公开(公告)号：US20240047112A1

公开(公告)日：2024-02-08

申请号：US18366601

申请日：2023-08-07

Applicant: NICHIA CORPORATION

Inventor： Rie YOSHIDA ,  Daichi ITAMI ,  Masahiro ABE ,  Kuniyasu KAWAMURA ,  Takayuki YANO ,  Muneo YAMAMOTO

IPC: H01F7/02 ,  H01F1/059

CPC classification number: H01F7/021 ,  H01F1/059

Abstract: A cylindrical multipole magnet having an inner peripheral surface and an outer peripheral surface and having N- and S-poles alternately and continuously in a circumferential direction. A surface magnetic flux density of the outer peripheral surface is at least 0.2 times a surface magnetic flux density of the inner peripheral surface. The cylindrical multipole magnet contains an anisotropic rare earth magnetic powder and a resin, with a filling ratio of the anisotropic rare earth magnetic powder being at least 50 vol % but not higher than 65 vol % with respect to a total volume of the anisotropic rare earth magnetic powder and the resin.