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:
Oct. 24, 2023
Filed:
Jan. 29, 2019
Tdk Corporation, Tokyo, JP;
Keiji Takeda, Tokyo, JP;
Shota Miyazaki, Tokyo, JP;
TDK CORPORATION, Tokyo, JP;
Abstract
An R-T-B-based rare earth permanent magnet in which the composition formula is represented by (R1SmR2)TBM, wherein: R1 is one or more rare earth elements not including Sm and Y; R2 is one or more rare earth elements from among Y, Ce, and La; T is Fe, etc.; M is Ga, etc.; x and y are in the region indicated in FIG.; the relationships 0.16≤a/b≤0.28, 0.050≤c/b≤0.075, and 0.005≤d/b≤0.028 are satisfied; the R-T-B-based rare earth permanent magnet includes a grain boundary phase and a main phase comprising an RTB compound; the average crystal grain diameter of the main-phase crystal grains is D50≤4.00 μm; the granularity distribution is (D90−D10)/D50≤1.60; and the coverage of the grain boundary phase is at least 70.0%.