Patent US4700094A successfully refreshed from Google Patents.
US4700094A
Expired / Lapsed
US
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Magnetic suspension system
Assignee: Charles Stark Draper Laboratory Inc
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Filing: 1986-07-22
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Granted: 1987-10-13
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Expires: 2006-07-22
Abstract
Abstract A magnetic suspension system including a first control coil for establishing circumferential current flow, and second and third control coils for establishing axial current flow. A support member of magnetic material has a gap for receiving the coils and there is a magnet for producing a magnetic field in the support member through the gap in the coils for generating Lorentz forces to support the coils in the axial and two mutually perpendicular radial directions.
Inventors
- 👤 James R. Downer
- 👤 David B. Eisenhaure
- 👤 George Oberbeck
- 👤 Tim E. Bliamptis
- 👤 Susan D. Hendrie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:58
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0474; F16C32/0485
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
92 words
A magnetic suspension system comprising: a first control coil for conducting circumferential current flow, and second and third control coils for conducting axial current flow; a support member of magnetic material having a gap for receiving said coils; a magnet for producing a magnetic field in said support member through said gap and said coils; and means for exciting said coils to interact with the magnetic field and produce Lorentz forces for supporting said coils and said support member relative to each other in the axial and two mutually perpendicular radial directions.
Claim 2
Dependent Claim
92 words
A magnetic suspension system comprising: a first control coil for conducting circumferential current flow, and second and third control coils for conducting axial current flow; a support member of magnetic material having a gap for receiving said coils; a magnet for producing a magnetic field in said support member through said gap and said coils; and means for exciting said coils to interact with the magnetic field and produce Lorentz forces for supporting said coils and said support member relative to each other in the axial and two mutually perpendicular radial directions.
Claim 3
Dependent Claim
16 words
The magnetic suspension system of claim 1 in which said magnet is disposed in said gap.
Claim 4
Dependent Claim
17 words
The magnetic suspension system of claim 1 in which said magnet is a rare earth cobalt magnet.
Claim 5
Dependent Claim
17 words
The magnetic suspension system of claim 1 in which said magnet is mounted on said support member.
Claim 6
Dependent Claim
16 words
The magnetic suspension system of claim 4 in which said magnet is disposed in said gap.
Claim 7
Dependent Claim
39 words
The magnetic suspension system of claim 1 in which said coils are mounted to stationary structure including a stator of a rotary machine and said support member is mounted to rotating structure including a rotor of said rotary machine.
Claim 8
Dependent Claim
21 words
The magnetic suspension system of claim 6 in which said stationary structure includes a housing to which said coils are attached.
Claim 9
Dependent Claim
22 words
The magnetic suspension system of claim 6 in which said rotating structure includes a flywheel to which said support member is attached.
Claim 10
Dependent Claim
25 words
The magnetic suspension system of claim 1 in which one of said coils and said support member is fixed and the other rotates relative thereto.
Claim 11
Dependent Claim
104 words
A rotary-bearing system for a rotary machine comprising: two magnetic bearings spaced from each other, each including: a first control coil for conducting circumferential current flow, and second and third control coils for conducting axial current flow; a support member of magnetic material having a gap for receiving said coils; a magnet for producing a magnetic field in said support member through said gap and said coils; and means for exciting said coils to interact with the magnetic field and produce Lorentz forces for supporting said coils and said support member relative to each other in the axial and two mutually perpendicular radial directions.
Claim 12
Dependent Claim
104 words
A rotary-bearing system for a rotary machine comprising: two magnetic bearings spaced from each other, each including: a first control coil for conducting circumferential current flow, and second and third control coils for conducting axial current flow; a support member of magnetic material having a gap for receiving said coils; a magnet for producing a magnetic field in said support member through said gap and said coils; and means for exciting said coils to interact with the magnetic field and produce Lorentz forces for supporting said coils and said support member relative to each other in the axial and two mutually perpendicular radial directions.
Claim 13
Dependent Claim
92 words
A magnetic suspension system comprising: a first control coil for establishing circumferential current flow, and second and third control coils for establishing axial current flow; a support member of magnetic material having a gap for receiving said coils; and a magnet for producing a magnetic field in said support member through said gap and coils for generating, in combination with said circumferential current flow and said axial current flow, Lorentz forces to support said coils and said support member relative to each other in the axial, and two mutually perpendicular radial directions.
Claim 14
Dependent Claim
92 words
A magnetic suspension system comprising: a first control coil for establishing circumferential current flow, and second and third control coils for establishing axial current flow; a support member of magnetic material having a gap for receiving said coils; and a magnet for producing a magnetic field in said support member through said gap and coils for generating, in combination with said circumferential current flow and said axial current flow, Lorentz forces to support said coils and said support member relative to each other in the axial, and two mutually perpendicular radial directions.
Claim 15
Dependent Claim
25 words
The magnet supension system of claim 11 in which one of said coils and said support member is fixed and the other rotates relative thereto.
Claim 16
Dependent Claim
39 words
The magnetic suspension system of claim 11 in which said coils are mounted to stationary structure including a stator of a rotary machine and said support member is mounted to rotating structure including a rotor of said rotary machine.
Claim 17
Dependent Claim
16 words
The magnetic suspension system of claim 11 in which said magnet is disposed in said gap.
Claim 18
Dependent Claim
80 words
A magnetic suspension system comprising: a first control coil for establishing circumferential current flow, and second and third control coils for establishing axial current flow; a support member of magnetic material having a gap for receiving said coils; and a magnet for producing a magnetic field in said support member through said gap and coils for generating Lorentz forces to support said coils and said support member relative to each other in the axial, and two mutually perpendicular radial directions.
Claim 19
Dependent Claim
80 words
A magnetic suspension system comprising: a first control coil for establishing circumferential current flow, and second and third control coils for establishing axial current flow; a support member of magnetic material having a gap for receiving said coils; and a magnet for producing a magnetic field in said support member through said gap and coils for generating Lorentz forces to support said coils and said support member relative to each other in the axial, and two mutually perpendicular radial directions.
Claim 20
Dependent Claim
85 words
A magnetic suspension system having a moving portion and a stationary portion for producing Lorentz forces to support the portions relative to each other in the axial and two mutually perpendicular radial directions, comprising: a first control coil for conducting circumferential current flow, and second and third control coils for conducting axial current flow; a support member of magnetic material having a gap for receiving said coils; and a magnet for producing a magnetic field in said support member through said gap and said coils.
Claim 21
Dependent Claim
85 words
A magnetic suspension system having a moving portion and a stationary portion for producing Lorentz forces to support the portions relative to each other in the axial and two mutually perpendicular radial directions, comprising: a first control coil for conducting circumferential current flow, and second and third control coils for conducting axial current flow; a support member of magnetic material having a gap for receiving said coils; and a magnet for producing a magnetic field in said support member through said gap and said coils.
Claim 22
Dependent Claim
28 words
The magnetic suspension system of claim 16 in which said control coils are included in the stationary portion and said support member is included in the moving portion.
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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) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |