US3740593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconductive magnets used in magnetohydrodynamic devices
Assignee: Avco Corp
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Filing: 1971-12-27
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Granted: 1973-06-19
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Expires: 1991-12-27
Abstract
Abstract A magnetohydrodynamic generator is shown in which a superconductive magnet is employed to create a magnetic field normal to the direction of flow of a high temperature, conductive gas stream. The magnet comprises opposed coils embraced by Ushaped iron frames which essentially neutralize the forces of attraction and repulsion created in these coils. The coils are mounted in Dewars, the inner casings and outer casings of which are interconnected by a spoke rod system which minimizes heat losses of liquid helium which is circulated through the inner casings to maintain the coils in a super cooled condition.
Inventors
- 👤 J Zar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:00
CPC Classifications
H; H02; H02K; H02K44/00; H02K44/08; H02K44/16; H01; H01F; H01F6/00; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/876; Y10S505/877; Y10S505/878
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
134 words
A magnet comprising a pair of opposed coils adaPted to be energized to create poles of opposite polarity, respectively, therein and first and second iron frame means of U-shaped cross section, each said frame means comprising a bridge portion and a pair of legs, the extreme ends of said legs being enlarged, said first and second frame means being oppositely disposed and spaced apart whereby the legs of said frame means extend over and embrace said coils, said frame means creating, outside of said coils, poles in said legs which are opposite in polarity to the polarity of the adjacent coils respectively thereby at least substantially reducing the polar forces of said coils when energized, and the enlargement of the ends of said legs provide an essentially uniform strength magnetic field between said coils.
Claim 2
Dependent Claim
134 words
A magnet comprising a pair of opposed coils adaPted to be energized to create poles of opposite polarity, respectively, therein and first and second iron frame means of U-shaped cross section, each said frame means comprising a bridge portion and a pair of legs, the extreme ends of said legs being enlarged, said first and second frame means being oppositely disposed and spaced apart whereby the legs of said frame means extend over and embrace said coils, said frame means creating, outside of said coils, poles in said legs which are opposite in polarity to the polarity of the adjacent coils respectively thereby at least substantially reducing the polar forces of said coils when energized, and the enlargement of the ends of said legs provide an essentially uniform strength magnetic field between said coils.
Claim 3
Dependent Claim
58 words
A magnet as in claim 1 in further combination with passageway for electrically conductive fluid in an MHD device and further wherein said coils are disposed on opposite sides of said passageway and in combination with said first and second frame means create a substantially uniform magnetic field normal to the direction of fluid flow through said passageway.
Claim 4
Dependent Claim
77 words
A combination as in claim 2 wherein said coils are respectively mounted in Dewars having spaced inner and outer casings, each coil is anchored within the inner casing of its Dewar for the circulation of an extremely low temperature fluid therethrough to provide superconductive flow of current through said coils and the inner and outer casings are interconnected by elongated spoke rod means for providing a heat conductive path of great length to there-by minimize heat losses.
Claim 5
Dependent Claim
90 words
A combination as in claim 2 wherein said passageway is in the form of an elongated, linear channel for an ionized, hot gas stream in an MHD generator said coils are disposed above and below said channel and have lengthwise runs disposed generally parallel to said channel, the runs of each coil, being respectively interconnected by bights at their opposite ends, and said first and second frame means extend substantially the length of said runs and respectively embrace opposed runs of the two coils on opposite sides of the channel.
Claim 6
Dependent Claim
35 words
A combination as in claim 3 further comprising spaced abutment means between the iner and outer casings of each Dewar for limiting relative movement therebetween and thus preventing excessive strain in the spoke rod means.
Claim 7
Dependent Claim
78 words
A combination as in claim 3 wherein each Dewar has a height substantially less than its width and the spoke rod means for horizontal support comprises a series of spoke rods angled from widthwise corners of the inner casing to the remote widthwise corners of the outer casing and for vertical support comprise spoke rods angled from the vertical corners of the inner casing to intermediate frame means and then to the vertical corners of the outer casing.
Claim 8
Dependent Claim
14 words
A combination as in claim 6 further comprising turnbuckles for tensioning said spoke rods
Claim 9
Dependent Claim
30 words
A combination as in claim 4 wherein at least one of said frames has an opening through its bridge portion providing for passage therethrough of service connections to said channel.
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |