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Permanent magnets and rotating electrical machines

A permanent magnet, atomic technology, applied in the direction of magnetic circuit rotating parts, inductance/transformer/magnet manufacturing, magnetic circuit, etc., can solve problems such as reduction of squareness ratio

Active Publication Date: 2019-07-05
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the conventional manufacturing method, the squareness ratio may decrease due to increasing the Fe concentration.

Method used

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  • Permanent magnets and rotating electrical machines
  • Permanent magnets and rotating electrical machines
  • Permanent magnets and rotating electrical machines

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0020] The permanent magnet of this embodiment will be described below.

[0021]

[0022] The permanent magnet of the present embodiment has composition formula: R p Fe q m r Cu t co 100-p-q-r-t (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≤12.4 atomic %, and q is satisfying 28 ≤q≤40 atomic %, r is a number satisfying 0.88≤r≤4.3 atomic %, and t is a number satisfying 3.5≤t≤13.5 atomic %).

[0023] R in the above composition formula is an element that can provide a large magnetic anisotropy to the magnet material. The R element may, for example, be at least one element selected from rare earth elements such as yttrium (Y), samarium (Sm), cerium (Ce), praseodymium (Pr), and neodymium (Nd). Particular preference is given to using Sm. For example, when a plurality of elements including Sm are used as the R element, the performance of the magnet material, such a...

no. 2 approach

[0082] The permanent magnet of the first embodiment can be used in rotating electric machines such as various electric motors and 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 the first embodiment, various motors or generators are configured. In the case where the permanent magnet of the first embodiment is used in a variable magnetic flux motor, for example, Japanese Patent Laid-Open No. 2008-29148 or Japanese Patent Laid-Open No. 2008-43172 can be used in the configuration or drive system of the variable magnetic flux motor. technology disclosed in the bulletin.

[0083] Next, a rotating electrical machine having the permanent magnet described above will be described with reference to the drawings. Figure 5 It is a figure which shows the permanent magnet motor in this embodiment. Figure 5 In the illustrated permanent magnet moto...

Embodiment 1、 Embodiment 2

[0093] The raw materials used in the permanent magnet are weighed and mixed according to a prescribed ratio, and then arc-melted in an Ar gas atmosphere to produce an alloy ingot. After the above-mentioned alloy ingot was heat-treated at 1170° C. for 12 hours, the alloy ingot was roughly pulverized and pulverized by a jet mill to prepare an alloy powder as a raw material powder of a magnet. The obtained alloy powder was press-formed in a magnetic field to produce a compression-formed body.

[0094] Next, the compression-molded body of the alloy powder was arranged in the sintering furnace chamber, and after the chamber was made into a vacuum state, the temperature was raised to 1170° C. and kept at the reached temperature for 15 minutes. Thereafter, Ar gas was introduced, the temperature was raised to 1200° C. in an Ar atmosphere, and sintering was performed by maintaining at the reached temperature for 3 hours. Next, it cooled to 1170 degreeC, and performed high-quality proc...

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Abstract

The present invention provides high-performance permanent magnets. The permanent magnet has the composition formula: R p Fe q m r Cu t co 100‑p‑q‑r‑t Composition and metal structure represented, the metal structure contains Th 2 Zn 17 The unit cell phase of the type crystalline phase, and is set in a manner separated from the unit cell phase, has a ratio Th 2 Zn 17 A Cu-rich phase with a high Cu concentration in the crystalline phase. Th 2 Zn 17 The Fe concentration of the type crystal phase is not less than 30 atomic % and not more than 45 atomic %. The average length of the Cu-rich phase is not less than 30 nm and not more than 250 nm.

Description

technical field [0001] Embodiments of the present invention relate to permanent magnets and rotating electric machines. 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, these magnets contain rare earth elements such as Nd and Sm, and provide large magnetic anisotropy derived from the behavior of 4f electrons of the rare earth elements in the crystallization field. 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 order to cope with the recent increase in the size, weight, and power consumption of various electrical equipment, higher-performance permanent magnets having an increased maximum energy pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/055B22F1/00B22F3/00C22C19/07H01F1/08H02K1/27B22F1/05
CPCC22C19/07H02K1/27H02K1/276H02K1/2766H01F1/0557H01F1/0596B22F2998/10B22F2999/00C22C2200/02B22F9/04B22F1/05B22F3/02B22F2202/05B22F3/10B22F2003/248B22F3/1028B22F2009/043H01F1/053H01F41/0266H02K1/02
Inventor 堀内阳介樱田新哉真田直幸
Owner KK TOSHIBA
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