US4779538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Levitation-propulsion mechanism for inductive repulsion type magnetically levitated railway
Assignee: Railway Technical Research Institute
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Filing: 1987-12-16
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Granted: 1988-10-25
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Expires: 2007-12-16
Abstract
Abstract A levitation-propulsion mechanism for an inductive repulsion type magnetically levitated railway having a vehicle with a truck and a track with a U-shaped cross-section with spaced opposed walls between which the truck runs, has a plurality of vertically positioned superconducting coils on both sides of the truck at intervals therealong in the direction of travel of the vehicle. Guidance coils are mounted on the inside surfaces of the walls of the track at intervals therealong in the direction of travel of the vehicle and opposed to the corresponding superconducting coils. Upper and lower levitation coils are positioned adjacent to the guidance conductor coils and opposed to the superconducting coils, the upper and lower coils being symmetrically positioned above and below, respectively, a horizontal line through the center of the guidance coils, and the upper and lower conductor coils are null-flux connected in a closed circuit. The guidance coils can be connected to a propulsion power source, in which case they become propulsion-guidance coils. Alternatively the levitation coils can be connected to the propulsion power source, in which case they become levitation-propulsion coils.
Inventors
- 👤 Shunsuke Fujiwara
- 👤 Junji Fujie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:21
CPC Classifications
B; B60; B60L; B60L13/00; B60L13/10; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
170 words
A levitation-propulsion mechanism for an inductive repulsion type magnetically levitated railway having a vehicle with a truck and a track with a U-shaped cross-section with spaced opposed walls between which said truck runs, comprising: a plurality of vertically positioned superconducting coils on both sides of said truck at intervals therealong in the direction of travel of the vehicle; propulsion-guidance coils mounted on the inside surfaces of the walls of said track at intervals therealong in the direction of travel of the vehicle and opposed to the corresponding superconducting coils; a propulsion power source; said propulsion-guidance conductor coils opposite each other on opposite sides of said track being null-flux connected and connected to said propulsion power source; and upper and lower levitation coils adjacent to said propulsion-guidance conductor coils and opposed to said superconducting coils, said upper and lower coils being symmetrically positioned above and below, respectively, a horizontal line through the center of said propulsion-guidance coils, and said upper and lower conductor coils being null-flux connected in a closed circuit.
Claim 2
Dependent Claim
170 words
A levitation-propulsion mechanism for an inductive repulsion type magnetically levitated railway having a vehicle with a truck and a track with a U-shaped cross-section with spaced opposed walls between which said truck runs, comprising: a plurality of vertically positioned superconducting coils on both sides of said truck at intervals therealong in the direction of travel of the vehicle; propulsion-guidance coils mounted on the inside surfaces of the walls of said track at intervals therealong in the direction of travel of the vehicle and opposed to the corresponding superconducting coils; a propulsion power source; said propulsion-guidance conductor coils opposite each other on opposite sides of said track being null-flux connected and connected to said propulsion power source; and upper and lower levitation coils adjacent to said propulsion-guidance conductor coils and opposed to said superconducting coils, said upper and lower coils being symmetrically positioned above and below, respectively, a horizontal line through the center of said propulsion-guidance coils, and said upper and lower conductor coils being null-flux connected in a closed circuit.
Claim 3
Dependent Claim
185 words
A levitation-propulsion mechanism for an inductive repulsion type magnetically levitated railway having a vehicle with a truck and a track with a U-shaped cross-section with spaced opposed walls between which said truck runs, comprising: a plurality of vertically positioned superconducting coils on both sides of said truck at intervals therealong in the direction of travel of the vehicle; guidance coils mounted on the inside surfaces of the walls of said track at intervals therealong in the direction of travel of the vehicle and opposed to the corresponding superconducting coils, said guidance conductor coils opposite each other on opposite sides of said track being null-flux connected; a propulsion power source; upper and lower propulsion-levitation conductor coils adjacent to said guidance conductor coils and opposed to said superconducting coils, said upper and lower propulsion-levitation conductor coils being symmetrically positioned above and below, respectively, a horizontal line through the center of said guidance coils, and said upper and lower propulsion-levitation conductor coils being null-flux connected in a closed circuit and further being connected to said power source for having current flow in the same direction therein for propulsion.
Claim 4
Dependent Claim
185 words
A levitation-propulsion mechanism for an inductive repulsion type magnetically levitated railway having a vehicle with a truck and a track with a U-shaped cross-section with spaced opposed walls between which said truck runs, comprising: a plurality of vertically positioned superconducting coils on both sides of said truck at intervals therealong in the direction of travel of the vehicle; guidance coils mounted on the inside surfaces of the walls of said track at intervals therealong in the direction of travel of the vehicle and opposed to the corresponding superconducting coils, said guidance conductor coils opposite each other on opposite sides of said track being null-flux connected; a propulsion power source; upper and lower propulsion-levitation conductor coils adjacent to said guidance conductor coils and opposed to said superconducting coils, said upper and lower propulsion-levitation conductor coils being symmetrically positioned above and below, respectively, a horizontal line through the center of said guidance coils, and said upper and lower propulsion-levitation conductor coils being null-flux connected in a closed circuit and further being connected to said power source for having current flow in the same direction therein for propulsion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |