US 12,454,978 B2
Magnetic bearing apparatus with axial pole segments
Yu Kakesu, Tokyo (JP); Kunihiko Tanaka, Tokyo (JP); and Toshimitsu Barada, Tokyo (JP)
Assigned to EBARA CORPORATION, Tokyo (JP)
Filed by EBARA CORPORATION, Tokyo (JP)
Filed on May 23, 2023, as Appl. No. 18/321,814.
Claims priority of application No. 2022-087642 (JP), filed on May 30, 2022.
Prior Publication US 2024/0084850 A1, Mar. 14, 2024
Int. Cl. F16C 32/04 (2006.01)
CPC F16C 32/0461 (2013.01) [F16C 32/0442 (2013.01); F16C 32/048 (2013.01); F16C 32/0457 (2013.01); F16C 32/047 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A magnetic bearing apparatus for supporting a rotating element in a non-contact manner, comprising:
a non-magnetic ring made of non-magnetic material; and
at least three axial magnetic poles arranged along a circumferential direction of the non-magnetic ring, the at least three axial magnetic poles having a plurality of arc-shaped coils and a plurality of coil housings that accommodate the plurality of coils therein, respectively, the at least three axial magnetic poles being fixed to the non-magnetic ring,
wherein the plurality of coil housings have a plurality of arc-shaped outer walls around which the plurality of arc-shaped coils are wound, respectively, and a plurality of arc-shaped inner walls arranged radially inwardly of the plurality of arc-shaped outer walls, respectively, and
wherein the plurality of arc-shaped inner walls are separated from each other, and gaps are formed between the plurality of arc-shaped inner walls,
wherein the plurality of coil housings have a plurality of arc-shaped base plates coupled to the plurality of arc-shaped outer walls and the plurality of arc-shaped inner walls,
wherein the plurality of arc-shaped base plates are separated from each other, and gaps are formed between the plurality of arc-shaped base plates, and
wherein the plurality of coil housings are fixed to the non-magnetic ring,
wherein the plurality of coil housings have a plurality of flanges protruding radially inwardly from the plurality of arc-shaped inner walls, the plurality of flanges are fixed to the non-magnetic ring, the plurality of flanges are separated from each other, and gaps are formed between the plurality of flanges.