US3816780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor structure for supercooled field winding
Assignee: Massachusetts Institute of Technology
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Filing: 1972-08-18
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Granted: 1974-06-11
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Expires: 1992-08-18
Abstract
Abstract A rotor for a cryogenic machine having a supercooled field winding including a hollow shaft rotatably supported on axle means and having an internal vacuum chamber; a field winding structure having radial interstices and axial interstices; a field winding structure compartment carried by the shaft for supporting the field winding structure; low thermal conductivity interconnection means interconnecting the compartment with the axle means; at least one heat exchanger means including a first member in thermal communication with the interconnection means at a discrete position along the interconnection means for removing heat from the interconnection means and a second member including a first conduit in thermal communication with the first member for removing heat from the first member using supercooled fluid flowing through the first conduit at a temperature higher than that of the supercooled field winding; and a convection trap associated with each heat exchanger means including a second conduit interconnected with the first conduit and having a portion having a course extending from larger to small radius to trap the warmer less dense fluid nearer the center of the rotor and the colder more dense fluid nearer the periphery of the rotor to prevent centrifugal convection in the centrifugal force field of the rotor.
Inventors
- 👤 J Smith
- 👤 P Thullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:06
CPC Classifications
H; H01; H01F; H01F6/00; H01F6/06; H01F6/065; H02; H02K; H02K55/00; H02K55/02; H02K55/04; H02K9/00; H02K9/19; H02K9/197; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
210 words
A rotor for a cryogenic machine having a supercooled field winding comprising: a hollow shaft rotatably supported on axle means and having an internal vacuum chamber; a field winding structure having radial interstices, circumferential interstices and axial interstices; a field winding structure compartment carried by said shaft for supporting said field winding structure; low thermal conductivity interconnection means interconnecting said compartment with said axle means; at least one heat exchanger means each including a first member in thermal communication with said interconnection means at a discrete position on said interconnection means for removing heat from said interconnection means and a second member including a first conduit in thermal communication with said first member for removing heat from said first member using supercooled fluid flowing through said first conduit at an average temperature higher than that of the supercooled field winding; and a convection trap associated with each said heat exchanger means including a second conduit interconnected with said first conduit and having a portion having a course extending from larger to smaller radius to trap the warmer, less dense, fluid nearer the center of said rotor and the cooler, more dense, fluid nearer the periphery of said rotor to prevent centrifugal convection in the centrifugal force field of said rotor.
Claim 2
Dependent Claim
210 words
A rotor for a cryogenic machine having a supercooled field winding comprising: a hollow shaft rotatably supported on axle means and having an internal vacuum chamber; a field winding structure having radial interstices, circumferential interstices and axial interstices; a field winding structure compartment carried by said shaft for supporting said field winding structure; low thermal conductivity interconnection means interconnecting said compartment with said axle means; at least one heat exchanger means each including a first member in thermal communication with said interconnection means at a discrete position on said interconnection means for removing heat from said interconnection means and a second member including a first conduit in thermal communication with said first member for removing heat from said first member using supercooled fluid flowing through said first conduit at an average temperature higher than that of the supercooled field winding; and a convection trap associated with each said heat exchanger means including a second conduit interconnected with said first conduit and having a portion having a course extending from larger to smaller radius to trap the warmer, less dense, fluid nearer the center of said rotor and the cooler, more dense, fluid nearer the periphery of said rotor to prevent centrifugal convection in the centrifugal force field of said rotor.
Claim 3
Dependent Claim
35 words
The rotor of claim 1 in which said axle means includes two axles one at either end of said rotor and said interconnection means includes two interconnection assemblies one interconnecting each axle with said compartment.
Claim 4
Dependent Claim
24 words
The rotor of claim 1 in which said compartment is recessed in said shaft and includes a cover at the surface of said shaft.
Claim 5
Dependent Claim
24 words
The rotor of claim 1 further including a radiation shield extending over said compartment and being in thermal communication with said heat exchanger means.
Claim 6
Dependent Claim
20 words
The rotor of claim 1 in which said first member of said heat exchanger means includes two threadably interconnectable rings.
Claim 7
Dependent Claim
110 words
The rotor of claim 1 in which said field winding structure compartment includes a cylindrical support member and said field winding support includes a first set of insulating circumferential straps fastened to said cylindrical support member in axially spaced relation to form radial, circumferential interstices for passing supercooling fluid; at least one field winding layer including at least two windings each including a pole piece mounted on said straps and having radial interstices for passing supercooling fluid; a winding wound about said pole piece on said straps; and end pieces completing the area of the layer beyond the ends of the winding and having radial interstices for passing supercooling fluid.
Claim 8
Dependent Claim
43 words
The field winding structure of claim 6 further including a plurality of tapes which are interwoven with the conductors which form the winding in circumferential paths aligned with said straps and which separate said conductors to provide radial interstices for passing supercooling fluid.
Claim 9
Dependent Claim
27 words
The field winding structure of claim 6 in which said pole pieces and said end pieces include axial grooves intersecting said radial interstices for passing supercooling fluid.
Claim 10
Dependent Claim
29 words
The field winding structuRe of claim 6 in which said cylindrical support member includes axial grooves in its surface bearing said first set of straps for passing supercooling fluid.
Claim 11
Dependent Claim
56 words
The rotor of claim 6 in which each end portion of a said winding includes a first 60* angle bend, a first 60* helical path to an apex, a second 60* angle bend at the apex, a second 60* helical path in the opposite direction to the first helical path and a third 60* angle bend.
Claim 12
Dependent Claim
91 words
The rotor of claim 1 further including an isolation junction interface between the superconducting field winding leads and normal conducting leads including a superconductor and a tube surrounding said superconductor and carrying the supercooled fluid, a junction box interconnected with said tubes and containing said supercooled fluid, a normal lead corresponding to each superconductor and interconnected therewith in said junction box, each of said normal leads including a cylindrical, braided conductor formed of a plurality of smaller conducting elements and supported between concentric insulator tubes between which said supercooled fluid passes.
Claim 13
Dependent Claim
23 words
The rotor of claim 6 in which said tapes are impregnated with thermosetting resin and are bonded to adjacent superconductors and circumferential straps.
Claim 14
Dependent Claim
53 words
The rotor of claim 6 in which there is a plurality of field winding layers and a plurality of sets of insulating circumferential straps, each field winding layer being mounted on one set of straps and being held in place by a second set of straps which mounts the next field winding layer.
Claim 15
Dependent Claim
65 words
The rotor of claim 13 in which each of the straps mounted with a field winding layer is aligned with a respective one of each of the tapes associated with that field winding layer and each of the straps and tapes associated with each of the field winding layers are aligned with those in adjacent layers to provide radial, circumferential interstices for passing supercooling fluid.
Claim 16
Dependent Claim
103 words
A field winding structure for the rotor of a cryogenic machine comprising: a cylindrical support member; a first set of insulating circumferential straps fastened to said cylindrical support member in axially spaced relation to form radial, circumferential interstices for passing supercooling fluid; at least one field winding layer including at least two windings each including a pole piece mounted on said straps and having radial interstices for passing supercooling fluid; a winding wound about said pole piece on said straps; and end pieces completing the area of the layer beyond the ends of the winding and having radial interstices for passing supercooling fluid.
Claim 17
Dependent Claim
103 words
A field winding structure for the rotor of a cryogenic machine comprising: a cylindrical support member; a first set of insulating circumferential straps fastened to said cylindrical support member in axially spaced relation to form radial, circumferential interstices for passing supercooling fluid; at least one field winding layer including at least two windings each including a pole piece mounted on said straps and having radial interstices for passing supercooling fluid; a winding wound about said pole piece on said straps; and end pieces completing the area of the layer beyond the ends of the winding and having radial interstices for passing supercooling fluid.
Claim 18
Dependent Claim
43 words
The field winding structure of claim 15 further including a plurality of tapes which are interwoven with the conductors which form the winding in circumferential paths aligned with said straps and which separate said conductors to provide radial interstices for passing supercooling fluid.
Claim 19
Dependent Claim
27 words
The field winding structure of claim 15 in which said pole pieces and said end pieces include axial grooves intersecting said radial interstices for passing supercooling fluid.
Claim 20
Dependent Claim
29 words
The field winding structure of claim 14 in which said cylindrical support member includes axial grooves in its surface bearing said first set of straps for passing supercooling fluid.
Claim 21
Dependent Claim
23 words
The rotor of claim 15 in which said tapes are impregnated with thermosetting resin and are bonded to adjacent superconductors and circumferential straps.
Claim 22
Dependent Claim
53 words
The rotor of claim 15 in which there is a plurality of field winding layers and a plurality of sets of insulating circumferential straps, each field winding layer being mounted on one set of straps and being held in place by a second set of straps which mounts the next field winding layer.
Claim 23
Dependent Claim
65 words
The rotor of claim 20 in which each of the straps mounted with a field winding layer is aligned with a respective one of each of the tapes associated with that field winding layer and each of the sTraps and tapes associated with each of the field winding layers are aligned with those in adjacent layers to provide radial, circumferential interstices for passing supercooling fluid.
Claim 24
Dependent Claim
69 words
An isolated junction interface between superconducting field winding leads and normal conducting leads including a superconductor and a tube surrounding said superconductor and carrying the supercooled fluid, a junction box interconnected with said tubes and containing said supercooled fluid, a normal lead corresponding to each superconductor and interconnected therewith in said junction box, each of said normal leads contained within a conduit for the passage of said supercooled fluid.
Claim 25
Dependent Claim
69 words
An isolated junction interface between superconducting field winding leads and normal conducting leads including a superconductor and a tube surrounding said superconductor and carrying the supercooled fluid, a junction box interconnected with said tubes and containing said supercooled fluid, a normal lead corresponding to each superconductor and interconnected therewith in said junction box, each of said normal leads contained within a conduit for the passage of said supercooled fluid.
Claim 26
Dependent Claim
38 words
The isolated junction interface of claim 22 in which the said normal leads include a cylindrical, braided conductor formed of a plurality of smaller conducting elements and supported between concentric insulator tubes between which said supercooled fluid passes.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |