# US 10,119,572 B2 · Electro-magnetic bearing assembly with inner ventilation to cool the bearing

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- Number: US 10,119,572 B2
- Document ID: US10119572B2
- Status: Granted
- Kind: B2
- Application number: 14/893,805
- Filed: 2014-05-23
- Published: 2016-04-14
- Granted: 2018-11-06
- Earliest claimed: 2013-05-27
- Assignees: Nuovo Pignone S.p.A.
- Applicants: Nuovo Pignone Srl
- Inventors: Andrea Massini; Luciano Mei; Manuele Bigi
- Web page: https://patentgrep.com/patent/US10119572B2

## CPC

- F16C 37/005: {of magnetic bearings}
- F16C 32/0468: {of moving parts of the magnetic circuit, e.g. of the rotor}
- F16C 32/0474: {for rotary movement}
- F16C 32/0476: {with active support of one degree of freedom, e.g. axial magnetic bearings}
- F16C 32/048: {with active support of two degrees of freedom, e.g. radial magnetic bearings}
- H02K 1/12: Stationary parts of the magnetic circuit
- H02K 7/09: with magnetic bearings
- F16C 32/047: {Details of housings; Mounting of active magnetic bearings}
- F16C 2360/00: Engines or pumps
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A magnetic bearing assembly for a rotary machine, having a rotor circuit and a stator magnetic circuit secured to a stationary support element having at least one body of ferromagnetic material and at least one coil, both being fitted in a protective annular housing leaving uncovered a surface of revolution of said ferromagnetic body and a surface of revolution of said one coil facing a surface of revolution of the rotor circuit. The bearing assembly comprises at least one row of blades secured on the rotor circuit.

## Claims

### Claim 1

A magnetic bearing assembly for a rotary machine comprising:
a rotor circuit;
a stator magnetic circuit secured to a stationary support element, and comprising two bodies of ferromagnetic material and at least one coil fitted in a protective annular housing leaving uncovered a surface of revolution of the two bodies of ferromagnetic material and a surface of revolution of the at least one coil facing a surface of revolution of the rotor circuit; and
at least one row of blades secured on the rotor circuit,
the rotor circuit comprises an annular thrust collar having an axial portion secured to a rotor shaft and radially extending towards the stator magnetic circuit by a radial portion, the radial portion facing the uncovered surfaces of the two bodies of ferromagnetic material and the at least one coil, each of the two bodies of ferromagnetic material face a radial lateral surface of the radial portion of the annular thrust collar, and each of the at least one row of blades is secured on the axial portion of the thrust collar and radially located between the annular thrust collar and the stator magnetic circuit.

### Claim 2 (depends on 1)

The magnetic bearing assembly according to claim 1, wherein the at least one row of blades comprises a plurality of blades extending from the rotor circuit.

### Claim 3 (depends on 1)

The magnetic bearing assembly according to claim 1, wherein the bearing is an axial magnetic bearing.

### Claim 4 (depends on 1)

The magnetic bearing assembly according to claim 1, wherein the at least one row of blades comprises a plurality of axial blades.

### Claim 5 (depends on 1)

The magnetic bearing assembly according to claim 1, wherein the at least one row of blades comprises a plurality of radial blades.

### Claim 6 (depends on 1)

The magnetic bearing assembly according to claim 1, wherein the at least one row of blades comprises a plurality of blades which shape is a combination of the radial and axial type.

### Claim 7 (depends on 1)

The magnetic bearing assembly according to claim 1, comprising two rows of blades.

### Claim 8 (depends on 1)

A turbo machine comprising a stator, a rotor mounted in rotation in the stator, and at least one magnetic bearing assembly according to claim 1 radially arranged between the rotor and the stator.