Patent US3729640A successfully refreshed from Google Patents.
US3729640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconducting electrical machines
Assignee: JOHN THOMPSON (PIPEWORK AND ORDNANCE DIVISION) Ltd
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Filing: 1971-02-16
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Granted: 1973-04-24
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Expires: 1991-02-16
Abstract
Abstract A synchronous electrical generator having a rotor with a superconducting winding and coolant ducts for the winding and for the end part of the rotor, liquid helium being supplied to the winding coolant ducts through a radial passage and the heat generated by centrifugal action on the liquid passing through the passage being conducted back to the radially inner end of the passage and dissipated in the liquid cooling the end part of the rotor.
Inventors
- 👤 J Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:52
CPC Classifications
H; H02; H02K; H02K55/00; H02K55/02; H02K55/04; H02K9/00; H02K9/19; H02K9/197; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
In a superconducting electrical machine, a hollow rotor having a cylindrical center part, two conical end parts, and rotor shafts jointed to said central part by said end parts, bearings supporting said rotor shafts, a superconducting winding carried by said central part of the rotor, winding cooling ducts in heat exchange relation with said winding for circulating cryogenic fluid to cool said winding, wall cooling ducts in heat exchange relation to one of said conical end parts for circulating cryogenic fluid to cool the wall of one end part of the rotor, supply means for supplying cryogenic fluid, a first passage extending generally radially from said supply means to said winding cooling ducts, a secoNd passage extending from said supply means to said wall cooling ducts, and heat transfer means for conveying heat from the radially outer end of said first passage to said supply means to dissipate heat from said windings in cryogenic fluid fed to said second passage.
Claim 2
Dependent Claim
160 words
In a superconducting electrical machine, a hollow rotor having a cylindrical center part, two conical end parts, and rotor shafts jointed to said central part by said end parts, bearings supporting said rotor shafts, a superconducting winding carried by said central part of the rotor, winding cooling ducts in heat exchange relation with said winding for circulating cryogenic fluid to cool said winding, wall cooling ducts in heat exchange relation to one of said conical end parts for circulating cryogenic fluid to cool the wall of one end part of the rotor, supply means for supplying cryogenic fluid, a first passage extending generally radially from said supply means to said winding cooling ducts, a secoNd passage extending from said supply means to said wall cooling ducts, and heat transfer means for conveying heat from the radially outer end of said first passage to said supply means to dissipate heat from said windings in cryogenic fluid fed to said second passage.
Claim 3
Dependent Claim
21 words
A machine as claimed in claim 1 in which said heat transfer means comprise a solid member of high thermal conductivity.
Claim 4
Dependent Claim
40 words
A machine as claimed in claim 1, wherein said first and second passages have a common junction with said supply means and said heat transfer means extends between this common junction and said radially outer end of the first passage.
Claim 5
Dependent Claim
21 words
A machine as claimed in claim 3 in which said heat transfer means comprise a solid member of high thermal conductivity.
Claim 6
Dependent Claim
19 words
A machine as claimed in claim 1, wherein the said supply means includes refrigeration equipment located within the rotor.
References Cited (Backward Citations)
US2986905A
Cited
US3368087A
Cited
US3440456A
Cited
US3478232A
Cited
US3521091A
Cited
US3517231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |