公开(公告)号：US10530198B2

公开(公告)日：2020-01-07

申请号：US15258589

申请日：2016-09-07

申请人： TDK CORPORATION

发明人： Naoto Tsukamoto ,  Hiroshi Miyasaka ,  Makoto Iwasaki ,  Takahiro Kawashima ,  Chikara Ishizaka

IPC分类号： H02K1/02

摘要： An R-T-B based sintered magnet includes a first main surface and a first side surface. The first main surface has a coercivity that is higher than that of the first side surface. ΔHcjM≤60 kA/m is satisfied, where ΔHcjM is a difference in coercivity between a portion having a highest coercivity on the first main surface and a portion having a lowest coercivity on the first main surface. ΔHcjG≤60 kA/m is satisfied, where ΔHcjG is a difference in coercivity between a portion having a highest coercivity on a first cross section and a portion having a lowest coercivity on the first cross section and the first cross section is a cross section parallel to the first main surface and spaced from the first main surface at a predetermined length or more.