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Rare earth sintered magnet, method for producing rare earth sintered body, method for producing rare earth sintered magnet, and linear motor using rare earth sintered magnet

A manufacturing method and technology for sintering magnets, which are applied in the manufacture of stator/rotor bodies, magnetic circuits characterized by magnetic materials, inductance/transformer/magnet manufacturing, etc., can solve the problems of low productivity and high cost, and achieve improved torque, Reduction in size, miniaturization and weight reduction

Active Publication Date: 2019-12-27
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to align the permanent magnets with the Halbach array, it is necessary to join plural permanent magnets in a state of mutual repulsion, so there are problems of low productivity and high cost.

Method used

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  • Rare earth sintered magnet, method for producing rare earth sintered body, method for producing rare earth sintered magnet, and linear motor using rare earth sintered magnet
  • Rare earth sintered magnet, method for producing rare earth sintered body, method for producing rare earth sintered magnet, and linear motor using rare earth sintered magnet
  • Rare earth sintered magnet, method for producing rare earth sintered body, method for producing rare earth sintered magnet, and linear motor using rare earth sintered magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] The neodymium-iron-boron alloy is pulverized by a jet pulverizer so that the central particle size becomes 3 μm, and then styrene-isoprene block copolymer (SIS resin: Q3390 manufactured by Japan Zeon Co., Ltd.) was filled into a mold having A side×B side×C side=19 mm×14 mm×4 mm, thereby performing molding. Specifically, 4 parts by weight of SBS resin, 1.5 parts of 1-octadecyne (octadecyne), and 4.5 parts of 1-octadecene (octadecene) were mixed with respect to 100 parts by weight of magnet powder to prepare Composition composed of magnetic powder and binder (binder) components. Using a pulsed magnetic field generator equipped with a multilayer coil and a large-capacity capacitor, apply a part of a circular magnetic field (for an application time of 0.7 milliseconds or less) to the molded body in a direction parallel to the surface formed by sides A and C, and repeat 3 times, so that the easy magnetization axis image of the magnet material particles figure 2Polar anisot...

Embodiment 2、3

[0094] An experiment was performed in the same manner as in Example 1 except that the molded dimensions of the composition were changed. It should be noted that, in Example 2, molding was performed using a mold of 19 mm×14 mm×2 mm, and in Example 3, molding was performed using a mold of 19 mm×14 mm×6 mm. Meanwhile, the C sides (thicknesses) of the rare earth sintered bodies were 2 mm and 6 mm, respectively.

Embodiment 4

[0096] The difference from Example 1 is that a styrene-butadiene elastomer (TR2250 manufactured by SBS resin JSR Corporation) was used as a binder component. Specifically, 5 parts by weight of SBS resin, 1.2 parts of 1-octadecene, and 3.6 parts of 1-octadecene were mixed with respect to 100 parts by weight of magnet powder, thereby preparing a magnetic powder and adhesive Composition composed of medicinal ingredients.

[0097] In addition, it is different from Example 1 in that the orientation temperature for applying a magnetic field is 150° C., and the number of times of applying a magnetic field is 5 times. The other conditions were the same as in Example 1, and thus the experiment was carried out.

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Abstract

Provided is a rare earth sintered magnet in which a plurality of magnetic material particles has been sintered, wherein the maximum value of the surface magnetic flux density falls in the range of 350mT to 600 mT, the thickness falls in the range of 1.5 mm to 6 mm, a cross-section parallel to the thickness direction is non-circular, and an easily magnetized axis of the magnetic material particleswith respect to the cross-section has a polar anisotropically oriented area.

Description

technical field [0001] The present invention relates to a rare earth sintered magnet, a method for producing a rare earth sintered body, a method for producing a rare earth sintered magnet, and a linear motor using the rare earth sintered magnet. Background technique [0002] In recent years, machine tools, vehicles, airplanes, wind turbines, and the like generally use generators that convert mechanical kinetic energy transmitted from engines and the like into electrical energy, or motors (electric motors) that convert electrical energy into mechanical kinetic energy conversely. In addition, it is desired to further increase the power generation capacity and / or torque (torque) of the above-mentioned generator or motor, and realize miniaturization and weight reduction. [0003] Here, in the permanent magnets used in the above-mentioned motors, in order to improve the magnetic properties, a magnetic field orientation (magnetic field orientation) is performed in which the axes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F1/057H01F41/02H02K15/03H02K41/02
CPCH02K15/03H02K41/02H01F7/02H01F41/0273H01F1/0577H01F1/057H01F41/02H02K41/031H02K1/02
Inventor 藤川宪一山本贵士齐藤正一朗尾崎孝志久米克也平野裕树
Owner NITTO DENKO CORP