US3741613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic levitation guide
Assignee: Siemens AG
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Filing: 1971-07-14
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Granted: 1973-06-26
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Expires: 1991-07-14
Abstract
Abstract An electromagnetic levitation guide for a movable body has at least one direct-current magnet to hold the body in levitation. A ferromagnetic rail is arranged along the travel path of the body at a constant spacing from the magnet, whereby the rail constitutes the armature return for the flux developed by the magnet. The magnet has a core having pole faces and the armature return also has pole faces; these pole faces are long and narrow and extend longitudinally in the direction of the travel path.
Inventors
- 👤 C Pfaler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:39
CPC Classifications
B; B60; B60L; B60L13/00; B60L13/04; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
Electromagnetic levitation guide for a movable body, comprising at least one direct-current magnet to hold the body in levitation, a ferromagnetic rail arranged along the travel path of said body at a constant spacing from said magnet, whereby said rail constitutes the armature return for the flux developed by said magnet, said magnet comprising a core having pole faces and said armature returns having pole faces, said pole faces being elongated and extending longitudinally in the direction of said travel path, the length of each of said pole faces being at least fifty times its width.
Claim 2
Dependent Claim
96 words
Electromagnetic levitation guide for a movable body, comprising at least one direct-current magnet to hold the body in levitation, a ferromagnetic rail arranged along the travel path of said body at a constant spacing from said magnet, whereby said rail constitutes the armature return for the flux developed by said magnet, said magnet comprising a core having pole faces and said armature returns having pole faces, said pole faces being elongated and extending longitudinally in the direction of said travel path, the length of each of said pole faces being at least fifty times its width.
Claim 3
Dependent Claim
35 words
Electromagnetic levitation guide according to claim 1, said core being U-shaped, and said armature return being profiled to have a U shape and arranged to be at least approximately the mirror image of said magnet.
Claim 4
Dependent Claim
111 words
Electromagnetic levitation guide for a movable body, comprising at least one direct-current magnet to hold the body in levitation, a ferromagnetic rail arranged along the travel path of said body at a constant spacing from said magnet, whereby said rail constitutes the armature return for the flux developed by said magnet, said magnet comprising a core having pole faces and said armature returns having pole faces, said pole faces being elongated and extending longitudinally in the direction of the travel path, said core having slot means, said magnet comprising a plurality of coils aligned serially next to each other in said slot means, and closing means for closing said slot means.
Claim 5
Dependent Claim
111 words
Electromagnetic levitation guide for a movable body, comprising at least one direct-current magnet to hold the body in levitation, a ferromagnetic rail arranged along the travel path of said body at a constant spacing from said magnet, whereby said rail constitutes the armature return for the flux developed by said magnet, said magnet comprising a core having pole faces and said armature returns having pole faces, said pole faces being elongated and extending longitudinally in the direction of the travel path, said core having slot means, said magnet comprising a plurality of coils aligned serially next to each other in said slot means, and closing means for closing said slot means.
Claim 6
Dependent Claim
48 words
Electromagnetic levitation guide according to claim 3, said magnet comprising a plurality of core components having respective individual coils, said core components having respective sets of pole faces, said components being placed together so that the respective interfaces between mutually adjacent components do not constitute functioning air gaps.
Claim 7
Dependent Claim
17 words
Electromagnetic levitation guide according to claim 4, said magnet comprising ancillary coil means arranged over said coils.
Claim 8
Dependent Claim
105 words
Electromagnetic levitation guide for a movable body, comprising at least one direct-current magnet to hold the body in levitation, a ferromagnetic rail arranged along the travel path of said body at a constant spacing from said magnet, whereby said rail constitutes the armature return for the flux developed by said magnet, said magnet comprising a core having pole faces and said armature returns having pole faces, said pole faces being elongated and extending longitudinally in the direction of said travel path, the respective widths of said core, of said armature return and of said pole faces being dimensioned to be at least approximately the same.
Claim 9
Dependent Claim
105 words
Electromagnetic levitation guide for a movable body, comprising at least one direct-current magnet to hold the body in levitation, a ferromagnetic rail arranged along the travel path of said body at a constant spacing from said magnet, whereby said rail constitutes the armature return for the flux developed by said magnet, said magnet comprising a core having pole faces and said armature returns having pole faces, said pole faces being elongated and extending longitudinally in the direction of said travel path, the respective widths of said core, of said armature return and of said pole faces being dimensioned to be at least approximately the same.
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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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |