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Permanent magnets, electric motors and generators

A permanent magnet and atomic technology, applied in the direction of magnetic objects, electric components, magnetic circuit rotating parts, etc., can solve the problem of reducing the squareness ratio

Active Publication Date: 2017-06-13
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is considered that high concentration of Fe is effective for high magnetization of Sm-Co magnets, but the squareness ratio tends to decrease due to high concentration of Fe in the conventional manufacturing method

Method used

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  • Permanent magnets, electric motors and generators
  • Permanent magnets, electric motors and generators
  • Permanent magnets, electric motors and generators

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0017] Hereinafter, the permanent magnet of this embodiment is demonstrated.

[0018]

[0019] The permanent magnet of the present embodiment has the composition represented by the following composition formula: R p Fe q m r Cu t co 100-p-q-r-t

[0020] (wherein, R is at least one element selected from rare earth elements, M is at least one element selected from Zr, Ti, and Hf, p is a number satisfying 10.5≦p≦12.5 atomic %, q In order to satisfy the number of 23≦q≦40 atomic %, r is the number satisfying 0.88≦r≦4.5 atomic %, and t is the number satisfying 4.5≦t≦10.7 atomic %)

[0021] R in the composition formula is an element that can make the magnet material have greater magnetic anisotropy. For example, one or more elements can be selected from rare earth elements containing yttrium (Y) as R elements, such as samarium (Sm), cerium (Ce), neodymium (Nd), and praseodymium (Pr), etc. can be used, Particular preference is given to using Sm. For example, when a plurality...

no. 2 Embodiment approach

[0076] The permanent magnet of the first embodiment can be used in various electric motors and generators. In addition, it can also be used as a fixed magnet or a variable magnet of a variable flux motor or a variable flux motor. By using the permanent magnet of the first embodiment, various motors and generators are configured. When the permanent magnet of the first embodiment is applied to a variable flux motor, it is also possible to use Japanese Patent Laid-Open No. 2008-29148 or Japanese Patent Laid-Open No. 2008-43172 in the configuration or drive system of the variable flux motor. technology disclosed in the bulletin.

[0077] Next, a generator and a motor according to the embodiment will be described with reference to the drawings. Figure 4 It is a figure which shows the permanent magnet motor in this embodiment. exist Figure 4 In the shown permanent magnet motor 1 , a rotor 3 is arranged inside a stator 2 . The permanent magnet 5 which is the permanent magnet o...

Embodiment 1、 Embodiment 2

[0087] The raw materials used for the permanent magnet were weighed and mixed at a predetermined ratio, and then arc-dissolved in an Ar gas atmosphere to produce an alloy ingot. After the alloy ingot was heat-treated at 1175° C. for 8 hours, the alloy ingot was roughly pulverized and jet mill pulverized to prepare an alloy powder as a raw material powder of a magnet. The alloy powder is press-formed in a magnetic field to produce a compression-formed body.

[0088] Next, the compression molded body of the alloy powder was arranged in the sintering furnace chamber, and after the chamber was vacuumed, the temperature was raised to 1180° C. and held for 1 minute. After that, Ar gas was introduced, and the temperature was raised to 1195° C. in the Ar gas atmosphere. The temperature was maintained for 6 hours for formal sintering.

[0089] After the main sintering step, the sintered body was kept at 1160° C. for 8 hours to perform solution treatment. In addition, the cooling rate...

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Abstract

The present invention provides high-performance permanent magnets. This permanent magnet possesses: Composition represented by following composition formula: RpFeqMrCutCo100-p-q-r-t (wherein, R is at least one element selected from rare earth elements, and M is selected from Zr, Ti and At least one element selected from Hf, p is a number satisfying 10.5≦p≦12.5 atomic%, q is a number satisfying 23≦q≦40 atomic%, r is a number satisfying 0.88≦r≦4.5 atomic%, t In order to satisfy the number of 4.5≦t≦10.7 atomic %); and the following metal structure, the metal structure has a cell phase, the cell phase has a Th2Zn17 type crystal phase; a cell wall phase, the cell wall phase divides the Th2Zn17 type crystal phase M-rich flake phase, the M-rich flake phase is formed perpendicular to the c-axis of the Th2Zn17 crystal phase, and the concentration of M element is higher than that of the cell phase; and Cu-rich flake phase, the Cu-rich flake phase is along The M-rich sheet phase is formed, and the Cu concentration is higher than that of the cellular phase.

Description

technical field [0001] Embodiments of the invention relate to permanent magnets, electric motors and generators. Background technique [0002] As examples of high-performance rare earth magnets, Sm—Co magnets, Nd—Fe—B magnets, and the like are known. These magnets contribute to increasing the saturation magnetization of Fe or Co. In addition, since these magnets contain rare earth elements such as Nd or Sm, the actions of 4f electrons of the rare earth elements in the crystal field lead to large magnetic anisotropy. As a result, a large coercive force is obtained, and a high-performance magnet is realized. [0003] Such high-performance magnets are mainly used in electrical equipment such as motors, speakers, and measuring instruments. In recent years, due to the increasing demand for smaller, lighter, and lower power consumption of various electrical equipment, in order to respond to this, it is required to increase the maximum magnetic energy product (BHmax) of the perm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/055B22F3/00C22C1/04C22C19/07C22F1/10H01F1/08H02K1/27
CPCC22C19/07C22F1/10H02K1/02H02K1/276H02K1/2766H01F1/0596B22F2003/248C22C1/0433C22C2202/02C22C30/02C22C33/0278H01F1/055
Inventor 堀内阳介樱田新哉冈本佳子萩原将也小林刚史远藤将起小林忠彦
Owner KK TOSHIBA
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