US3585939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear induction motor for vehicle propulsion
Assignee: Tracked Hovercraft Ltd
•
Filing: 1969-09-25
•
Granted: 1971-06-22
•
Expires: 1989-09-25
Abstract
Abstract A tracked Hovercraft is propelled by a linear induction motor having a stator connected to the vehicle which cooperates with a platelike reaction rail mounted along the length of a corner of the track. The rail is parallel with one track surface and is transverse to the other track surface of the corner. The stator has two interconnected parts on opposite sides of the rail, only one of the stator parts carrying electrically energizable windings with projecting end turns and the other stator part being a block of magnetic material. The block part is disposed on the side of the rail that forms an angle with a track surface. This arrangement enables the stator to be closer to the track and saves expensive reaction rail material.
Inventors
- 👤 Eric Roberts Laithwaite
- 👤 Denys Stanley Bliss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:19
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/025; B; B60; B60L; B60L13/00; B60L13/03; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
188 words
A linear induction motor in combination with a vehicle and a track along which it runs, the track having at least two surfaces which meet at an angle as seen in a transverse cross section, the motor including a stator connected to the vehicle and a platelike reaction rail forming the rotor, in which the improvement comprises: a. the reaction rail is mounted along the length of the track projecting from said angle of the track so that, as seen in a traverse cross section the rail lies in a plane generally parallel to a first of said two track surfaces and transverse to the second of said track surfaces, and b. the stator has two interconnected parts disposed in use on opposite sides of the rail, one of the stator parts only carrying electrically energizable windings with projecting end turns and the other part being a block of magnetic material which forms a part of the magnetic circuit of the motor, the block part of the stator being disposed in use on the side of the rail which forms an angle with the second said track surface.
Claim 2
Dependent Claim
188 words
A linear induction motor in combination with a vehicle and a track along which it runs, the track having at least two surfaces which meet at an angle as seen in a transverse cross section, the motor including a stator connected to the vehicle and a platelike reaction rail forming the rotor, in which the improvement comprises: a. the reaction rail is mounted along the length of the track projecting from said angle of the track so that, as seen in a traverse cross section the rail lies in a plane generally parallel to a first of said two track surfaces and transverse to the second of said track surfaces, and b. the stator has two interconnected parts disposed in use on opposite sides of the rail, one of the stator parts only carrying electrically energizable windings with projecting end turns and the other part being a block of magnetic material which forms a part of the magnetic circuit of the motor, the block part of the stator being disposed in use on the side of the rail which forms an angle with the second said track surface.
Claim 3
Dependent Claim
46 words
The combination as claimed in claim 1 with the block so disposed that if the block were imagined to have projecting end turns similar to the end turns of the other stator part, imaginary end turns of the block would extend through said second track surface.
Claim 4
Dependent Claim
34 words
The combination as claimed in claim 1 in which the rail projects downwardly from a lateral extension on one side of the track, the underneath surface of the extension constituting said second track surface.
Claim 5
Dependent Claim
52 words
The combination as claimed in claim 1 in which the rail projects laterally from the side of the track with the upper face of the rail generally in the plane of the upper surface of the track, said second track surface being constituted by a substantially vertical side surface of the track.
Claim 6
Dependent Claim
32 words
The combination as claimed in claim 1 in which there are two reaction rails one on each side of the track for each of two stators on opposite sides Of the vehicle.
Claim 7
Dependent Claim
22 words
The combination as claimed in claim 1 in which the vehicle is arranged to be supported on said track by gas pressure.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |