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Magnet powders, bonded magnets, and electric motors

A technology of bonding magnets and motors, applied in the field of magnet powder, to achieve high coercive force and reduce the deterioration of magnetic properties

Active Publication Date: 2017-10-31
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the performance is inferior to that of sintered magnets, it can be applied to motors of electronic equipment or various sensors due to the large degree of freedom in shape and good dimensional accuracy.

Method used

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  • Magnet powders, bonded magnets, and electric motors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A quenched ribbon was produced in the same manner as in Comparative Example 1, except that R in the raw material composition was set to R1=Nd and R2=Ho, and R2 / (R1+R2)=0.05 in atomic ratio. Then, the average primary particle diameter and the deviation Ra were obtained from the results of FE-SEM in the same manner as in Comparative Example 1. After pulverizing the quenched ribbon, the oxygen content was measured in the same manner as in Comparative Example 1, and HcJ and Br were obtained from the VSM measurement results. The results are shown in Table 1.

Embodiment 2

[0046] A quenched ribbon was produced in the same manner as in Comparative Example 1, except that R in the raw material composition was set to R1=Nd and R2=Ho, and R2 / (R1+R2)=0.1 in atomic ratio. Then, the average primary particle diameter and the deviation Ra were obtained from the results of FE-SEM in the same manner as in Comparative Example 1. After pulverizing the quenched ribbon, the oxygen content was measured in the same manner as in Comparative Example 1, and HcJ and Br were obtained from the VSM measurement results. The results are shown in Table 1.

Embodiment 3

[0062] A quenched ribbon was produced in the same manner as in Example 1 except that the raw material composition was set to 21at%R-69at%Fe-10at%B. Then, the average primary particle diameter and the deviation Ra were obtained from the results of FE-SEM in the same manner as in Comparative Example 1. After pulverizing the quenched ribbon, the oxygen content was measured in the same manner as in Comparative Example 1, and HcJ and Br were obtained from the VSM measurement results. The results are shown in Table 1.

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PUM

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Abstract

A magnet powder having a composition composed of R (R consists of R1 and R2, R1 represents at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Er, Tm, Yb and Lu, R2 represents at least one rare earth element selected from the group consisting of Ho and Gd). T (T represents at least one transition metal element containing Fe or the combination of Fe and Co as essential element(s)) and B, wherein, the atomic ratio of R2 / (R1×R2) is 0.05 to 0.1, the ratio of R / T is 0.25 to 0.35, and the magnet powder has an average primary particle size of 45 to 100 nm. The present invention also provides a bond magnet using the magnet powder.

Description

technical field [0001] The present invention relates to a magnet powder, a bonded magnet using the magnet powder, and a motor using the bond magnet. Background technique [0002] Bonded magnets are permanent magnets in which magnet powder and resin are mixed and solidified by extrusion, compression or injection. Although its performance is inferior to that of sintered magnets, it can be applied to motors of electronic equipment and various sensors due to its large degree of freedom in shape and good dimensional accuracy. In particular, rare-earth bonded magnets (bond magnets) utilizing the excellent magnetic properties of rare-earth alloys have attracted attention recently. As known rare earth permanent magnet materials, for example, a Sm—Co based magnet material disclosed in Patent Document 1 and a Nd—Fe—B based magnet material disclosed in Patent Document 2 are known. Nd-Fe-B-based materials are more widely used than Sm-Co-based materials due to reasons such as reserves ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08H02K1/02
CPCH01F1/0578
Inventor 田中大介榎户靖
Owner TDK CORPARATION
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