US4245869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic bearings
Assignee: Padana AG
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Filing: 1978-08-07
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Granted: 1981-01-20
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Expires: 1998-08-07
Abstract
Abstract An electromagnetic bearing system for a movable (usually rotatable) member on a stationary member has bearing coils wound on a core for producing a magnetic field for supporting the movable member. High frequency sensor currents are applied to the bearing coils or to separate sensor coils on the same core or core portion as the bearing coils. The sensor currents produce signals responsive to deviation of the movable member from a desired position in which it is to be supported. These signals are amplified to provide bearing currents which are fed to the bearing coils.
Inventors
- 👤 Dietrich Scheffer
- 👤 Rolf Guse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:26
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0474; F16C32/048; F16C32/0444; F16C32/0446; F16C32/0448
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
187 words
In an electro-magnetic bearing system for supporting a movable member relative to a stationary member; at least one bearing element which includes at least a one core, and electro-magnetic coil means wound on said one core, means for passing high frequency sensor currents through at least part of said coil means on said one core, said sensor currents being influenced by movements of said movable member relative to said stationary member in the region of said bearing element, and means including at least one regulating device for producing bearing currents through said electro-magnetic coil means on said one core responsive to said variations in said sensor currents and for applying said bearing currents to at least part of said coil means on said one core, said bearing currents being direct currents which are variable in response to said sensor currents to produce a magnetic flux extending through at least the portion of said core encircled by said coil means and into said movable member to support the latter and whereby said electro-magnetic coil means acts both as a sensor and as a means for producing bearing forces.
Claim 2
Dependent Claim
187 words
In an electro-magnetic bearing system for supporting a movable member relative to a stationary member; at least one bearing element which includes at least a one core, and electro-magnetic coil means wound on said one core, means for passing high frequency sensor currents through at least part of said coil means on said one core, said sensor currents being influenced by movements of said movable member relative to said stationary member in the region of said bearing element, and means including at least one regulating device for producing bearing currents through said electro-magnetic coil means on said one core responsive to said variations in said sensor currents and for applying said bearing currents to at least part of said coil means on said one core, said bearing currents being direct currents which are variable in response to said sensor currents to produce a magnetic flux extending through at least the portion of said core encircled by said coil means and into said movable member to support the latter and whereby said electro-magnetic coil means acts both as a sensor and as a means for producing bearing forces.
Claim 3
Dependent Claim
29 words
A bearing system according to claim 1, in which said coil means comprise single coils through which both said bearing currents and said sensor currents are adapted to flow.
Claim 4
Dependent Claim
45 words
A bearing system according to claim 1, in which said coil means comprise separate bearing and sensor coils each surrounding the core, said sensor currents being adapted to flow through said sensor coils and said bearing currents being adapted to flow through said bearing coils.
Claim 5
Dependent Claim
35 words
A bearing system according to claim 1, in which the core comprises at least six poles said coil means comprises at least six coils each serving a separate pole connected and arranged as separate coils.
Claim 6
Dependent Claim
34 words
A bearing system according to claim 1, in which the core comprises at least eight poles said coil means comprises eight coils each surrounding a respective pole and connected and arranged as separate coils.
Claim 7
Dependent Claim
42 words
A bearing system according to claim 4, in which said core defines at least six separate poles and said coils. means includes at least one bearing coil being wound around each said pole, said bearing currents being applied to said bearing coil.
Claim 8
Dependent Claim
46 words
A bearing system according to claim 1, including means connecting said coils to said regulating device cancels electro-magnetic influence of the sensor currents on the bearing currents in the particular branch associated with a degree of freedom in which the movable member is to be supported.
Claim 9
Dependent Claim
35 words
A bearing system according to claim 5, in which said core defines eight poles and said coil means includes coil means associated with each said pole, said bearing currents being applied to said coil means.
Claim 10
Dependent Claim
45 words
A bearing system according to claim 8, in which said poles form pairs of poles which are influenced by said bearing currents in said coil means to form like bearing poles and by said sensor currents in said coil means to form unlike sensor poles.
Claim 11
Dependent Claim
15 words
A bearing system according to claim 8, in which said bearing element has individual poles.
Claim 12
Dependent Claim
50 words
A bearing system according to claim 1, in which said core comprises an annular core and said coil means is wound toroidally on said annular core and is divided to define bearing coils, said bearing currents being applied to said bearing coils to produce different and/or opposingly directed magnetic fluxes.
Claim 13
Dependent Claim
47 words
A bearing system according to claim 11, in which each said bearing coil is divided to define two adjoining spatially separate regions and said sensor currents are applied to said bearing coils so that said separate regions thereof have different polarity with respect to the sensor currents.
Claim 14
Dependent Claim
30 words
A bearing system according to claim 11, in which said coil means further comprises sensor coils of which two are arranged on the annular core adjacent each said bearing coil.
Claim 15
Dependent Claim
17 words
A bearing system according to claim 11, in which said annular core comprises individual circumferential core portions.
Claim 16
Dependent Claim
31 words
A bearing system according to claim 14, in which said annular core includes substantially straight limbs on which said coil means is wound pole-shoe defining portions between said substantially straight lims.
Claim 17
Dependent Claim
32 words
A bearing system according to claim 1, further comprising electrical filter means associated with said coil means for separating the high-frequency sensor currents from the bearing currents of relatively low frequency ripple.
Claim 18
Dependent Claim
23 words
A bearing system according to claim 1, in which said regulating device includes alternating voltage preamplifier means for preamplifying said high-frequency sensor currents.
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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) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |