US3568002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiaction flux pump
Assignee: United States Atomic Energy Commission
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Filing: 1968-11-18
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Granted: 1971-03-02
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Expires: 1988-11-18
Abstract
Abstract System for efficiently and quickly energizing superconducting magnet coils with direct current from an inexpensive, alternating current power supply by multiaction flux pumping, wherein continuously superconducting switching, and air core transformer coils are used to convert alternating current into a substantially continuously increasing direct current in the magnet coils while substantially preventing the dumping of large amounts of energy into the cryogenic cooling fluid for maintaining the magnet coils in their superconducting state whereby high magnetic fields are efficiently produced and/or maintained in the magnet coils.
Inventors
- 👤 Kenneth E Robins
- 👤 Richard B Britton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:15
CPC Classifications
H; H01; H01F; H01F6/00; H01F6/005; H02; H02M; H02M11/00; H10; H10N; H10N60/00; H10N60/30; H10N60/35; H10N60/355
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
325 words
Double acting flux pumping apparatus (11) for selectively maintaining equal and opposite currents and resultant magnetic fields in superconductor magnets (13 and 15), comprising superconductor magnets having at least two coils forming four coil ends (B, C, E and F) and junctions (63, 65, 67 and 69), superconductors (A, 55, D and G) connecting said junctions and coils in series in a first current loop formed with a separate single-turn inductor (55) for injecting current into said coils, and means connecting respective of said junctions to form with each of said coils second and third spaced apart superconductor current loops in series with said first current loop and superconductor elements (57 and 59) for alternately, oppositely opening and closing said second and thIrd current loops for continuously, sequentially, injecting oppositely circulating, equal and opposite, unidirectional currents into said coils through said inductor for selectively maintaining the current in said coils, alternating current power source means (19) for producing a continuously, rapidly, smoothly and periodically cycling alternating current having a first circuit responsive thereto for inducing alternating currents of opposite polarity in said inductor at a first phase for injecting said unidirectional currents into said coils, and a second circuit responsive to said alternating current for sequentially, alternately, oppositely actuating said superconductor elements at a different phase but in correspondence with the polarity of said alternating currents in said inductor and said unidirectional currents in said coils for sequentially, alternately, oppositely opening and closing said second and third current loops in correspondence with the polarity of said alternating currents but differing in phase therefrom, whereby said alternating current power source means actuates said first and second circuits to inject said unidirectional currents into said coils for selectively producing and maintaining equal and opposite magnetic fields in said coils, and controls the same for substantially continuously, selectively and efficiently supplying the current for maintaining the magnetic fields in said coils during all cycles of said alternating current.
Claim 2
Dependent Claim
325 words
Double acting flux pumping apparatus (11) for selectively maintaining equal and opposite currents and resultant magnetic fields in superconductor magnets (13 and 15), comprising superconductor magnets having at least two coils forming four coil ends (B, C, E and F) and junctions (63, 65, 67 and 69), superconductors (A, 55, D and G) connecting said junctions and coils in series in a first current loop formed with a separate single-turn inductor (55) for injecting current into said coils, and means connecting respective of said junctions to form with each of said coils second and third spaced apart superconductor current loops in series with said first current loop and superconductor elements (57 and 59) for alternately, oppositely opening and closing said second and thIrd current loops for continuously, sequentially, injecting oppositely circulating, equal and opposite, unidirectional currents into said coils through said inductor for selectively maintaining the current in said coils, alternating current power source means (19) for producing a continuously, rapidly, smoothly and periodically cycling alternating current having a first circuit responsive thereto for inducing alternating currents of opposite polarity in said inductor at a first phase for injecting said unidirectional currents into said coils, and a second circuit responsive to said alternating current for sequentially, alternately, oppositely actuating said superconductor elements at a different phase but in correspondence with the polarity of said alternating currents in said inductor and said unidirectional currents in said coils for sequentially, alternately, oppositely opening and closing said second and third current loops in correspondence with the polarity of said alternating currents but differing in phase therefrom, whereby said alternating current power source means actuates said first and second circuits to inject said unidirectional currents into said coils for selectively producing and maintaining equal and opposite magnetic fields in said coils, and controls the same for substantially continuously, selectively and efficiently supplying the current for maintaining the magnetic fields in said coils during all cycles of said alternating current.
Claim 3
Dependent Claim
103 words
The invention of claim 1 in which said first circuit, which is responsive to said alternating current power source means, has a capacitor (39) and a coil (41) inductively coupled to said inductor (55) for inducing alternating currents of opposite polarity in said inductor at said first phase, which is different from the phase of said actuation of said superconductor elements by said second circuit, and said second circuit is responsive to said same alternating current power source for sequentially opening and closing said second and third current loops at said different phase, whereby the difference in said phases is 75* to 90*.
Claim 4
Dependent Claim
142 words
The invention of claim 1 having cryostatic cooling means (29 and 31) for cooling said magnets, superconductors, superconductor elements, and inductor to superconducting temperatures, and wherein said second circuit has winding means responsive to said alternating current for providing increasing and decreasing magnetic fields that are 180* out of phase in correspondence with the phase and amplitude of said current from said alternating current source means for causing said superconductor elements (57 and 59) periodically, sequentially and oppositely to alternate between resistive and superconducting states for opening and closing said second and third current loops, said alternating current source means being in operable association with said current loops for selectively reversing the polarity and decreasing said magnetic fields in said coils, for preventing dumping large amounts of energy into said cryostatic cooling means and for preventing flux jumps in said magnet means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |