US4393429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconductive coil system with protecting device
Assignee: Hitachi Ltd
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Filing: 1981-04-24
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Granted: 1983-07-12
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Expires: 2001-04-24
Abstract
Abstract A superconductive coil has both its terminals connected in parallel with a protecting device which has a diode and a unipolar d.c. motor connected in series with each other. The superconductive coil is further connected with an energizing d.c. power source through a switch. The conductive direction of the diode is so selected that the d.c. motor is driven by the energizing energy of the superconductive coil when the switch is opened in the quenching operation of the superconductive coil.
Inventors
- 👤 Naoki Maki
- 👤 Seiji Numata
- 👤 Kiyoshi Yamaguchi
- 👤 Heroe Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:53
CPC Classifications
H; H01; H01F; H01F6/00; H01F6/006; H02; H02H; H02H7/00; H02H7/001; Y; Y02; Y02E; Y02E30/00; Y02E30/10; Y02E40/00; Y02E40/60; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/85
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
A superconductive coil system comprising: a superconductive coil adapted to be energized when in a normal running operation by an energizing power source; and a protecting device connected in parallel with said superconductive coil for absorbing a portion of the magnetic energy of said superconductive coil when in the quenching operation of said superconductive coil, wherein said protecting device includes: a unidirectional current gate device for allowing a coil current to flow only in the same direction as that of the normal running operation when in the quenching operation of said superconductive coil; and a d.c. motor connected in series with said unidirectional current gate device.
Claim 2
Dependent Claim
106 words
A superconductive coil system comprising: a superconductive coil adapted to be energized when in a normal running operation by an energizing power source; and a protecting device connected in parallel with said superconductive coil for absorbing a portion of the magnetic energy of said superconductive coil when in the quenching operation of said superconductive coil, wherein said protecting device includes: a unidirectional current gate device for allowing a coil current to flow only in the same direction as that of the normal running operation when in the quenching operation of said superconductive coil; and a d.c. motor connected in series with said unidirectional current gate device.
Claim 3
Dependent Claim
109 words
A superconductive coil system comprising: a superconductive coil; a power source for energizing said superconductive coil; a current switch connected between said superconductive coil and said power source; and a protecting device connected in parallel with said superconductive coil for absorbing a portion of the magnetic energy of said superconductive coil when in the quenching operation of said superconductive coil, wherein said protecting device includes: a unidirectional current gate device for allowing a coil current only in the same direction as that of the normal running operation when in the quenching operation of said superconductive coil; and a d.c. motor connecting in series with said unidirectional current gate device.
Claim 4
Dependent Claim
109 words
A superconductive coil system comprising: a superconductive coil; a power source for energizing said superconductive coil; a current switch connected between said superconductive coil and said power source; and a protecting device connected in parallel with said superconductive coil for absorbing a portion of the magnetic energy of said superconductive coil when in the quenching operation of said superconductive coil, wherein said protecting device includes: a unidirectional current gate device for allowing a coil current only in the same direction as that of the normal running operation when in the quenching operation of said superconductive coil; and a d.c. motor connecting in series with said unidirectional current gate device.
Claim 5
Dependent Claim
18 words
A superconductive coil system according to claim 1 or 2, wherein said d.c. motor is a unipolar motor.
Claim 6
Dependent Claim
19 words
A superconductive coil system according to claim 1 or 2, wherein said unidirectional current gate device is a diode.
Claim 7
Dependent Claim
31 words
A superconductive coil system according to claim 1 or 2, wherein said protecting device further includes a resistor connected in series with said unidirectional current gate device and said d.c. motor.
Claim 8
Dependent Claim
92 words
A superconductive coil system comprising: a superconductive coil; and a protecting device connected in parallel with said superconductive coil and including a unidirectional current gate device and a d.c. motor connected in series with each other, the unidirectional current gate device of said protecting device having its conducting direction selected to allow a current to flow only in the same direction as that the normal running operation when in the quenching operation of said superconductive coil, said d.c. motor being adapted to energize said superconductive coil when in the normal running operation.
Claim 9
Dependent Claim
92 words
A superconductive coil system comprising: a superconductive coil; and a protecting device connected in parallel with said superconductive coil and including a unidirectional current gate device and a d.c. motor connected in series with each other, the unidirectional current gate device of said protecting device having its conducting direction selected to allow a current to flow only in the same direction as that the normal running operation when in the quenching operation of said superconductive coil, said d.c. motor being adapted to energize said superconductive coil when in the normal running operation.
Claim 10
Dependent Claim
19 words
A superconductive coil system according to claim 6, further comprising a resistor connected in parallel with said superconductive coil.
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) | 1986-07-11 | 1987-01-10 | 1987-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-11 | 1991-01-10 | 1991-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-11 | 1995-01-10 | 1995-07-12 | $7700.00 | Window Closed / Lapsed |