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1. (WO2018181592) PERMANENT MAGNET AND ROTATING MACHINE

Pub. No.:    WO/2018/181592    International Application No.:    PCT/JP2018/012997
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Thu Mar 29 01:59:59 CEST 2018
IPC: H01F 1/057
B22F 3/00
C22C 33/02
C22C 38/00
Applicants: TDK CORPORATION
TDK株式会社
Inventors: KODA Atsushi
古田 敦
SUWA Takahiro
諏訪 孝裕
JINGU Nobuhiro
神宮 信宏
Title: PERMANENT MAGNET AND ROTATING MACHINE
Abstract:
Provided are a permanent magnet having high coercive force and high squareness ratio among permanent magnets including Ce as an alternative element for Nd, and a rotating machine provided with the permanent magnet. The permanent magnet contains a rare-earth element R, a transition metal element T, and boron B, wherein: the rare-earth element R includes at least Nd, Y, and Ce; the transition metal element T includes at least Fe; a total content of the rare-earth element R in the permanent magnet is [R] at%; a total content of the transition metal element T in the permanent magnet is [T] at%; the content of B in the permanent magnet is [B] at%; the content of Y in the permanent magnet is [Y] at%; the content of Ce in the permanent magnet is [Ce] at%; [Y]/[R] is 0.05 to 0.25; [Ce]/[R] is 0.10 to 0.55; and [T]/[B] is 14 to 18.