公开(公告)号：US20220172889A1

公开(公告)日：2022-06-02

申请号：US17434664

申请日：2020-02-21

Applicant: ABB Schweiz AG

Inventor： Jacim Jacimovic ,  Thomas Christen ,  Lavinia Scherf ,  Reto Kessler ,  Lorenz Herrmann ,  Eric Denervaud

IPC: H01F41/02 ,  B33Y70/00 ,  B33Y80/00 ,  H01F7/02

Abstract: A method of producing a permanent magnet includes forming a magnetisable workpiece by additive manufacturing and forming the permanent magnet by partitioning the magnetisable workpiece. The additive manufacturing includes steps of forming a first powder layer by depositing a first powder, the first powder being ferromagnetic; forming a first workpiece layer of the magnetisable workpiece by irradiating a predetermined first area of the first powder layer by means of a focused energy beam to fuse the first powder in the first area; and repeating the above steps multiple times to form further workpiece layers of the magnetisable workpiece. The permanent magnet is formed by partitioning the magnetisable workpiece, where an exposed surface of the permanent magnet formed by the partitioning is non-parallel to the first workpiece layer, and where the permanent magnet produces an external magnetic field having a magnetic field strength of at least 1 kA/m.

公开(公告)号：US20230307159A1

公开(公告)日：2023-09-28

申请号：US17639863

申请日：2020-09-03

Applicant: ABB Schweiz AG

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

IPC: H01F1/057 ,  H01F41/02 ,  H01F7/02 ,  H02K1/02

CPC classification number: H01F1/0577 ,  H01F41/0266 ,  H01F7/021 ,  H02K1/02

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.