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Permanent magnets, rotating electrical machines and vehicles
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A technology of permanent magnets and rotating motors, which is applied in the fields of permanent magnets, rotating motors and vehicles, and can solve problems such as reduction
Active Publication Date: 2019-12-17
KK TOSHIBA
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However, in the conventional manufacturing method, since the concentration of Fe is increased, the squareness ratio sometimes decreases.
Method used
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no. 1 approach
[0029] Next, the permanent magnet of this embodiment will be described.
[0030]
[0031] 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 The composition represented (in the formula, 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 %, q is satisfying 26≤q≤40 atomic %, r is a number satisfying 0.88≤r≤4.3 atomic %, t is a number satisfying 3.5≤t≤13.5 atomic %).
[0032] R in the above composition formula is an element capable of imparting large magnetic anisotropy to the magnet material. As the R element, at least one element selected from rare earth elements may, for example, be mentioned. Examples thereof include yttrium (Y), samarium (Sm), cerium (Ce), praseodymium (Pr), neodymium (Nd), and the like. One type of element R may be used, or a plurality of elements may be used. Particular preference i...
no. 2 approach
[0091] The permanent magnet of the first embodiment can be used in various electric motors, generators and other rotating electric machines equipped in vehicles such as automobiles and railway vehicles. In addition, it can also be used as a fixed magnet and a variable magnet for variable flux motors and variable flux generators. By using the permanent magnet of the first embodiment, various motors and generators can be configured. When the permanent magnet of the first embodiment is applied to a variable magnetic flux motor, for example, Japanese Patent Application Laid-Open No. 2008-29148 or Japanese Patent Laid-Open No. 2008-43172 can be applied to the structure and drive system of the variable flux motor. technology disclosed in .
[0092] Next, a rotating electric machine having the permanent magnet described above will be described with reference to the drawings. Figure 7 It is a figure which shows the permanent magnet motor of this embodiment. Figure 7 In the illust...
Embodiment 1、 Embodiment 2
[0102] Each raw material used for the permanent magnet is weighed and mixed in a predetermined ratio, and then arc-melted in an Ar gas atmosphere to form an alloy ingot. After the alloy ingot was heat-treated by holding at 1170° C. for 10 hours, the alloy ingot was coarsely pulverized and pulverized by a jet mill to produce 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.
[0103]Next, the compression molded body of the alloy powder is arranged in the sintering furnace chamber so that the chamber is 8.0×10 -3 After the vacuum state of Pa, the temperature was raised to 1170° C. and kept at the reached temperature for 15 minutes. Then, Ar gas was introduced, the temperature was raised to 1200° C. in the Ar atmosphere, and the temperature was maintained at the reached temperature for 6 hours to perform high-quality treatment. Next, it was cooled to 1185° C., and held at the rea...
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Abstract
The invention provides a high-performance permanent magnet. The permanent magnet has the composition formula: R p Fe q m r Cu t co 100‑p‑q‑r‑t The composition represented by has a metallic structure including a main phase and a grain boundary phase, the main phase having Th 2 Zn 17 type crystal phase, the grain boundary phase is provided between crystal grains constituting the main phase. The main phase includes a cellular phase and a Cu-rich phase, the cellular phase has Th 2 Zn 17 type crystalline phase, the Cu-rich phase is arranged to separate the cell phase and contains a higher concentration of Cu than the cell phase. The difference between the Cu concentration of the first region and the Cu concentration of the second region is 0.5 atomic % or less, the first region including Th 2 Zn 17 In the section of the c-axis of the type crystal phase, the cell phase separated by the Cu-rich phase in the crystal grain is formed, and the second region is located in the same crystal grain as the first region, and is located at the grain boundary phase of the cross section. The distance from the grain boundary phase in the direction perpendicular to the extending direction is within a range of 50 nm to 200 nm.
Description
technical field [0001] The present invention relates to a permanent magnet, a rotating electric machine and a vehicle. 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. Among 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 the large magnetic anisotropy is brought about by the behavior of 4f electrons of the rare earth elements in the crystal field. Thereby, a large coercive force can be obtained, and a high-performance magnet can be realized. [0003] This high-performance magnet is mainly used in electrical appliances such as motors, speakers, and measuring instruments. In recent years, there has been an increasing demand for downsizing, weight reduction, and low power consumption of various electric appliances. In response to this demand, the development of highe...
Claims
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