Permanent magnet, motor, and generator

A permanent magnet and atomic technology, applied in the field of electric motors and generators, permanent magnets, can solve the problem of square ratio reduction and other problems

Active Publication Date: 2015-12-02
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High concentration of Fe is considered to be effective for high magnetization of Sm-Co magnets, but in conventional manufacturing methods, squareness ratio tends to decrease due to high concentration of Fe

Method used

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  • Permanent magnet, motor, and generator
  • Permanent magnet, motor, and generator
  • Permanent magnet, motor, and generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0017] The permanent magnet of this embodiment will be described below.

[0018]

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

[0020] (wherein, R is at least one element selected from rare earth elements, M is at least one element selected from the group consisting of Zr, Ti, and Hf, and p satisfies 10.5≤p≤12.5 atoms %, q is a number satisfying 23≤q≤40 atomic %, r is a number satisfying 0.88≤r≤4.5 atomic %, t is a number satisfying 3.5≤t≤10.7 atomic %).

[0021] R in the above composition formula is an element that can make the magnet material have a large magnetic anisotropy. As the R element, for example, one or several elements selected from rare earth elements including yttrium (Y), such as samarium (Sm), cerium (Ce), neodymium (Nd), praseodymium (Pr ) etc., it is particularly preferable to use Sm. For example, when using a plurality of elements including Sm ...

Embodiment approach 2

[0073]The permanent magnet of Embodiment 1 can be used for various motors or generators. In addition, it can also be used as a fixed magnet or a variable magnet of a variable magnetic flux motor or a variable magnetic flux generator. By using the permanent magnet of Embodiment 1, various electric motors and generators are configured. In the case where the permanent magnet of Embodiment 1 is applied to a variable flux motor, Japanese Patent Laid-Open No. 2008-29148 or Japanese Patent Laid-Open No. 2008- The technology disclosed in the No. 43172 bulletin.

[0074] Next, a motor and a generator according to the present embodiment will be described with reference to the drawings. image 3 It is a figure which shows the permanent magnet motor in this embodiment. exist image 3 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 of Embodiment 1 is arrange|positioned in the iron core 4 of the roto...

Embodiment 1、 Embodiment 2

[0084] After weighing and mixing each raw material for a permanent magnet at a predetermined ratio, arc melting was performed in an Ar gas atmosphere to produce an alloy ingot. The alloy ingot was heat-treated by holding at 1180° C. for 12 hours, and then the alloy ingot was coarsely pulverized and pulverized by a jet mill to prepare alloy powder as a raw material powder of a magnet. The obtained alloy powder is press-formed in a magnetic field to produce a compression-formed body.

[0085] Next, arrange the compression molded body of the alloy powder in the cavity of the sintering furnace. After forming a vacuum state in the cavity, the temperature is raised to 1170° C. and kept at the reached temperature for 20 minutes. Then, Ar gas is introduced, and the temperature is raised to 1200° C., maintaining at the reached temperature for 6 hours, thereby performing sintering. Next, the sintered body was held at 1165° C. for 12 hours to perform solution treatment, and then cooled....

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Abstract

A high performance permanent magnet is provided. The permanent magnet includes a composition represented by a composition formula: RpFeqMrCutCo100-p-q-t, and a metallic structure including cell phases having a Th2Zn17 crystal phase and Cu-rich phases having higher Cu concentration than the cell phases. An average diameter of the cell phases is 220 nm or less, and in a numeric value range from a minimum diameter to a maximum diameter of the cell phases, a ratio of a number of cell phases having a diameter in a numeric value range of less than upper 20% from the maximum diameter is 20% or less of all the cell phases.

Description

technical field [0001] The invention of the embodiment relates to a permanent magnet, a motor, and a generator. Background technique [0002] As examples of high-performance rare-earth magnets, Sm-Co-based magnets, Nd-Fe-B-based magnets, and the like are known. In these magnets, Fe and Co contribute to the increase of saturation magnetization. In addition, rare earth elements such as Nd and Sm are contained in these magnets, and the movement of 4f electrons of the rare earth elements in the crystal field causes large magnetic anisotropy. Thereby, a large coercive force can be obtained, and a high-performance magnet can be realized. [0003] Such high-performance magnets are mainly used in electrical equipment such as motors, speakers, and measuring instruments. In recent years, various electrical equipment have been required to be smaller, lighter, and lower in power consumption. In response to this, it is required to increase the maximum energy product (BH) of permanent ...

Claims

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Application Information

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IPC IPC(8): H01F1/055B22F3/00B22F3/24C22C19/07C22C30/02C22F1/00C22F1/18H01F1/08
CPCH01F1/055C22C19/07C22C30/02H01F1/0557H02K1/02C22C1/0441B22F9/08B22F2009/041B22F2009/043B22F2009/044B22F2009/048B22F2998/10B22F2999/00H01F1/0551H01F7/0226B22F9/04B22F3/02B22F3/1017B22F3/1028B22F2003/248B22F2202/05
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真田直幸
Owner KK TOSHIBA
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