公开(公告)号：US20170076846A1

公开(公告)日：2017-03-16

申请号：US15258589

申请日：2016-09-07

Applicant: TDK CORPORATION

Inventor： Naoto TSUKAMOTO ,  Hiroshi MIYASAKA ,  Makoto IWASAKI ,  Takahiro KAWASHIMA ,  Chikara ISHIZAKA

IPC: H01F7/02 ,  H02K1/02

Abstract: 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.

Abstract translation: R-T-B系烧结磁体包括第一主表面和第一侧表面。 第一主表面的矫顽力高于第一侧表面的矫顽力。 ΔHcjM≤60kA/ m，其中ΔHcjM是第一主表面具有最高矫顽力的部分与第一主表面具有最低矫顽力的部分之间的矫顽力差。 ΔHcjG≤60kA/ m，其中ΔHcjG是在第一横截面上具有最高矫顽力的部分与第一横截面具有最低矫顽力的部分之间的矫顽力的差异与第一横截面是横截面平行 到第一主表面并且以预定长度或更长的距离与第一主表面间隔开。