# US 8,148,861 B2 · Canned or sleeved rotary machine and method of manufacturing it

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- Number: US 8,148,861 B2
- Document ID: US8148861B2
- Status: Granted
- Kind: B2
- Application number: 12/537,593
- Filed: 2009-08-07
- Published: 2011-01-06
- Granted: 2012-04-03
- Earliest claimed: 2009-07-03
- Assignees: Societe de Mecanique Magnetique
- Inventors: Luc Baudelocque; David Moulin
- Web page: https://patentgrep.com/patent/US8148861B2

## CPC

- F04D 29/023: {especially adapted for elastic fluid pumps}
- F04D 29/058: magnetic; electromagnetic
- F16C 32/047: {Details of housings; Mounting of active magnetic bearings}
- F16C 32/0474: {for rotary movement}
- F16C 35/00: Rigid support of bearing units; Housings, e.g. caps, covers (F16C23/00 takes precedence)
- H02K 5/128: using air-gap sleeves or air-gap discs
- H02K 5/1282: {the partition wall in the air-gap being non cylindrical}
- F05D 2230/232: by welding
- F05D 2300/171: Steel alloys
- F05D 2300/175: Superalloys
- F05D 2300/507: Magnetic properties
- F16C 2300/42: corrosive, i.e. with aggressive media or harsh conditions
- Y10T 29/49012: Rotor
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- 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})
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A canned or sleeved rotary machine is equipped with a rotor (101) in contact with a particle-laden, acidic or corrosive gaseous atmosphere, and with a functional electrical assembly such as a magnetic bearing comprising a rotor armature (106) secured to the rotor (101) and placed in the gaseous atmosphere and a stator armature (104) secured to a stationary support (102) and positioned facing the rotor armature (106), the stator armature (104) comprising at least one winding (142, 143) and a ferromagnetic body (141) which are positioned in a protective metal enclosure comprising a solid part secured to the stationary support (102) or coincident therewith, a thin can or sleeve (103) and a hermetic passage (108) for wiring (108a) supplying the windings (142, 143). A potting compound (107) fills residual internal gaps left in the ferromagnetic body (141), the windings (142, 143) and the wiring (108a), and a dead volume (109) in which the pressure is below atmospheric pressure is created inside the protective metal enclosure (102, 103, 108).

## Claims

### Claim 1

A canned or sleeved rotary machine comprising:
a rotor that is disposed in a particle-laden, acidic or corrosive liquid or gaseous atmosphere; and
a functional electrical assembly, the functional electrical assembly including:
a rotor armature secured to the rotor and placed in said acidic or corrosive liquid or gaseous atmosphere, and
a stator armature that is secured to a stationary support and positioned facing said rotor armature, the stator armature comprising at least one winding and a ferromagnetic body that are positioned in a protective metal enclosure comprising:
a solid part secured to the stationary support or coincident therewith,
a thin can or sleeve, and
a hermetic passage for wiring supplying said windings;
wherein a potting compound fills residual internal gaps left in the ferromagnetic body, the windings, and the wiring, and
wherein a dead volume in which the pressure is below atmospheric pressure is created inside the protective metal enclosure.

### Claim 2 (depends on 1)

The machine as claimed in claim 1, wherein said dead volume is formed behind said hermetic passage.

### Claim 3 (depends on 1)

The machine as claimed in claim 1, wherein the protective metal enclosure comprises a drilling so that the vacuum can be created in said dead volume and a blanking plug welded in position to plug said drilling while at the same time maintaining the vacuum.

### Claim 4 (depends on 1)

The machine as claimed in claim 1, wherein the dead volume has a capacity in excess of 100 cm3.

### Claim 5 (depends on 1)

The machine as claimed in claim 1, wherein the thin can or sleeve has a thickness of between 0.3 and 2 mm.

### Claim 6 (depends on 1)

The machine as claimed in claim 1, wherein the air gap (Δ) between the rotor armature and the stator armature is between 0.4 and 3 mm.

### Claim 7 (depends on 1)

The machine as claimed in claim 1, wherein the thin can or sleeve is made of at least one of magnetic, 17-4 Precipitation Hardening Type 630 stainless steel alloy, non-magnetic, Type 316L stainless steel, non-magnetic, Type 904L stainless steel or INCONEL.

### Claim 8 (depends on 1)

The machine as claimed in claim 1, wherein the functional electrical assembly consists of an axial magnetic bearing with a rotor armature in the form of a disk perpendicular to the rotor.

### Claim 9 (depends on 1)

The machine as claimed in claim 1, wherein the functional electrical assembly consists of a radial magnetic bearing.

### Claim 10 (depends on 1)

The machine as claimed in claim 1, wherein the functional electrical assembly consists of a canned electric motor.

### Claim 11 (depends on 1)

The machine as claimed in claim 1, wherein the functional electrical assembly consists of a sleeved detector associated with a magnetic bearing.