The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 2015
Filed:
May. 25, 2012
Tetsuya Hidaka, Tokyo, JP;
Kazuo Sato, Tokyo, JP;
Kazuya Sakamoto, Tokyo, JP;
Shinya Fujito, Tokyou, JP;
Motoaki Hosako, Tokyo, JP;
Motohisa Murata, Tokyo, JP;
Koji Mitake, Tokyo, JP;
Tetsuya Hidaka, Tokyo, JP;
Kazuo Sato, Tokyo, JP;
Kazuya Sakamoto, Tokyo, JP;
Shinya Fujito, Tokyou, JP;
Motoaki Hosako, Tokyo, JP;
Motohisa Murata, Tokyo, JP;
Koji Mitake, Tokyo, JP;
TDK CORPORATION, Tokyo, JP;
Abstract
A sintered rare earth magnet rotating machine and method improve temperature properties and strength having an excellent corrosion resistance. The sintered rare earth magnet includes at least a main phase composed of RTB (R represents at least one rare earth element of Nd, Pr or both and T represents at least one transition metal element including Fe or Fe and Co) compound and a grain boundary phase containing a higher proportion of R than the main phase, wherein the main phase includes a heavy rare earth element (one of Dy, Tb or both), at least part of main phase grains of the main phase included in the sintered rare earth magnet includes at least the following regions, low, high and intermediate concentration regions. These regions exist in order of low, high, and intermediate concentration regions, from low concentration region towards the grain boundary phase in the main phase grains.