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US4807084A
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Superconducting magnet apparatus with emergency run down unit
Assignee: Mitsubishi Electric Corp
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Filing: 1987-09-03
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Granted: 1989-02-21
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Expires: 2007-09-03
Abstract
Abstract A superconducting magnet apparatus comprises a superconducting coil, a persistent current switch with a small current bearing capacity, and a protective element respectively connected in parallel with the superconducting coil and an emergency run down unit including a heater circuit having a heater power source, a heater element disposed in proximity to the superconducting coil, and a heater circuit switch connected in series with the heater element. Thus, the heater element is energized and warmed to bring at least a part of the superconducting coil into a normal state.
Inventors
- 👤 Moriaki Takechi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:25
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/001; H01; H01F; H01F6/00; H01F6/006; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A superconducting magnet apparatus comprising a superconducting coil, a persistent current switch, and a protective element respectively connected in parallel with said superconducting coil and an emergency run down unit including a heater circuit having a heater power source, a heater element disposed in proximity to said superconducting coil, and a heater circuit switch means connected in series with said heater element and actuable to provide current to said heater element to warm said superconducting coil and initiate a quench to cause said superconducting coil to revert to a normal state.
Claim 2
Dependent Claim
91 words
A superconducting magnet apparatus comprising a superconducting coil, a persistent current switch, and a protective element respectively connected in parallel with said superconducting coil and an emergency run down unit including a heater circuit having a heater power source, a heater element disposed in proximity to said superconducting coil, and a heater circuit switch means connected in series with said heater element and actuable to provide current to said heater element to warm said superconducting coil and initiate a quench to cause said superconducting coil to revert to a normal state.
Claim 3
Dependent Claim
29 words
A superconducting magnet apparatus as defined in claim 1 wherein said superconducting coil includes a plurality of coil segments in proximity to which corresponding heater elements are respectively disposed.
Claim 4
Dependent Claim
31 words
A superconducting magnet as defined in claim 2 wherein each of said heater elements has a heater circuit switch means enabling the heater elements to be initially energized at different times.
Claim 5
Dependent Claim
18 words
A superconducting magnet apparatus as defined in claim 1, wherein said heater element is a sheet resistance element.
Claim 6
Dependent Claim
18 words
A superconducting magnet apparatus as defined in claim 2 wherein said heater element is a sheet resistance element.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |