Patent EP0303474A2 successfully refreshed from Google Patents.
US3679952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two slot linear induction motor
Assignee: Merlin Gerin SA
•
Filing: 1971-01-19
•
Granted: 1972-07-25
•
Expires: 1991-01-19
Abstract
Abstract Linear induction motor comprising a magnetic field structure bearing two spaced coils supplied with currents out of phase by an angle of 2 pi /3 and dividing the air gap face into three equal pole faces to produce a balanced travelling magnetic field.
Inventors
- 👤 Yves Pelenc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:15
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/025
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
A two-phase linear induction motor arrangement comprising a magnetic field structure and an elongated armature adapted for relative movement one with respect to the other in the longitudinal direction of said armature, said magnetic field structure being adapted and positioned relative to said armature to define three adjacent coplanar pole faces spaced apart in said longitudinal direction and separated from said armature by a small gap, and a pair of coils including active conductor means extending on said magnetic field structure transversally of said longitudinal direction along the transition zones between said pole faces, said coils carrying respectively alternating currents substantially 120 electrical degrees out of phase so as to produce in said gap a magnetic field moving in said longitudinal direction to cause said relative movement.
Claim 2
Dependent Claim
127 words
A two-phase linear induction motor arrangement comprising a magnetic field structure and an elongated armature adapted for relative movement one with respect to the other in the longitudinal direction of said armature, said magnetic field structure being adapted and positioned relative to said armature to define three adjacent coplanar pole faces spaced apart in said longitudinal direction and separated from said armature by a small gap, and a pair of coils including active conductor means extending on said magnetic field structure transversally of said longitudinal direction along the transition zones between said pole faces, said coils carrying respectively alternating currents substantially 120 electrical degrees out of phase so as to produce in said gap a magnetic field moving in said longitudinal direction to cause said relative movement.
Claim 3
Dependent Claim
24 words
A linear induction motor arrangement according to claim 1, wherein said pair of coils is supplied by two phase currents of a three-phase system.
Claim 4
Dependent Claim
18 words
A linear induction motor arrangement according to claim 1, wherein said three pole faces have substantially equal dimensions.
Claim 5
Dependent Claim
36 words
A linEar induction motor arrangement according to claim 1, wherein said magnetic field structure comprises a pair of slots extending perpendicularly to said longitudinal direction along said transition zones to accommodate said active conductor means, respectively.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |