US3824414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary member for single-sided linear induction motor
Assignee: Tracked Hovercraft Ltd
•
Filing: 1973-03-13
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Granted: 1974-07-16
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Expires: 1993-03-13
Abstract
Abstract The secondary of a single-sided, short-stator linear induction motor is formed in sections, for example, with expansion joints between sections. At the discontinuities, the ends of the reaction plate are turned down to provide return paths for circulating induced currents in the vicinity of the discontinuities.
Inventors
- 👤 E Laithwaite
- 👤 T Fellows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:24
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/025
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
109 words
In a single-sided, short stator linear induction motor having a primary member and a secondary member, the secondary member comprising a plurality of generally planar members of electrically conductive material aRranged end-to-end and having discontinuities therebetween, the said members terminating, at at least one of the discontinuities, in end portions which lie to one side of the planes of said members and serve in operation to provide paths for induced current flow in the neighbourhood of the discontinuities in response to the working magnetic flux created by movement of the primary member along the secondary member in generally spaced relation to the side thereof remote from the end portions.
Claim 2
Dependent Claim
109 words
In a single-sided, short stator linear induction motor having a primary member and a secondary member, the secondary member comprising a plurality of generally planar members of electrically conductive material aRranged end-to-end and having discontinuities therebetween, the said members terminating, at at least one of the discontinuities, in end portions which lie to one side of the planes of said members and serve in operation to provide paths for induced current flow in the neighbourhood of the discontinuities in response to the working magnetic flux created by movement of the primary member along the secondary member in generally spaced relation to the side thereof remote from the end portions.
Claim 3
Dependent Claim
31 words
A secondary member as claimed in claim 1, in which the end portions lie in generally transverse planes so as to confront one another in generally parallel relation across the discontinuities.
Claim 4
Dependent Claim
24 words
A secondary member as claimed in claim 2, in which each of the end portions is integral with the remainder of its respective member.
Claim 5
Dependent Claim
26 words
A secondary member as claimed in claim 2, in which each of the end portions is welded into position on the remainder of its respective member.
Claim 6
Dependent Claim
19 words
A secondary member as claimed in claim 1, in which said electrically conductive material is also a magnetic material.
Claim 7
Dependent Claim
43 words
A secondary member as claimed in claim 1, in which said electrically conductive material is a non-magnetic material and a respective member of magnetic material is disposed abutting each of said generally planar members on the same side thereof as said end portions.
Claim 8
Dependent Claim
53 words
A secondary member for a single-sided, short-stator linear induction motor comprising a plurality of generally planar members of electrically conductive material arranged end-to-end and having a discontinuities therebetween, the said members terminating, at at least one of the discontinuities, in end portions which lie to one side of the planes of said members.
Claim 9
Dependent Claim
53 words
A secondary member for a single-sided, short-stator linear induction motor comprising a plurality of generally planar members of electrically conductive material arranged end-to-end and having a discontinuities therebetween, the said members terminating, at at least one of the discontinuities, in end portions which lie to one side of the planes of said members.
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |