US4012083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic bearings
Assignee: Societe Europeenne de Propulsion SEP SA
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Filing: 1975-05-05
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Granted: 1977-03-15
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Expires: 1995-05-05
Abstract
Abstract This invention relates to magnetic bearings and particularly to active magnetic bearings having a very low "friction couple". In accordance with the invention the active magnetic bearing is of the type which has a stator formed by an electromagnetic circuit having at least one pair of north and south poles, and wherein said electromagnetic circuit of said stator includes at least one electromagnet of U-shaped section. The arms of said U form north pole and south poles respectively and the electromagnet is so arranged that the plane of symmetry which separates the north pole from the south pole lies perpendicularly to the axis of rotation of the magnetic bearing.
Inventors
- 👤 Helmut Habermann
- 👤 Maurice Brunet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:51
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0474
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
139 words
A device including a rotor rotatable about an axis and an active magnetic bearing magnetically supporting said rotor for rotation, said magnetic bearing having a stator defining an electromagnetic circuit including at least one electromagnet which, when energized, has a pair of fixed north and south poles, said electromagnet having a U-shaped cross section in a plane including said axis of rotation of the rotor and opening towards said axis of rotation, the parallel extending side portions of said electromagnet forming respectively said fixed north and south poles and being separated by a plane of symmetry which lies perpendicular to said axis of rotation; said rotor having a circumference in the shape of an annulus whose cross section is in the shape of a U, the legs of which radially aligned to face said side portions of said electromagnet.
Claim 2
Independent Claim
139 words
A device including a rotor rotatable about an axis and an active magnetic bearing magnetically supporting said rotor for rotation, said magnetic bearing having a stator defining an electromagnetic circuit including at least one electromagnet which, when energized, has a pair of fixed north and south poles, said electromagnet having a U-shaped cross section in a plane including said axis of rotation of the rotor and opening towards said axis of rotation, the parallel extending side portions of said electromagnet forming respectively said fixed north and south poles and being separated by a plane of symmetry which lies perpendicular to said axis of rotation; said rotor having a circumference in the shape of an annulus whose cross section is in the shape of a U, the legs of which radially aligned to face said side portions of said electromagnet.
Claim 3
Dependent Claim
35 words
A device according to claim 1 wherein the part of the rotor, wherein the lines of force of the electromagnetic field induced by said at least one electromagnet close, is made of grain-oriented laminated plates.
References Cited (Backward Citations)
US3209152A
Cited
US3384427A
Cited
US3523715A
Cited
US3612630A
Cited
US3865442A
Cited
DE2133209A1
Cited
US3890019A
Cited
US3909082A
Cited
US3787100A
Cited
US3937533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |