circularity is reduced, and the above method also has the problem of being polluted by tin contained in the coating film.

Method used

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  • Yoke-integrated magnet
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  • Yoke-integrated magnet

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0025] exist figure 1 Shown in is the appearance of the magnet combined with the yoke, in figure 2 Shown in is a cross-sectional view of a magnet combined with a yoke. As shown in the respective drawings, a ring-shaped bonded magnet 2 is integrally provided on the back yoke 1 including a soft magnetic material and having a ring shape in such a manner as to be in contact with the inner periphery of the back yoke 1 . Such as figure 2 As shown, a groove having a certain width w1 and a certain depth d is formed as a resin recess 11 on the entire inner circumference of the opening at both ends of the back yoke 1 . The depth d is 20 to 500 μm and is approximately the same as the thickness of the injection molded layer 3 , which will be described later in this specification. The height of the cylinder of the bonded magnet 2 is lower than that of the back yoke 1, and the end faces 2a, 2b of the bonded magnet are recessed from the end faces 1a and 1b of the back yoke 1 to the inne...

no. 2 example

[0033] Such as Figure 6 As shown, when a groove having a certain width w2 and a certain depth d is formed on the entire periphery of the bonded magnet 2 facing the openings at both ends of the back yoke 1, a resin is formed between the bonded magnet 2 and the back yoke 1 Even when the recess 21 is formed, the same effect as that of the first embodiment can be obtained.

[0034] The present invention is not limited to the structure in which the back yoke 1 is located on the outer peripheral side of the bonded magnet 2 , and is also applicable to a yoke-bonded magnet having a structure in which the back yoke 1 is located on the inner peripheral side of the bonded magnet 2 .

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Abstract

The present invention provides a yoke-integrated magnet, including: a ring-shaped bond magnet containing a rare earth iron-based alloy magnetic powder and a synthetic resin binder; and a ring-shaped back yoke provided on an inner periphery or an outer periphery of the bond magnet to be integral with the bond magnet, in which at least a surface of the bond magnet at which the bond magnet does not contact with the back yoke is covered with an injection molding layer of a thermoplastic resin which does not contain tin. The yoke-integrated magnet of the invention is excellent in corrosion resistance and dimension accuracy and is free from the risk of contamination with tin.

Description

technical field [0001] The present invention relates to a yoke-bonded magnet, and more particularly, to a yoke-bonded magnet including a bonded magnet, which is good in corrosion resistance and dimensional accuracy and free from tin contamination. Background technique [0002] It has been noted that the magnetic characteristics of rare earth bonded magnets are significantly better than those of ferrite-based bonded magnets, but Nd-Fe-B-based or Sm-Fe-N-based raw material magnetic powder has the property of being prone to rust due to the inclusion of pure iron. Shortcomings. Therefore, such rust generation has been prevented at present by forming a coating film on the surface of the magnetic shaped article using spray coating or electrophoretic coating. Since the electrophoretic coating method is superior to the spray coating method in terms of the consistency of the coating film and the productivity, the electrophoretic coating method is generally used. [0003] Japanese P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/00H01F1/053H01F1/08B22F1/02
CPCH01F7/021H01F41/0266H01F3/10
Inventor 野田孝昭长谷川文昭仓田达彦水野一也
Owner DAIDO ELECTRONICS CO LTD