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permanent magnets and electric motors

A technology of permanent magnets and motors, applied in circuits, magnetic objects, magnetic materials, etc., can solve problems such as lack of stability in supply and price, lack of resources, uneven distribution, etc.

Active Publication Date: 2018-01-02
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the resources of heavy rare earth elements such as Dy and Tb are scarce and unevenly distributed, so they lack stability in terms of supply and price

Method used

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  • permanent magnets and electric motors
  • permanent magnets and electric motors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Except that the composition of the grain boundary phase alloy is Ce 13.5at%-Nd 25.5at%-Fe 48.7at%-Co10.3at%-Cu 1.0at%-Al 1.0at%, the rest were produced in the same manner as in Comparative Example 1 Alloy sheets and crushed. After measuring the particle size of the obtained fine powder with a particle size distribution meter, it was confirmed that the D50 value was 3.6 μm.

[0070] Next, a molded body was prepared in the same manner as in Comparative Example 2, and fired and aged to obtain a sintered body.

[0071] Then, Br and HcJ were obtained from the measurement results of the B-H tracer in the same manner as in Comparative Example 1. The main phase of the obtained sintered body was confirmed to be tetragonal R 2 T 14 B structure. From the results of FE-SEM and EDS, it was confirmed that Ce-rich grain boundary phases and Nd-rich grain boundary phases existed in addition to the main phase, and the Ce concentration x in the grain boundary phases was obtained. Sin...

Embodiment 2

[0073] Except that the composition of the grain boundary phase alloy is Ce 23.2at%-Nd 27.7at%-Fe 36.8at%-Co10.3at%-Cu 1.0at%-Al 1.0at%, the rest were produced in the same manner as in Comparative Example 1 Alloy sheets and crushed. After measuring the particle size of the obtained fine powder with a particle size distribution meter, it was confirmed that the D50 value was 3.5 μm.

[0074] Next, a molded body was prepared in the same manner as in Comparative Example 2, and fired and aged to obtain a sintered body.

[0075] Then, Br and HcJ were obtained from the measurement results of the B-H tracer in the same manner as in Comparative Example 1. The main phase of the obtained sintered body was confirmed to be tetragonal R 2 T 14 B structure. From the results of FE-SEM and EDS, it was confirmed that Ce-rich grain boundary phases and Nd-rich grain boundary phases existed in addition to the main phase, and x, Fgb, and Atre were obtained in the same manner as in Example 1. Th...

Embodiment 3

[0077] Alloy thin plates were prepared and pulverized in the same manner as in Comparative Example 1, except that the composition of the grain boundary phase alloy was Ce 54.5at%-Fe 33.2at%-Co 10.3at%-Cu1.0at%-Al 1.0at%. After measuring the particle size of the obtained fine powder with a particle size distribution meter, it was confirmed that the D50 value was 3.5 μm.

[0078] Next, a molded body was prepared in the same manner as in Comparative Example 2, and fired and aged to obtain a sintered body.

[0079] Then, Br and HcJ were obtained from the measurement results of the B-H tracer in the same manner as in Comparative Example 1. The main phase of the obtained sintered body was confirmed to be tetragonal R 2 T 14 B structure. From the results of FE-SEM and EDS, it was confirmed that Ce-rich grain boundary phases existed in addition to the main phase, and the Ce concentration x in the grain boundary phases was obtained. After that, Fgb and Atre are obtained. The resul...

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Abstract

The present invention does not use heavy rare earths and forms a grain boundary phase containing a large amount of Ce, thereby providing an R-T-B system permanent magnet having a sufficiently high coercive force and having the R-T-B system with abundant and inexpensive materials. T‑B series permanent magnet motors. The permanent magnet provided by the present invention is characterized in that it contains a main phase composed of R2T14B structure (R is at least one element in Y, La, Ce, Pr, Nd, Sm, Eu, Gd, and T is necessarily Fe. Or with Fe and Co as one or more necessary transition metal elements), and by CexM1-x (M is Mg, Al, Si, Ti, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Y , Zr, Nb, Mo, Ag, In, Sn, La, Pr, Nd, Sm, Eu, Gd, Hf, Ta, W, Bi at least one element, x is 0.20≤x≤0.55) boundary phase, and the cross-sectional area ratio Atre of the grain boundary phase relative to the entire magnet structure is 0.03<Atre<0.07.

Description

technical field [0001] The present invention relates to a permanent magnet with high coercive force and a motor using the same. Background technique [0002] Conventionally, alnico magnets, ferrite magnets, Sm-Co magnets, Nd-Fe-B magnets, etc. For key components of various electrical equipment such as speakers and medical MRIs, appropriate magnets are used for each. Among these magnets, rare earth magnets such as Sm-Co magnets and Nd-Fe-B magnets contain a large amount of Fe or Co; and rare earth elements. Fe, Co contribute to the increase of the saturation magnetic flux density (Br), and in addition, because the rare earth elements bring about a very large magnetic anisotropy from the movement of 4f electrons in the crystal field, they contribute to the coercive force (HcJ ) increases and achieves good magnetic properties. [0003] In recent years, the demand for miniaturization and energy saving of various electrical equipment has been increasing, and it is required to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/00
CPCH01F1/0577C22C33/0278C22C2202/02C22C38/002C22C38/005C22C28/00C22C30/02H02K1/02
Inventor 田中大介榎户靖
Owner TDK CORPARATION
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