US5030863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling system for superconducting rotating machine
Assignee: Mitsubishi Electric Corp
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Filing: 1990-02-14
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Granted: 1991-07-09
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Expires: 2010-02-14
Abstract
Abstract A superconducting rotating electric machine has superconducting rotor windings made from a high-temperature superconductor having a critical temperature of at least 78° K. The rotor windings are cooled by a liquid coolant such as liquid nitrogen which is sprayed from the stator directly at the outer surface of the rotor.
Inventors
- 👤 Hideto Yoshimura
- 👤 Toshiyuki Amano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:49
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/19; H02K9/20; H02K55/00; H02K55/02; H02K55/04; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
77 words
A cooling system for a rotating electrical machine having a rotor with an outer surface and a superconducting rotor winding having a critical temperature below which the rotor winding is superconducting, a stator surrounding the rotor, and a stator winding supported by the stator, the cooling system comprising cooling means for spraying a liquid coolant having a boiling point no higher than the critical temperature of said superconducting rotor winding at the outer surface of the rotor.
Claim 2
Dependent Claim
77 words
A cooling system for a rotating electrical machine having a rotor with an outer surface and a superconducting rotor winding having a critical temperature below which the rotor winding is superconducting, a stator surrounding the rotor, and a stator winding supported by the stator, the cooling system comprising cooling means for spraying a liquid coolant having a boiling point no higher than the critical temperature of said superconducting rotor winding at the outer surface of the rotor.
Claim 3
Dependent Claim
37 words
The cooling system of claim 1 wherein said cooling means comprises: a plurality of spraying elements opposing the outer surface of the rotor; and coolant supply means for supplying liquid coolant under pressure to the spraying elements.
Claim 4
Dependent Claim
12 words
The cooling system of claim 2, wherein said spraying elements are nozzles.
Claim 5
Dependent Claim
12 words
The cooling system of claim 2, wherein said spraying elements are orifices.
Claim 6
Dependent Claim
27 words
The cooling system of claim 2 wherein each spraying element is oriented to discharge a spray of liquid coolant perpendicular to the outer surface of the rotor.
Claim 7
Dependent Claim
30 words
The cooling system of claim 2, wherein each spraying element is oriented so that the center of a spray discharged therefrom is oblique to the outer surface of said rotor.
Claim 8
Dependent Claim
31 words
The cooling system of claim 6 wherein each spraying element is oriented so that the center of the spray discharged therefrom is oriented in the direction of rotation of the rotor.
Claim 9
Dependent Claim
30 words
The cooling system of claim 7 wherein each spraying element is oriented so that the center of the spray discharged therefrom is tangential to the outer surface of the rotor.
Claim 10
Dependent Claim
37 words
The cooling system of claim 7 wherein each of said spraying elements is oriented so that the direction of the center of the spray discharged therefrom has a component along the axis of rotation of the rotor.
Claim 11
Dependent Claim
35 words
The cooling system of claim 6 wherein each spraying element is disposed so that the direction of the center of the spray discharged therefrom is oriented opposite from the direction of rotation of the rotor.
Claim 12
Dependent Claim
42 words
The cooling system of claim 1 comprising a plurality of guides for the liquid coolant secured to the outer surface of the rotor, each of said guides extending outwardly from the rotor and oriented in the direction of rotation of the rotor.
Claim 13
Dependent Claim
30 words
The cooling system of claim 1 comprising: a plurality of coolant supply pipes embedded in the stator winding; and means for supplying the liquid coolant through the coolant supply pipes.
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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) | 1994-07-08 | 1995-01-07 | 1995-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-08 | 1999-01-07 | 1999-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-08 | 2003-01-07 | 2003-07-09 | $7700.00 | Window Closed / Lapsed |