公开(公告)号：EP3789137A1

公开(公告)日：2021-03-10

申请号：EP19195644.0

申请日：2019-09-05

Applicant: ABB Schweiz AG

Inventor： Scherf, Lavinia Maria ,  Jacimovic, Jacim ,  Kessler, Reto ,  Tremelling, Darren ,  Shrestha, Ghanshyam

IPC: B22F5/00 ,  B22F7/06 ,  B33Y80/00 ,  B22F3/02 ,  B22F3/10 ,  B22F9/02 ,  B22F3/105 ,  B22F9/04 ,  H01F1/055 ,  H01F1/057 ,  H01F1/09 ,  H01F41/02 ,  C22C1/05

Abstract: The present invention relates to high-resistivity permanent magnets, their preparation and their application in electrical machines. A permanent magnet according to the present invention comprises a permanent magnet comprising a magnetic material and a shaped inorganic insulating element, wherein a shape and a size of the shaped inorganic insulating element have been substantially unchanged by the sintering, wherein the shaped inorganic insulating element has a width and a length which are both at least 10 times larger than an average grain diameter of the magnetic material after sintering, and wherein an arithmetic average waviness Wa of an interface between the magnetic material and the shaped inorganic insulating element is less than 10% of a local wall thickness of the shaped inorganic insulating element after sintering.