Magnetic bearing apparatus with axial pole segments

Patent metadata

Field	Value
Publication number	US-12454978-B2
Application number	US-202318321814-A
Country	US
Kind code	B2
Filing date	May 23, 2023
Priority date	May 30, 2022
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

A magnetic bearing apparatus capable of correcting inclination of a rotating element with a small magnetic attractive force and capable of stably supporting the rotating element is disclosed. The magnetic bearing apparatus includes: 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. Each axial magnetic pole has an arc-shaped coil and a coil housing that accommodates the coil therein. The at least three axial magnetic poles are fixed to the non-magnetic ring.

First claim

What is claimed is:

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.

2. The magnetic bearing apparatus according to claim 1 , wherein electric wires are coupled to the plurality of coils and are arranged along the plurality of flanges.

3. The magnetic bearing apparatus according to claim 2 , wherein the non-magnetic ring has at least one recess in its inner periphery, and the electric wires extend through the recess.

4. The magnetic bearing apparatus according to claim 1 , further comprising positioning pins configured to fix a relative position between the non-magnetic ring and each axial magnetic pole.

5. The magnetic bearing apparatus of claim 1 , further comprising molding material covering coils of the at least three axial magnetic poles.

6. The magnetic bearing apparatus according to claim 1 , wherein an upper surface of each coil housing is a flat surface capable of making surface contact with a heat radiating member.

7. 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 configured to 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 inner walls around which the plurality of arc-shaped coils are wound, respectively, and a plurality of arc-shaped outer walls arranged radially outwardly of the arc-shaped inner walls, respectively,
wherein the plurality of arc-shaped outer walls are separated from each other and gaps are formed between the plurality of arc-shaped outer walls, 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 outwardly from the plurality of arc-shaped outer 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.

8. The magnetic bearing apparatus according to claim 7 , wherein electric wires are coupled to the plurality of coils and are arranged along the plurality of flanges.

9. The magnetic bearing apparatus of claim 8 , wherein the non-magnetic ring has at least one recess in its outer periphery, and the electric wires extend through the recess.

Assignees

• Ebara Corp

Inventors

• Kakesu Yu
• Tanaka Kunihiko
• Barada Toshimitsu

Classifications

• F16C32/048

  with active support of two degrees of freedom, e.g. radial magnetic bearings · CPC title

• F16C32/047 Primary

  Details of housings; Mounting of active magnetic bearings · CPC title

• F16C32/0457

  Details of the power supply to the electromagnets · CPC title

• F16C32/0442

  with devices affected by abnormal, undesired or non-standard conditions such as shock-load, power outage, start-up or touchdown · CPC title

• F16C32/0444

  Details of devices to control the actuation of the electromagnets · CPC title