# US 5,705,869 A · Magnetic axial thrust bearings fabricated on individual stator segments

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- Number: US 5,705,869 A
- Document ID: US5705869A
- Status: Granted
- Kind: A
- Application number: 08/493,022
- Filed: 1995-06-21
- Granted: 1998-01-06
- Earliest claimed: 1995-06-21
- Assignees: General Electric Company
- Inventors: Gerald Burt Kliman; Mark Alan Preston
- Web page: https://patentgrep.com/patent/US5705869A

## CPC

- F16C 32/0459: {Details of the magnetic circuit}
- F16C 32/0476: {with active support of one degree of freedom, e.g. axial magnetic bearings}
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

An axial magnetic thrust bearing stator includes a plurality of laminated cores. Each of the cores is magnetically conductive, situated in a common plane, and symmetrically situated about a center of rotation. A plurality of electrically conductive coils are provided with each coil situated at least partially in a respective one of the cores.

## Claims

### Claim 1

An axial magnetic thrust bearing stator comprising:
a plurality of laminated bearing stator cores, each of the bearing stator cores comprising a block and being magnetically conductive, situated in a common plane, and symmetrically situated about a center of rotation;
a plurality of bearing stator coils, each bearing stator coil being electrically conductive and situated at least partially in a respective one of the plurality of bearing stator cores; and
a plurality of magnetic wedges, each magnetic wedge being situated between a respective pair of bearing stator cores.

### Claim 2

An axial magnetic thrust bearing stator comprising:
a plurality of laminated cores, each of the cores being magnetically conductive, situated in a common plane, and symmetrically situated about a center of rotation; and
a plurality of coils, each coil being electrically conductive and situated at least partially in a respective one of the plurality of cores,
each core including a respective surface with a pair of slots extending toward the center of rotation, a respective coil being situated at least partially in the slots, each respective surface being situated on a common plane.

### Claim 3

An axial magnetic thrust bearing stator comprising:
a plurality of laminated cores, each of the cores being magnetically conductive, situated in a common plane, and symmetrically situated about a center of rotation; and
a plurality of coils, each coil being electrically conductive and situated at least partially in a respective one of the plurality of cores,
each core comprising a middle portion between first and second larger portions, a respective coil being situated around the middle portion, the first larger portion having a surface facing toward the center of rotation, the second larger portion having a surface facing away from the center of rotation.

### Claim 4 (depends on 3)

The stator of claim 3, further including a flux barrier between at least one pair of adjacent cores.

### Claim 5

An axial magnetic thrust bearing stator comprising:
a plurality of laminated bearing stator cores, each of the bearing stator cores being magnetically conductive, situated in a common plane, and symmetrically situated about a center of rotation;
a plurality of bearing stator coils, each bearing stator coil being electrically conductive and situated at least partially in a respective one of the plurality of bearing stator cores,
each bearing stator core including a surface with a raised portion, a respective bearing stator coil being wrapped around the raised portion, each respective surface being situated on a common plane; and
a flux barrier between at least one pair of bearing stator cores.