US3667397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear induction motor secondary member
Assignee: Tracked Hovercraft Ltd
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Filing: 1971-06-25
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Granted: 1972-06-06
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Expires: 1991-06-25
Abstract
Abstract The secondary member in or for a linear induction motor of the single-sided and short stator variety is mounted generally horizontally for co-operation with a linear induction motor primary member carried above it. The secondary member comprises a rolled aluminum reaction plate with downwardly-inclined side edges, and magnetic material which is interposed between the track and the plane central part of the reaction plate. The reaction plate extends beyond the magnetic material along either side, and supports are provided for supporting the overhanging portions from the track inwardly of the downwardly-inclined parts. The reaction plate is secured in position by members which are attached to the track along either side of the secondary member and which abut the upper surfaces of the downwardlyinclined parts of the reaction plate.
Inventors
- 👤 Richard Humphrey Haynes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:46
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/025
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
141 words
In combination a prepared track and a generally horizontal linear induction motor secondary member extending along the track for co-operation with a single-sided linear induction motor primary member carried above it by a vehicle arranged for operation along the track whereby to propel the vehicle, the linear induction motor secondary member comprising an electrically conductive reaction plate, magnetic material beneath the reaction plate and interposed between the reaction plate and the track, the reaction plate being wider than the magnetic material so as along the sides of the secondary member to extend beyond the magnetic material in side portions for providing longitudinal paths for secondary member current, and clamping means for separate co-operation with the said side portions and attached to the track to secure the reaction plate in position by abutting engagement with the upper surfaces of the side portions.
Claim 2
Dependent Claim
141 words
In combination a prepared track and a generally horizontal linear induction motor secondary member extending along the track for co-operation with a single-sided linear induction motor primary member carried above it by a vehicle arranged for operation along the track whereby to propel the vehicle, the linear induction motor secondary member comprising an electrically conductive reaction plate, magnetic material beneath the reaction plate and interposed between the reaction plate and the track, the reaction plate being wider than the magnetic material so as along the sides of the secondary member to extend beyond the magnetic material in side portions for providing longitudinal paths for secondary member current, and clamping means for separate co-operation with the said side portions and attached to the track to secure the reaction plate in position by abutting engagement with the upper surfaces of the side portions.
Claim 3
Dependent Claim
70 words
A combination according to claim 1, wherein the secondary member is received in a channel formed in the track and the clamping means co-operate with the side portions at recessed parts including the side edges of the reaction plate, the track at either side of the channel, the clamping means, and the reaction plate other than the recessed parts thereof in combination presenting an upwardly facing and generally plane surface.
Claim 4
Dependent Claim
37 words
A combination according to claim 1, wherein the clamping means co-operate with the side portions at parts of the reaction plate which include the reaction plate side edges and which are inclined downwardly towards the side edges.
Claim 5
Dependent Claim
33 words
A combination according to claim 1, which includes supports on either side of the magnetic material for supporting the side portions from the track against downward forces which may be imposed upon them.
Claim 6
Dependent Claim
42 words
A combination according to claim 4, wherein the side portions comprise recessed parts which project laterally beyond the supports to the side edges of the reaction plates, the clamping means engaging the side portions at the upper surfaces of the recessed parts.
Claim 7
Dependent Claim
21 words
A combination according to claim 5, wherein the recessed parts are inclined downwardly towards the side edges of the reaction plates.
Claim 8
Dependent Claim
72 words
A combination according to claim 1, which includes an adhesive layer bonding the undersurface of the magnetic material to the track, the adhesive layer in operation counteracting at least part of any net upward force on the secondary member caused by attraction to the primary member of the magnetic material of the secondary member, and deforming in shear to accommodate differential thermal expansion and contraction between the magnetic material and the track.
Claim 9
Dependent Claim
39 words
A combination according to claim 1, wherein the reaction plate has a projection extending downwardly from each side portion for co-operation with at least one member secured to the track whereby to locate the reaction plate longitudinally in position.
Claim 10
Dependent Claim
27 words
A combination according to claim 8, wherein each said member also provides support for the respective side portion against downward forces which may be imposed upon it.
Claim 11
Dependent Claim
43 words
A combination according to claim 6, wherein the reaction plate has a projection extending outwardly from the upper surface of each recessed part for co-operation with at least one member secured to the track whereby to locate the reaction plate longitudinally in position.
Claim 12
Dependent Claim
16 words
A combination according to claim 10, wherein the said member forms part of the clamping means.
Claim 13
Dependent Claim
25 words
A combination according to claim 4, which includes a sheet of resin impregnated asbestos separating the reaction plate from the magnetic material and the supports.
Claim 14
Dependent Claim
95 words
A combination according to claim 1, wherein the magnetic material is formed of a plurality of blocks of magnetic material extending along the track with gaps between the adjacent ends of successive blocks for accommodating differential thermal expansion and contraction relative to the track, the combination including, for each said gap, a magnetic member disposed in overlapping relationship beneath the magnetic blocks forming the gap so as magnetically to bridge the gap, at least one of the magnetic blocks being arranged for longitudinal movement with respect to the magnetic member where they overlap one another.
Claim 15
Dependent Claim
17 words
A combination as claimed in claim 1, wherein the clamping means are releasably attached to the track.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |