US3835663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconducting dynamo-electric machines
Assignee: Rolls Royce Power Engineering PLC
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Filing: 1973-04-27
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Granted: 1974-09-17
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Expires: 1993-04-27
Abstract
Abstract A homopolar dynamo-electric machine having a stationary superconducting field winding contained in a cryostat through which liquid helium is circulated by a main cooling circuit is provided with an auxiliary cooling circuit to allow the winding to operate at partial load in the event of failure of the main cooling circuit or of the vacuum insulation of the cryostat.
Inventors
- 👤 A Appleton
- 👤 F Tinlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:27
CPC Classifications
H; H02; H02K; H02K31/00; H01; H01F; H01F6/00; H01F6/04; H02K55/00; H02K55/06; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
95 words
In a dynamo-electric machine having a rotor, a stator, a cryostat containment vessel mounted on said stator, a field winding of superconductive material enclosed in said vessel, and a cooling system for maintaining said field winding at superconducting temperature by the circulation of cryogenic fluid, the improvement comprising an auxiliary coolant system including coolant ducts associated with said winding and headers connected to said ducts, and means for establishing a fluid connection to said headers for circulating an auxiliary coolant through said headers and ducts in the event of failure of the main cooling system.
Claim 2
Dependent Claim
95 words
In a dynamo-electric machine having a rotor, a stator, a cryostat containment vessel mounted on said stator, a field winding of superconductive material enclosed in said vessel, and a cooling system for maintaining said field winding at superconducting temperature by the circulation of cryogenic fluid, the improvement comprising an auxiliary coolant system including coolant ducts associated with said winding and headers connected to said ducts, and means for establishing a fluid connection to said headers for circulating an auxiliary coolant through said headers and ducts in the event of failure of the main cooling system.
Claim 3
Dependent Claim
65 words
In a dynamo-electric machine as claimed in claim 1 wherein said cryostat containment vessel is enclosed within an outer vessel and the space between said vessels is evacuated, said headers terminating in said evacuated space and said outer vessel having a removable cover whereby connecting pipes of an auxiliary coolant circuit may be attached to the headers after release of the vacuum in said space.
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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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |