US5120706A
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: 1990-03-29
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Granted: 1992-06-09
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Expires: 2010-03-29
Abstract
Abstract A device employing frictionless bearings including a mass of superconductor material having a superconducting temperature T c above about 77° K., a 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
2026-11-05 07:26
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/10; F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/0408; F16C32/0436; F16C32/0438; H02K7/00; H02K7/08; H02K7/09; Y; Y10; Y10S; Y10S505/00; Y10S505/70
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
102 words
An apparatus, comprising: (a) a rotatable shaft member; (b) driving means for driving the shaft member comprising first magnets operatively secured about the shaft member about a radius thereof and means for generating a magnetic field positioned near an outer radius circumscribed by said first magnets; (c) means for generating a signal; (d) means attached to the shaft member for intermittently interrupting the signal; and (e) means for detecting the signal and operatively associated with the driving means to actuate said means for generating said magnetic field to drive the shaft member in rotating fashion by repelling and attracting said first magnets.
Claim 2
Independent Claim
102 words
An apparatus, comprising: (a) a rotatable shaft member; (b) driving means for driving the shaft member comprising first magnets operatively secured about the shaft member about a radius thereof and means for generating a magnetic field positioned near an outer radius circumscribed by said first magnets; (c) means for generating a signal; (d) means attached to the shaft member for intermittently interrupting the signal; and (e) means for detecting the signal and operatively associated with the driving means to actuate said means for generating said magnetic field to drive the shaft member in rotating fashion by repelling and attracting said first magnets.
Claim 3
Dependent Claim
34 words
The apparatus of claim 1, wherein the driving means comprises said first magnets equidistantly spaced at radial positions along a circle about the shaft member and a solenoid positioned in proximity to said circle.
Claim 4
Dependent Claim
26 words
The apparatus of claim 1, wherein the means for generating a signal comprises means for generating a light beam, and the signal comprises said light beam.
Claim 5
Dependent Claim
22 words
The apparatus of claim 3, wherein the means for detecting the signal includes a photocell operatively coupled to an amplifier driving input.
Claim 6
Dependent Claim
39 words
The apparatus of claim 4, wherein an amplifier is positioned in a circuit including another power supply and a solenoid so that detection of the beam causes the amplifier to thereby energize the solenoid to drive the shaft member.
Claim 7
Dependent Claim
24 words
The apparatus of claim 3, wherein the means for generating a light beam comprises a laser and the light beam comprises a laser beam.
Claim 8
Dependent Claim
36 words
The apparatus of claim 3, wherein the means for intermittently interrupting the signal includes a disk positioned about the shaft member, the disk interrupting the light beam, but including apertures through which the beam can pass.
Claim 9
Dependent Claim
22 words
The apparatus of claim 7, wherein the first magnets attached to the shaft member are attached about a periphery of the disk.
Claim 10
Dependent Claim
68 words
The apparatus of claim 1, wherein the shaft member is supported in levitated fashion by a pair of second magnets, said second magnets attached on opposite ends of said shaft member, each second magnet being positioned above a superconductor having Type II superconducting properties, so that, based on current understanding, each second magnet induces persistent currents in its superconductor to thereby levitate the shaft member above the superconductors.
Claim 11
Dependent Claim
14 words
The apparatus of claim 9, wherein the second magnets are made of cobalt samarium.
Claim 12
Dependent Claim
12 words
The apparatus of claim 9, wherein the second magnets are cylindrically shaped.
Claim 13
Dependent Claim
24 words
The apparatus of claim 9, wherein the superconductors are made of a copper oxide perovskite having a superconducting temperature T c above 77° K.
Claim 14
Dependent Claim
117 words
In a method of driving a rotatable shaft in non-contact fashion, the steps comprising: (a) providing said rotatable shaft with a disk attached thereto such that the disk is perpendicular to an axis of the shaft, the disk having a plurality of magnets disposed about an outer periphery of the disk; (b) generating a signal beam; (c) detecting the signal beams; (d) intermittently interrupting the signal beam in accordance with rotation of the shaft; (e) energizing a solenoid positioned adjacent a circle circumscribed by the magnets on the disk in accordance with detection of the signal beam; and driving the shaft in rotatable fashion by repelling and attracting the magnets positioned about the shaft with the solenoid.
Claim 15
Dependent Claim
117 words
In a method of driving a rotatable shaft in non-contact fashion, the steps comprising: (a) providing said rotatable shaft with a disk attached thereto such that the disk is perpendicular to an axis of the shaft, the disk having a plurality of magnets disposed about an outer periphery of the disk; (b) generating a signal beam; (c) detecting the signal beams; (d) intermittently interrupting the signal beam in accordance with rotation of the shaft; (e) energizing a solenoid positioned adjacent a circle circumscribed by the magnets on the disk in accordance with detection of the signal beam; and driving the shaft in rotatable fashion by repelling and attracting the magnets positioned about the shaft with the solenoid.
Claim 16
Dependent Claim
19 words
In the method of claim 13, directing the signal beam parallel to an axis of rotation of the shaft.
Claim 17
Dependent Claim
17 words
In the method of claim 13, passing the signal beam through said disk attached to the shaft.
Claim 18
Dependent Claim
15 words
In the method of claim 13, driving an amplifier upon detection of the signal beam.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |