Permanent magnet, and motor and power generator using the same
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United States of America Patent
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May 22, 2014
app pub date -
Nov 11, 2013
filing date -
Nov 20, 2012
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Abstract
In one embodiment, a permanent magnet includes: a composition expressed by RpFeqMrCusCo100-p-q-r-s (R is a rare-earth element, M is at least one element selected from Zr, Ti, and Hf, 10≤p≤13.5 at %, 25≤q≤40 at %, 1.35≤r≤1.75 at %, and 0.88≤s≤13.5 at %); and a metallic structure including Th2Zn17 crystal phases each having a Fe concentration of 25 at % or more, and Cu-rich crystal phases each having a Cu concentration of from 25 at % to 70 at %. An average thickness of the Cu-rich crystal phases is 20 nm or less, and an average distance between the Cu-rich crystal phases is 200 nm or less.
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