公开(公告)号：US20220385138A1

公开(公告)日：2022-12-01

申请号：US17791586

申请日：2020-02-20

Applicant: DANFOSS A/S

Inventor： Delvis Anibal GONZALEZ ,  Lin Xiang SUN

IPC: H02K7/09 ,  F25B31/02 ,  F16C32/04

Abstract: This disclosure relates to an axial magnetic bearing for a centrifugal refrigerant compressor, and a corresponding system and method. A centrifugal refrigerant compressor system according to an exemplary aspect of the present disclosure includes, among other things, an impeller connected to a shaft, and a magnetic bearing system supporting the shaft. The magnetic bearing system includes an axial magnetic bearing, which itself includes a first permanent magnet configured to generate a first bias flux, a second permanent magnet axially spaced-apart from the first permanent magnet and configured to generate a second bias flux, and an electromagnet. The electromagnet includes a coil arranged radially outward of the first and second permanent magnets, and the electromagnet is configured to selectively generate either a first control flux or a second control flux to apply a force to the shaft in a first axial direction or second axial direction opposite the first axial direction, respectively.

公开(公告)号：US20230081243A1

公开(公告)日：2023-03-16

申请号：US17792166

申请日：2020-06-30

Applicant: DANFOSS A/S

Inventor： Tianlei LI ,  Delvis Anibal GONZALEZ

IPC: H02K1/28 ,  F25B31/02

Abstract: An electric machine according to an exemplary aspect of the present disclosure includes, among other things, an electric machine including a rotor having a sleeve radially outside a permanent magnet. Further, the sleeve includes at least one magnetic arc segment and at least one non-magnetic arc segment.