Patent US2584975A successfully refreshed from Google Patents.
Patent US3787100A successfully refreshed from Google Patents.
US3787100A
Expired / Lapsed
US
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Devices including rotating members supported by magnetic bearings
Assignee: Laboratoire de Recherches Balistiques et Aérodynamiques
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Filing: 1972-12-11
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Granted: 1974-01-22
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Expires: 1992-12-11
Abstract
Abstract A gyroscope including a rotating member which is supported by a pair of magnetic bearings. Each bearing has two detectors for providing signals representative of the relative position of the member with respect to a common axis of the two bearings along first and second directions perpendicular to the axis and to each other. A feed-back loop controls biasing means in each bearing assembly and includes, for each direction, a summation circuit which sums the signals from the detectors corresponding to that direction in the two bearings and applies correction signals increasing with the summed signals to the biasing means corresponding to the directions in the two bearings. A subtracting circuit subtracts the signals from the detectors corresponding to the considered direction in the two bearings and applied correction signals to the biasing means, but through a polarity inverter in one of the bearings.
Inventors
- 👤 H Habermann
- 👤 P Joly
- 👤 Y Auber
- 👤 R Loyen
- 👤 Nee Voisen G Loyen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:24
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0444; F16C32/0451; G; G01; G01C; G01C19/00; G01C19/02; G01C19/04; G01C19/16; G01C19/24; F16C2360/00; F16C2360/44; F16C2360/45; F16C2370/00; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1261; Y10T74/1279
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
212 words
A device having: a member rotatable about an axis thereof, two magnetic bearing assemblies for rotatably maintaining said member aligned along a common axis of said bearings, at least two detectors associated with each of said bearings for providing signals representative of the relative position of said member with respect to said common axis along first and second directions perpendicular to said common axis, controllable biasing means in each said bearing assembly, adapted to exert forces on said member along said first and second directions, and feed-back means responsive to said signals for controlling said biasing means, said feed-back means comprising, for each of said directions : first means for summing the signals from the detectors corresponding to that direction in said two bearings and for applying correction means increasing with the summed signals to the biasing means corresponding to said direction in the two bearings, second means for subtracting the signals from the detectors corresponding to that direction in the two bearings and for applying correction means increasing with said difference to the biasing means corresponding to said direction in said two bearings, through a polarity inverter in one of said bearing assemblies, and a phase advance circuit between each said summing and subtracting means and the biasing means energized thereby.
Claim 2
Independent Claim
212 words
A device having: a member rotatable about an axis thereof, two magnetic bearing assemblies for rotatably maintaining said member aligned along a common axis of said bearings, at least two detectors associated with each of said bearings for providing signals representative of the relative position of said member with respect to said common axis along first and second directions perpendicular to said common axis, controllable biasing means in each said bearing assembly, adapted to exert forces on said member along said first and second directions, and feed-back means responsive to said signals for controlling said biasing means, said feed-back means comprising, for each of said directions : first means for summing the signals from the detectors corresponding to that direction in said two bearings and for applying correction means increasing with the summed signals to the biasing means corresponding to said direction in the two bearings, second means for subtracting the signals from the detectors corresponding to that direction in the two bearings and for applying correction means increasing with said difference to the biasing means corresponding to said direction in said two bearings, through a polarity inverter in one of said bearing assemblies, and a phase advance circuit between each said summing and subtracting means and the biasing means energized thereby.
Claim 3
Dependent Claim
30 words
Device according to claim 1, wherein the biasing means in each said bearing comprises two pairs of diametrically opposed electro-magnets and two pairs of diametrically opposed detectors of radial position.
Claim 4
Dependent Claim
23 words
Device according to claim 1, comprising additional detector means for providing an output signal representative of the axial position of said rotating member.
Claim 5
Dependent Claim
47 words
Device according to claim 3, wherein energization Of said biasing means exerts both an axial force and a radial force on the rotating member, and wherein said additional detector means are connected to the biasing means for said first and second directions simultaneously through phase advance means.
Claim 6
Dependent Claim
26 words
Device according to claim 1, wherein the phase advance means associated with said subtracting means have a passer band broader than that of said summing means.
