US3890019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic bearings
Assignee: Padana AG
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Filing: 1973-03-19
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Granted: 1975-06-17
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Expires: 1993-03-19
Abstract
Abstract A magnetic bearing is provided with two, at least partly separated, flux paths; one for the magnetic field of a permanent magnet and the other for the magnetic field of an electrical winding. The electromagnetic flux path includes a ferromagnetic part having a high permeability so that the electromagnetic field can be varied with the use of a relatively low input energy to the electrical winding. In some embodiments the two fields are superimposed upon one another in two air gaps between the bearing and the body to be supported such that the electromagnetic field is added to the permanent magnetic field in one gap, but is subtracted in the other gap. In other embodiments both flux paths pass through the ferromagnetic part which is so dimensioned relative to the permanent magnet that the magnetic field of the latter drives the ferromagnetic part into its range of magnetic saturation. The ferromagnetic part thereby offers low reluctance to the electromagnetic field. The invention is applicable to linear bearings, axial bearings and radial rotary bearings.
Inventors
- 👤 Karl Boden
- 👤 Dietrich Scheffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:56
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0459; F16C32/0461; F16C32/0465; F16C32/0474; F16C32/0476
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
112 words
In a magnetic bearing for a body having a ferromagnetic portion: first means defining a first flux path; at least one permanent magnet in said first flux path and producing a magnetic field therein; second means defining a second flux path; said second flux path being non-coincident with said first path for a substantial portion of its length, a ferromagnetic part in said second flux path; an electromagnet winding for producing a magnetic field in said second flux path, said ferromagnetic part offering a high permeability to the last-mentioned magnetic field; and means for controlling electric current supplied to said winding to apply a controlled magnetic field to said ferromagnetic body portion.
Claim 2
Dependent Claim
112 words
In a magnetic bearing for a body having a ferromagnetic portion: first means defining a first flux path; at least one permanent magnet in said first flux path and producing a magnetic field therein; second means defining a second flux path; said second flux path being non-coincident with said first path for a substantial portion of its length, a ferromagnetic part in said second flux path; an electromagnet winding for producing a magnetic field in said second flux path, said ferromagnetic part offering a high permeability to the last-mentioned magnetic field; and means for controlling electric current supplied to said winding to apply a controlled magnetic field to said ferromagnetic body portion.
Claim 3
Dependent Claim
19 words
A bearing according to claim 1 in which said second flux path does not pass through said permanent magnet.
Claim 4
Dependent Claim
23 words
A bearing according to claim 1 in which said control means is adapted to reverse the magnetic field in said second flux path.
Claim 5
Dependent Claim
31 words
A bearing according to claim 1 in which said body is rotatable and in which said bearing is an axial bearing, said control means being adapted to axially control said body.
Claim 6
Dependent Claim
11 words
A bearing according to claim 1 which is a linear bearing.
Claim 7
Dependent Claim
45 words
A bearing according to claim 1 in which said body and said bearing define two gaps therebetween, at least said second flux path including said flux paths, said gaps being effective in opposite directions, whereby different strength magnetic forces may be applied to said body.
Claim 8
Dependent Claim
18 words
A bearing according to claim 6 in which said two air gaps define planes parallel to one another.
Claim 9
Dependent Claim
37 words
A bearing according to claim 5 in which said first means defines two separate flux paths each with a permanent magnet therein, each of said two separate flux paths including a respective one of said two gaps.
Claim 10
Dependent Claim
44 words
A bearing according to claim 1 in which said body and said bearing define two gaps therebetween, said first and second flux paths each including portions in both of said gaps, which portions are substantially parallel to one another where they are commonly situated.
Claim 11
Dependent Claim
76 words
A bearing according to claim 1 in which said first means includes two ferromagnetic parts, the field of said permanent magnet at least partly magnetizing said ferromagnetic parts into their region of magnetic saturation, said second means also including said ferromagnetic parts, the field of said electromagnet winding being in the same direction as the field of said permanent magnet in one of said parts but in the opposite direction in the other of said parts.
Claim 12
Dependent Claim
30 words
A bearing according to claim 10 which includes at least two permanent magnets in said first flux path, said permanent magnets being disposed side-by-side with opposite poles adjacent one another.
Claim 13
Dependent Claim
31 words
A bearing according to claim 11 in which said permanent magnets are arranged next to one another in relation to the direction of movement of said body relative to said bearing.
Claim 14
Dependent Claim
29 words
A bearing according to claim 11 in which said ferromagnetic parts comprise plates arranged at opposite ends of said permanent magnets and on the pole faces of the latter.
Claim 15
Dependent Claim
69 words
A bearing according to claim 11 which includes a plurality of permanent magnets in said first flux path, said permanent magnets being arranged side-by-side with opposite poles next to one another, and in which said electromagnet winding is divided into sections, each of said winding sections being wound about a respective two adjoining permanent magnets approximately up to the centre thereof, adjacent winding sections being wound in opposite directions.
Claim 16
Dependent Claim
33 words
A bearing according to claim 10 in which said permanent magnet has a strength such that the magnetic field thereof penetrates into a gap defined between said ferromagnetic body portion and said bearing.
Claim 17
Dependent Claim
25 words
A bearing according to claim 1 which is operative in two directions and in which said second means defines but a single second flux path.
Claim 18
Dependent Claim
29 words
A bearing according to claim 11 in which said permanent magnets are comprised by at least one magnet body magnetized as to define two oppositely poled permanent magnets side-by-side.
Claim 19
Dependent Claim
16 words
A bearing according to claim 1 in which said permanent magnet is arranged on said body.
Claim 20
Dependent Claim
11 words
A bearing according to claim 1 which comprises a radial bearing.
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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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |