R-T-B based permanent magnet

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United States of America Patent

PATENT NO 9953751
SERIAL NO

14385855

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Abstract

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A R-T-B based permanent magnet which not only has equivalent magnetic properties as the existing Nd—Fe—B based permanent magnet as well as light mass but also can be suitably used as a magnet for field system of a permanent magnet synchronous rotating machine. The magnet can be obtained in a case where the composition of the compound for forming the main phase is (R1-x(Y1-zLaz)x)2T14B (R is rare earth element(s) consisting of one or more elements of Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, T is one or more transition metal elements with Fe or Fe and Co as essential elements, 0.04f/(Y4f+Y4g) satisfies 0.8≤Y4f/(Y4f+Y4g)≤1.0 when the Y occupying the 4f site of the tetragonal R2T14B structure is denoted as Y4f and the Y occupying the 4g site is denoted as Y4g.

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Patent Owner(s)

Patent OwnerAddress
TDK CORPORATIONTOKYO 103-6128

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hashimoto, Ryuji Tokyo, JP 70 362
Suzuki, Kenichi Tokyo, JP 402 3766
Umeda, Yuji Tokyo, JP 23 117

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