Claim 7
Dependent Claim
34 words
Device according to claim 5, wherein each said broad band phase advance means comprises an input broad band phase RC network and an active output circuit comprising an amplifier having a resistor-capacitance feed-back loop.
Claim 8
Dependent Claim
43 words
Device according to claim 1, wherein each said biasing means receives energized signals from said summing and subtracting circuits through second summation circuits having several inputs each connected to at least one said first named summation means and at least one subtracting circuit.
Claim 9
Dependent Claim
52 words
Device according to claim 1, having a cross-circuit for dampening nutation movements, connected between the output of the subtracting means associated with the detectors providing signals representative of deflections in said first and second directions in one of said bearings and the biasing means active in said second or first direction, respectively.
Claim 10
Dependent Claim
60 words
Device according to claim 8, wherein cross-circuit comprises an adaptative network having an input connected to said subtracting means and another input connected to a generator providing a voltage at a frequency representative of the rotation speed of said member, said cross-circuit being constructed for having a narrow pass band which moves towards the higher frequency when said frequency increases.
Claim 11
Dependent Claim
18 words
Device according to claim 9, wherein said cross-circuit has a low pass filter network and a derivating network.
Claim 12
Dependent Claim
348 words
Device having : a member rotatable about an axis thereof, two axially aligned magnetic bearing assemblies, each having first biasing means for exerting a biasing force on said member having a component along said axis and a component along a first direction transverse to said axis when energized and second biasing means for exerting a biasing force on said member having a component along said axis and a component along a second direction transverse to said axis and said first direction when energized, first and second detector means in each said bearing for providing signals representative of radial deflections of the axis of said member from the common axis of said bearings in said first and second directions, third detector means for providing signals representative of axial deflections of said member from a predetermined position, and feed-back means responsive to said signals for controlling said biasing means, said feed-back means comprising, for each of said directions in each bearing assembly : first summing means for summing the signals from said first detector means associated with one of said bearings and the signals from said third detector means and for applying correction signals to the first biasing means of said associated bearing assembly which increases with the summed signals, first subtracting means for subtracting the signals from said first detector means associated with the other one of said bearings and the signals from said third detector means and for applying correction signals to the first biasing means of the associated bearings which increases with the subtracted signals, second summing means for summing the signals from said second detector means associated with the first one of said bearings and the signals from said third detector means and for applying correction signals to the second biasing means of the associated bearing which increases with said summed signals, and second subtracting means for subtracting the signals from said second detector means associated with said other bearing and the signals from said detector means and for applying correction signals to the second biasing means oF the associated bearing which increases with said difference.
Claim 13
Dependent Claim
348 words
Device having : a member rotatable about an axis thereof, two axially aligned magnetic bearing assemblies, each having first biasing means for exerting a biasing force on said member having a component along said axis and a component along a first direction transverse to said axis when energized and second biasing means for exerting a biasing force on said member having a component along said axis and a component along a second direction transverse to said axis and said first direction when energized, first and second detector means in each said bearing for providing signals representative of radial deflections of the axis of said member from the common axis of said bearings in said first and second directions, third detector means for providing signals representative of axial deflections of said member from a predetermined position, and feed-back means responsive to said signals for controlling said biasing means, said feed-back means comprising, for each of said directions in each bearing assembly : first summing means for summing the signals from said first detector means associated with one of said bearings and the signals from said third detector means and for applying correction signals to the first biasing means of said associated bearing assembly which increases with the summed signals, first subtracting means for subtracting the signals from said first detector means associated with the other one of said bearings and the signals from said third detector means and for applying correction signals to the first biasing means of the associated bearings which increases with the subtracted signals, second summing means for summing the signals from said second detector means associated with the first one of said bearings and the signals from said third detector means and for applying correction signals to the second biasing means of the associated bearing which increases with said summed signals, and second subtracting means for subtracting the signals from said second detector means associated with said other bearing and the signals from said detector means and for applying correction signals to the second biasing means oF the associated bearing which increases with said difference.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |