公开(公告)号：US20190311827A1

公开(公告)日：2019-10-10

申请号：US16449737

申请日：2019-06-24

Applicant: ABB Schweiz AG

Inventor： Elio Perigo ,  Darren Tremelling ,  Jacim Jacimovic ,  Nikolaus Zant ,  Reinhand Simon ,  Lorenz Herrmann ,  Felix Greuter

IPC: H01F1/08 ,  H01F41/02 ,  H01F7/02 ,  H02K1/02

Abstract: A sintered magnet, the sintered magnet including a core portion, a shell portion arranged at an outer part of the sintered magnet, and a diffusion portion arranged at least partially between the core portion and the shell portion. The shell portion has a coercivity, which is at least 30 kA/m larger than the coercivity of the core portion. In the diffusion portion, the coercivity is not less than the coercivity of the core portion and not larger than the coercivity of the shell portion and the value of the coercivity gradually increases from the core portion towards the shell portion. The thickness of the core portion is not less than 1 mm and the total thickness of the shell portion and the diffusion portion is at least 5 mm.