Patent EP0411696A2 successfully refreshed from Google Patents.
EP0411696A2
Expired / Lapsed
EP
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Magnetic thrust bearings
Assignee: Federal Mogul Engineering Ltd
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Filing: 1990-07-25
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Granted: —
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Expires: 2010-07-25
Abstract
Abstract Axial magnetic bearings are described suitable for use where high loads and high rotational speeds are found together. In an axial magnetic bearing, for thrusts along the shaft (31) in one direction, there are included, in relation to the shaft (31), a generally radially extending thrust accepting face (38,43); and an electromagnet (37), with a face of each pole (36) thereof parallel to, but spaced from, an individually associated portion of the thrust face (38,43). The rotor disc (32) is tapered in the radially outward direction, to reduce the mass of the disc (32). Thus, the two said portions of the thrust face (38,43) are radially separated, and are separated from each other along the axis of the shaft (31). Possibly, the two said portions of the thrust face (38,43) extend precisely radially, between the portions there being a part of the thrust face (38,43) in the shape of a truncated cone.
Inventors
- 👤 Nigel Henry New
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 11:51
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0459; F16C32/0474; F16C32/0476
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
184 words
An axial magnetic bearing has a shaft, and, secured to the shaft, a rotor disc of ferromagnetic material which provides, in relation to the shaft axis, at least one generally radially extending face to accept thrusts along the shaft in one direction, the rotor disc being tapered in the radially outward direction, characterised by, the, or each, thrust accepting face of the rotor disc having the shape, at least generally that, of a truncated cone, and the magnetic bearing has a structure including at least one electromagnet, the poles of the, or each, electromagnet each has a face opposite to, and spaced from, an associated portion of the thrust face, each such pole face having a shape complementary to that of the associated portion of the thrust face, the arrangement being such that there are two such portions of the thrust face, and one portion is radially outwardly of the other portion, each portion is associated individually with one of the two said pole faces of the, or each, electromagnet, and the two portions separated from each other along the axis of the shaft.
Claim 2
Dependent Claim
184 words
An axial magnetic bearing has a shaft, and, secured to the shaft, a rotor disc of ferromagnetic material which provides, in relation to the shaft axis, at least one generally radially extending face to accept thrusts along the shaft in one direction, the rotor disc being tapered in the radially outward direction, characterised by, the, or each, thrust accepting face of the rotor disc having the shape, at least generally that, of a truncated cone, and the magnetic bearing has a structure including at least one electromagnet, the poles of the, or each, electromagnet each has a face opposite to, and spaced from, an associated portion of the thrust face, each such pole face having a shape complementary to that of the associated portion of the thrust face, the arrangement being such that there are two such portions of the thrust face, and one portion is radially outwardly of the other portion, each portion is associated individually with one of the two said pole faces of the, or each, electromagnet, and the two portions separated from each other along the axis of the shaft.
Claim 3
Dependent Claim
22 words
An axial magnetic bearing according to claim 1, characterised in that the thrust face has precisely the shape of a truncated cone.
Claim 4
Dependent Claim
67 words
An axial magnetic bearing according to claim 1, characterised in that the two said portions of the thrust face extend precisely radially, and each is opposite to, and spaced from, an individually associated precisely radially extending pole face of the, or each, electromagnet of the structure, and between the two said portions, there is a part of the thrust face having the shape of a truncated cone.
Claim 5
Dependent Claim
52 words
An axial magnetic bearing according to any one preceding claim, characterised in that the mean axial width of each of the two parts of the rotor disc providing the two said portions of the thrust face is, at least substantially, equal to the radial width of the, or each, associated pole face.
Claim 6
Dependent Claim
79 words
An axial magnetic bearing according to any one preceding claim, characterised in that the product of the mean axial width of either one of the two parts of the rotor disc providing the two said portions of the thrust face, and the mean radial spacing of said one part of the rotor disc from the axis of the shaft, is, at least substantially, the same as the corresponding product associated with the other such part of the rotor disc.
Claim 7
Dependent Claim
37 words
An axial magnetic bearing according to any one preceding claim, characterised in that the shaft is of ferromagnetic material, and said at least one thrust face is provided by a rotor disc machined from the shaft material.
Claim 8
Dependent Claim
29 words
An axial magnetic bearing according to any one preceding claim, characterised in that said at least one thrust face is provided by a rotor disc secured to the shaft.
Claim 9
Dependent Claim
77 words
An axial magnetic bearing according to any one preceding claim, characterised in that there are two structures each having at least one electromagnet, and which structures are arranged to be able to provide axial forces in opposition to each other, and the tapered rotor disc has two generally radially extending faces, each such face to accept thrusts along the shaft in the opposite direction to that in relation to which the other face is to accept thrusts.
References Cited (Backward Citations)
No citation records indexed.
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