公开(公告)号：US11170923B2

公开(公告)日：2021-11-09

申请号：US16830942

申请日：2020-03-26

Applicant: TDK Corporation

Inventor： Nobuo Takagi ,  Yousuke Hitomi

IPC: H01F7/02 ,  H02K15/03 ,  H02K1/27

Abstract: A magnet structure, comprises: a plurality of permanent magnet members; and an adhesive layer bonding the permanent magnet members to each other, wherein the adhesive layer contains an adhesive, and a plurality of gap members, the gap members have insulation properties, each surface S of the permanent magnet members in contact with the adhesive layer has a plurality of convex parts, a reference plane is a plane including a mean line of a roughness curve of the surface S, Ry is a maximum value of heights of the convex parts from a deepest part of the surface S in a direction perpendicular to the reference plane, Rv is a distance between the reference plane and the deepest part, Rp is Ry−Rv, W1 is a width of the gap member in a direction perpendicular to the reference plane, and W1 is larger than 2Rp.

公开(公告)号：US11081270B2

公开(公告)日：2021-08-03

申请号：US16389137

申请日：2019-04-19

Applicant: TDK Corporation

Inventor： Nobuo Takagi ,  Yousuke Hitomi

IPC: H01F7/02 ,  H02K15/12 ,  H02K15/03 ,  H02K1/27 ,  C09J5/06 ,  C09J5/08

Abstract: A permanent magnet includes a magnet member, and an adhesive layer covering a surface of the magnet member, wherein the adhesive layer includes a resin and a plurality of foaming agents, and wherein at least part of the foaming agents protrudes from a surface of the resin.