US3845997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic bearing assembly for journalling a rotor in a stalor
Assignee: Padana AG
•
Filing: 1973-03-19
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Granted: 1974-11-05
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Expires: 1993-03-19
Abstract
Abstract The invention provides a magnetic bearing assembly for journalling a rotor which is at least partly ferromagnetic in a stator, the bearing assembly being able to absorb transverse forces acting on the rotor. The assembly includes radial bearing means holding the rotor on a desired axis of rotation and at least one magnet. An air gap is defined between the rotor and the magnet in which a magnetic field is set up. The magnetic field has a first magnetic field component which is constant around the periphery of the air gap and on which is superimposed a second magnetic field component which varies around the periphery of the air gap to absorb the transverse forces.
Inventors
- 👤 K Boden
- 👤 W Geweke
- 👤 D Scheffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:12
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0474; F16C32/0444; H; H02; H02K; H02K7/00; H02K7/08; H02K7/09; F16C2340/00; F16C2340/18
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
147 words
A magnetic bearing assembly for journalling in a stator a rotor subject to a steady force in a direction transverse to its rotational axis and having ferromagnetic portions comprising radial bearing means cooperating with said ferromagnetic portions for holding the rotor on a desired axis of rotation, means for controlling said radial bearing means, an annular air gap being defined between said rotor and said bearing means, and magnetic means for generating a magnetic field within said air gap, said magnetic means having a first magnetic field component which is constant in radial directions around the periphery of the air gap, and a second magnetic field component superimposed on said first magnetic field component, said second magnetic field component varying in radial directions around the periphery of the air gap and generating a constant force acting in opposition to the steady transverse forces acting on the rotor.
Claim 2
Dependent Claim
147 words
A magnetic bearing assembly for journalling in a stator a rotor subject to a steady force in a direction transverse to its rotational axis and having ferromagnetic portions comprising radial bearing means cooperating with said ferromagnetic portions for holding the rotor on a desired axis of rotation, means for controlling said radial bearing means, an annular air gap being defined between said rotor and said bearing means, and magnetic means for generating a magnetic field within said air gap, said magnetic means having a first magnetic field component which is constant in radial directions around the periphery of the air gap, and a second magnetic field component superimposed on said first magnetic field component, said second magnetic field component varying in radial directions around the periphery of the air gap and generating a constant force acting in opposition to the steady transverse forces acting on the rotor.
Claim 3
Dependent Claim
32 words
A magnetic bearing assembly according to claim 1 in which said means for setting up the magnetic field comprises at least one magnet for producing magnetic forces acting radially on said rotor.
Claim 4
Dependent Claim
18 words
A bearing assembly according to claim 2, in which the magnet is an annular magnet surrounding the rotor.
Claim 5
Dependent Claim
17 words
A bearing assembly according to claim 2, in which the magnet acts as an axially stabilizing magnet.
Claim 6
Dependent Claim
26 words
A bearing assembly according to claim 4, in which at least one further magnet is provided in addition to the magnets acting as axially stabilizing magnets.
Claim 7
Dependent Claim
36 words
A bearing assembly according to claim 2, in which said radial bearing means is electromagnetic and in which the magnet has its magnetic field disposed to provide a magnetic bias for the electromagnetic radial bearing means.
Claim 8
Dependent Claim
23 words
A bearing assembly according to claim 6, in which the magnet is connected to the radial bearing means to form a structural unit.
Claim 9
Dependent Claim
53 words
A bearing assembly according to claim 6, in which the rotor Is fully journalled in the stator by means of two spaced units arranged on the rotor, each unit comprising a magnet and a radial bearing means, and in which at least one end of the rotor cooperates with one of said units.
Claim 10
Dependent Claim
57 words
A bearing assembly according to claim 6, in which the rotor is fully journalled in the stator by means of two spaced units arranged on the rotor, each unit comprising a magnet and a radial bearing means, and in which at least one shoulder of the ferromagnetic material of the rotor cooperates with one of said units.
Claim 11
Dependent Claim
41 words
A bearing assembly according to claim 1, in which the desired axis of rotation of the rotor is displaced relative to the centre of the first magnetic field component in the opposite direction to the effective direction of the transverse force.
Claim 12
Dependent Claim
50 words
A bearing assembly according to claim 1, in which the air gap defined between the rotor and said bearing means is of varying thickness, the thickness of the air gap being least at the side of the air gap opposed to the direction in which the transverse force is effective.
Claim 13
Dependent Claim
24 words
A bearing assembly according to claim 2, in which the magnet has a non-uniform magnetic field strength around the periphery of the air gap.
Claim 14
Dependent Claim
15 words
A bearing assembly according to claim 2, in which the magnet is a permanent magnet.
Claim 15
Dependent Claim
22 words
A bearing assembly according to claim 13, in which the magnet comprises at least one permanent annular magnet having an eccentric bore.
Claim 16
Dependent Claim
24 words
A bearing assembly according to claim 14, in which the magent is made from material which is magnetized with non-uniform strength around the periphery.
Claim 17
Dependent Claim
18 words
A bearing assembly according to claim 15, in which the dimensions of the magnet vary around the periphery.
Claim 18
Dependent Claim
47 words
A bearing assembly according to claim 13, in which the magnet comprises a plurality of permanent annular magnets each having an eccentric bore, the centers of the bores of certain of said magnets being radially displaced from the centers of the bores of other of said magnets.
Claim 19
Dependent Claim
14 words
A bearing assembly according to claim 2, in which the magnet is an electromagnet.
Claim 20
Dependent Claim
16 words
A bearing assembly according to claim 2, in which the magnet carries eccentrically arranged pole shoes.
Claim 21
Dependent Claim
22 words
A bearing assembly according to claim 2, in which a magnetic short circuit member is arranged on the periphery of the magnet.
Claim 22
Dependent Claim
22 words
A bearing assembly according to claim 2, in which the radial bearing means and the magnet are offset relative to each other.
Claim 23
Dependent Claim
16 words
A bearing assembly according to claim 1, in which the second magnetic field component vanes uniformly.
Claim 24
Dependent Claim
41 words
A bearing assembly according to claim 18, in which the electromagnet is fed with alternating current and is spatially and functionally coupled to coils which effect radial stabilization of the desired axis of rotation in the manner of alternating voltage bearings.
Claim 25
Dependent Claim
50 words
A bearing assembly according to claim 1, in which the amplitude of the second magnetic field component is smaller than the amplitude of the first magnetic field component so that the magnetic field in the air gap does not change its polarity in the peripheral direction of the air gap.
Claim 26
Dependent Claim
87 words
A bearing assembly according to claim 8, in which the desired axis of rotation is displaced relative to the centre of the first magnetic field component in the opposite direction to the effective direction of the transverse force, in which the magnet is a permanent annular magnet, and in which the amplitude of the second magnetic field component is smaller than the amplitude of the first magnetic field component so that the magnetic field does not change to polarity in the peripheral direction of the air gap.
Claim 27
Dependent Claim
74 words
A bearing assembly according to claim 8, in which the air gap defined between the rotor and the magnet is of varying thickness, the thickness of the air gap being least at the side of the air gap opposed to the direction in which the transverse force is effective, in which the magnet comprises a permanent annular magnet having an eccentric bore, and in which the dimensioNs of the magnet vary around the periphery.
Claim 28
Dependent Claim
73 words
A bearing assembly according to claim 9, in which the air gap defined between the rotor and the magnet is of varying thickness, the thickness of the air gap being least at the side of the air gap opposed to the direction in which the transverse force is effective, and in which the magnet comprises two permanent annular magnets each having an eccentric bore and which can be turned relative to each other.
Claim 29
Dependent Claim
21 words
A bearing assembly according to claim 9, in which the magnet is a permanent annular magnet carrying eccentrically arranged pole shoes.
Claim 30
Dependent Claim
25 words
A bearing assembly according to claim 9, in which the magnet is a permanent annular magnet carrying a magnet short circuit member on its periphery.
Claim 31
Dependent Claim
42 words
A bearing assembly according to claim 9, in which the magnet is an electromagnet fed with alternating current and spatially and functionally coupled to coils which effect radial stabilization of the desired axis of rotation in the manner of alternating voltage bearings.
References Cited (Backward Citations)
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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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |