Patent US3783794A successfully refreshed from Google Patents.
US3783794A
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Magnetic suspension system for vehicles and the like with non controlled suspending magnets
Assignee: Mannesmann Demag Krauss Maffei GmbH
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Filing: 1972-07-24
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Granted: 1974-01-08
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Expires: 1992-07-24
Abstract
Abstract A magnetic-suspension system for vehicles and the like adapted to travel along a track provided with a fixed armature rail of magnetically permeable-ferromagnetic-material. The suspended vehicle comprises, on a portion of the vehicle confronting the rail and therebelow, controlled electromagnets which regulate the suspension force and, adjacent the controlled electromagnets and preferably alternating therewith, uncontrolled suspending magnets which provide a substantial proportion of the suspension force.
Inventors
- 👤 M Gopfert
- 👤 R Gebhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:30
CPC Classifications
F; F16; F16C; F16C39/00; F16C39/06; F16C39/063; B; B60; B60L; B60L13/00; B60L13/04; B61; B61B; B61B13/00; B61B13/08; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0472; B60L2200/00; B60L2200/26; F16C2326/00; F16C2326/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
91 words
A magnetic suspension system comprising: an elongated support; a magnetically permeable armature rail mounted on said support and extending therealong; a supported body; and a magnetic means on said supported body juxtaposed with said rail and magnetically attracting same to suspend said body from said rail, said magnetic means comprising: electromagnetic means energizable to attract said body, uncontrolled support-magnetic means cooperating with said rail to provide a substantial supporting force for said body, and means for controlling said electromagnetic means to adjust the attraction of said magnetic means to said rail.
Claim 2
Dependent Claim
91 words
A magnetic suspension system comprising: an elongated support; a magnetically permeable armature rail mounted on said support and extending therealong; a supported body; and a magnetic means on said supported body juxtaposed with said rail and magnetically attracting same to suspend said body from said rail, said magnetic means comprising: electromagnetic means energizable to attract said body, uncontrolled support-magnetic means cooperating with said rail to provide a substantial supporting force for said body, and means for controlling said electromagnetic means to adjust the attraction of said magnetic means to said rail.
Claim 3
Dependent Claim
19 words
The system defined in claim 1 wherein said uncontrolled magnet is a sinter magnet composed of a samarium-containing material.
Claim 4
Dependent Claim
59 words
The system defined in claim 1 wherein said electromagnetic means includes at least one electromagnet and said uncontrolled magnetic means includes a further magnet spaced from said electromagnet along said support, said further magnet having a pole piece spaced from said rail by a distance greater than the distance between the pole pieces of said electromagnet and said rail.
Claim 5
Dependent Claim
58 words
The system defined in claim 1 wherein said electromagnetic means consists of a plurality of spaced apart electromagnets energized by a source, said uncontrolled magnetic means including permanent magnets disposed between said electromagnets and in the flux fields thereof, and means for reversing the polarity of said source to selectively add and remove flux at said permanent magnets.
Claim 6
Dependent Claim
23 words
The system defined in claim 2 wherein said electromagnetic means and said uncontrolled magnetic means each include respective magnets alternating along said body.
Claim 7
Dependent Claim
37 words
The system defined in claim 2 wherein said body is a vehicle and said support is a track, two such rails and respective magnetic means being provided on opposite sides of a median plane between said rails.
Claim 8
Dependent Claim
16 words
The system defined in claim 6 wherein said uncontrolled magnetic means includes a sintered-metal permanent magnet.
Claim 9
Dependent Claim
14 words
The system defined in claim 7 wherein said permanent magnet is a samarium-containing magnet.
Claim 10
Dependent Claim
18 words
The system defined in claim 8 further comprising flux-reinforcing yokes abutting said permanent magnets and confronting said rail.
Claim 11
Dependent Claim
16 words
The system defined in claim 9 wherein said permanent magnets and said electromagnets have overlapping-flux-magnetic poles.
References Cited (Backward Citations)
US3611944A
Cited
US3589300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |