Patent US4118474A successfully refreshed from Google Patents.
Patent US5061679A successfully refreshed from Google Patents.
US5061679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive system employing frictionless bearings including superconducting matter
Assignee: University of Arkansas at Fayetteville
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Filing: 1989-03-17
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Granted: 1991-10-29
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Expires: 2009-03-17
Abstract
Abstract A device employing frictionless bearings including a mass of superconductor material having a superconducting temperature T c above about 77° K., magnet having an axis of symmetry being levitated from said mass of superconductor material so as to be rotatable about its axis of symmetry, and a support member attached to the magnet, the support member being driven so as to cause the magnet to rotate about its axis of symmetry. Additionally, there is included a frictionless commutator wherein a signal beam is intermittently interrupted by a member attached to the magnet, such intermittent interruption of the beam being detected and employed to cause alternate energization and de-energization of a solenoid which, in turn, creates a magnetic field. The solenoid magnetic field is employed to attract and repel second magnets positioned about the member so as to rotatably drive the first magnet.
Inventors
- 👤 II David E. Weeks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:15
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/04; H02K15/0414; F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/0408; F16C32/0436; F16C32/0438; H02K29/00; H02K29/06; H02K29/10; H02K7/00; H02K7/08; H02K7/09
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
78 words
An apparatus comprising: (a) a rotatable support member; (b) a pair of first magnets positioned at opposite ends of the support member, said magnets having axes of symmetry and being rotatable about said axes; (c) a mass of a superconducting material positioned adjacent each first magnet so that based on current understanding each magnet is levitated from the mass of superconducting material by means of persistent currents induced in the mass of superconducting material by said first magnets.
Claim 2
Independent Claim
78 words
An apparatus comprising: (a) a rotatable support member; (b) a pair of first magnets positioned at opposite ends of the support member, said magnets having axes of symmetry and being rotatable about said axes; (c) a mass of a superconducting material positioned adjacent each first magnet so that based on current understanding each magnet is levitated from the mass of superconducting material by means of persistent currents induced in the mass of superconducting material by said first magnets.
Claim 3
Dependent Claim
14 words
The apparatus of claim 1, wherein the first magnets are made of cobalt samarium.
Claim 4
Dependent Claim
22 words
The apparatus of claim 1, wherein the first magnets are cylindrically shaped, the axes of which are aligned with the support member.
Claim 5
Dependent Claim
32 words
The apparatus of claim 1, wherein the mass of superconducting material is made of a copper oxide perovskite material having a superconducting temperature T c that is greater than about 77° K.
Claim 6
Dependent Claim
52 words
The apparatus of claim 1, including second magnets mounted about the support member and a solenoid positioned in proximity with the second magnets so that intermittent energization of the solenoid by means of a power source coupled thereto operatively repulses and attracts the second magnets to cause rotation of the support member.
Claim 7
Dependent Claim
14 words
The device of claim 1, wherein the mass of superconducting material is disk shaped.
Claim 8
Independent Claim
92 words
A device, comprising: a magnet having an axis of symmetry; a support member attached to said magnet; and a mass of superconducting material located adjacent said magnet so that based on current understanding persistent currents are induced in the mass of superconducting material by the magnet so as to cause the magnet to be levitated from the mass of superconducting material, said magnet being freely rotatable about its axis of symmetry, the mass of superconducting material being made of a copper oxide perovskite material having a superconducting temperature above about 77° K.
Claim 9
Independent Claim
92 words
A device, comprising: a magnet having an axis of symmetry; a support member attached to said magnet; and a mass of superconducting material located adjacent said magnet so that based on current understanding persistent currents are induced in the mass of superconducting material by the magnet so as to cause the magnet to be levitated from the mass of superconducting material, said magnet being freely rotatable about its axis of symmetry, the mass of superconducting material being made of a copper oxide perovskite material having a superconducting temperature above about 77° K.
Claim 10
Dependent Claim
17 words
The device of claim 7, wherein the magnet is made of cobalt samarium and is cylindrically shaped.
Claim 11
Independent Claim
211 words
An apparatus, comprising: (a) a pair of superconductors made of a superconducting material of copper oxide perovskite and having a superconducting temperature above about 77° K.; (b) a pair of cylindrically shaped first magnets made of cobalt samarium positioned about the superconductors, one of said first magnets positioned above each superconductor, each of said first magnets being supported above its respective superconductor, based on current understanding, by means of magnet fields created by persistent current induced by the first magnets in each superconductor; (c) a shaft supported by the first magnets, one of said first magnets attached to each end of the shaft; (d) a plurality of second magnets attached in a circle about the shaft; (e) a laser beam generator; (f) a light detector operatively associated with the laser beam generator so as to detect beams emitted by the laser beam generator; (g) means mounted about the shaft for intermittently interrupting a beam generated by the laser beam generator; and (h) a solenoid operatively associated with the light detector so that detection of the beam by the light detector causes energization of the solenoid, the solenoid being operatively positioned in proximity to the second magnets so as to repel and attract the second magnets to cause the shaft to rotate.
Claim 12
Independent Claim
211 words
An apparatus, comprising: (a) a pair of superconductors made of a superconducting material of copper oxide perovskite and having a superconducting temperature above about 77° K.; (b) a pair of cylindrically shaped first magnets made of cobalt samarium positioned about the superconductors, one of said first magnets positioned above each superconductor, each of said first magnets being supported above its respective superconductor, based on current understanding, by means of magnet fields created by persistent current induced by the first magnets in each superconductor; (c) a shaft supported by the first magnets, one of said first magnets attached to each end of the shaft; (d) a plurality of second magnets attached in a circle about the shaft; (e) a laser beam generator; (f) a light detector operatively associated with the laser beam generator so as to detect beams emitted by the laser beam generator; (g) means mounted about the shaft for intermittently interrupting a beam generated by the laser beam generator; and (h) a solenoid operatively associated with the light detector so that detection of the beam by the light detector causes energization of the solenoid, the solenoid being operatively positioned in proximity to the second magnets so as to repel and attract the second magnets to cause the shaft to rotate.
Claim 13
Dependent Claim
37 words
The apparatus of claim 9, wherein the means for intermittently interrupting the beam comprises a disk mounted about the shaft, the disk generally interrupting transmission of the beam and having apertures through which the beam intermittently passes.
Claim 14
Dependent Claim
17 words
The apparatus of claim 10, wherein the second magnets are positioned about a periphery of the disk.
References Cited (Backward Citations)
US3025151A
Cited
DE1283946B
Cited
US4545209A
Cited
US4726640A
Cited
US4820950A
Cited
US4797386A
Cited
US4886778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-28 | 1995-04-29 | 1995-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-28 | 1999-04-29 | 1999-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-28 | 2003-04-29 | 2003-10-29 | $7700.00 | Window Closed / Lapsed |