US4843271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive metal inserts in rotor dynamoelectric machine
Assignee: General Electric Co
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Filing: 1987-12-10
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Granted: 1989-06-27
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Expires: 2007-12-10
Abstract
Abstract A rotor of a dynamoelectric machine includes a coating of a high-conductivity metal covering a substantial portion of the surface thereof. The high-conductivity metal reduces resistive heating produced by eddy currents from high-frequency harmonics of an AC power source. In one embodiment of the invention, surfaces of dovetail wedges retaining energizing conductors in logitudinal slots are coated with a copper coating. The pole regions of the rotor include undercut slots to retain chamfered wedges of magnetic material coated with a high-conductivity metal. Retaining rings at opposed ends of the rotor may also be coated with a high-conductivity metal.
Inventors
- 👤 Manoj R. Shah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:37
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/12; H02K3/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
105 words
A rotor for a dynamoelectric machine comprising: a generally cylindrical rotor having at least first and second pole regions and at least first and second conductor regions; said conductor regions containing conductor for producing a magnetic field in said rotor; a coating of a high-conductivity metal on at least ten percent of a surface area of said cylindrical rotor; each of said conductor regions contains a plurality of longitudinal slots having conductors therein; each of said longitudinal slots includes a wedge covering an opening thereof; and, said high-conductivity coating metal is disposed at least on an outer surface of at least some of said wedges.
Claim 2
Dependent Claim
105 words
A rotor for a dynamoelectric machine comprising: a generally cylindrical rotor having at least first and second pole regions and at least first and second conductor regions; said conductor regions containing conductor for producing a magnetic field in said rotor; a coating of a high-conductivity metal on at least ten percent of a surface area of said cylindrical rotor; each of said conductor regions contains a plurality of longitudinal slots having conductors therein; each of said longitudinal slots includes a wedge covering an opening thereof; and, said high-conductivity coating metal is disposed at least on an outer surface of at least some of said wedges.
Claim 3
Dependent Claim
12 words
A rotor according to claim 1 wherein said coating metal is copper.
Claim 4
Dependent Claim
20 words
A rotor according to claim 1 wherein said wedges are of non-magnetic material and said high-conductivity coating metal is copper.
Claim 5
Dependent Claim
55 words
A rotor according to claim 1 wherein: said at least first and second pole regions include a plurality of longitudinal slots therein; each of said longitudinal slots includes a wedge fitted therein; and said coating metal disposed on at least an outer surface of said wedge in at least a substantial number of said wedges.
Claim 6
Dependent Claim
11 words
A according to claim 4 wherein said coating metal is copper.
Claim 7
Dependent Claim
13 words
A rotor according to claim 4 wherein said wedge is a magnetic metal.
Claim 8
Dependent Claim
23 words
A rotor according to claim 6 wherein said magnetic metal is substantially the same metal as in said first and second pole regions.
Claim 9
Dependent Claim
23 words
A rotor according to claim 1 wherein said coating has a thickness of from about 50 to about 250 thousandths of an inch.
Claim 10
Dependent Claim
40 words
A rotor according to claim 1, further comprising: first and second retaining rings at distal ends of said generally cylindrical rotor; and said high-conductivity coating metal covering a substantial portion of outer surfaces of said first and second retaining rings.
Claim 11
Dependent Claim
161 words
A rotor for a dynamoelectric machine comprising: a generally cylindrical rotor having at least first and second pole regions and at least first and second conductor regions; said conductor regions containing conductors for producing a magnetic field in said rotor; a coating of a high-conductivity metal on at least ten percent of a surface area of said cylindrical rotor; said conductor regions each containing a plurality of longitudinal slots having conductors therein; each of said longitudinal slots including a dovetail wedge covering an opening thereof; said high-conductivity coating metal disposed at least on an outer surface of at least some of said dovetail wedges; said at least first and second pole regions include a plurality of longitudinal slots therein; each of said longitudinal slots including at least one of said wedges fitted therein; and said high-conductivity coating metal disposed on at least an outer surface of a least one of said wedges in at least a substantial number of said wedges.
Claim 12
Dependent Claim
161 words
A rotor for a dynamoelectric machine comprising: a generally cylindrical rotor having at least first and second pole regions and at least first and second conductor regions; said conductor regions containing conductors for producing a magnetic field in said rotor; a coating of a high-conductivity metal on at least ten percent of a surface area of said cylindrical rotor; said conductor regions each containing a plurality of longitudinal slots having conductors therein; each of said longitudinal slots including a dovetail wedge covering an opening thereof; said high-conductivity coating metal disposed at least on an outer surface of at least some of said dovetail wedges; said at least first and second pole regions include a plurality of longitudinal slots therein; each of said longitudinal slots including at least one of said wedges fitted therein; and said high-conductivity coating metal disposed on at least an outer surface of a least one of said wedges in at least a substantial number of said wedges.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |