US3820472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two sided linear induction motor especially for suspended vehicles
Assignee: Mannesmann Demag Krauss Maffei GmbH
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Filing: 1973-01-16
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Granted: 1974-06-28
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Expires: 1993-01-16
Abstract
Abstract A magnetically suspended vehicle is provided with a two-sided linear induction motor having a central winding structure or assembly flanked by a pair of rails magnetically cooperating with the winding structure for propelling the vehicle. The rails of ferromagnetic material are coated with a layer of high electrical conductivity along their faces turned toward the winding structure.
Inventors
- 👤 P Schwarzler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:29
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: 10
Claim 1
Independent Claim
150 words
A double-sided linear induction motor comprising a central coil assembly, and a pair of reaction rails flanking said assembly and extending longitudinally in parallel relationship on opposite sides thereof, each of said reaction rails comprising a member of ferromagnetic material, and a respective layer of high electrical conductivity disposed on each of said members and confronting said coil assembly, said coil assembly extending longitudinally between said reaction rails and being longitudinally subdivided into a plurality of unitary magnetic core segments of block shape generally perpendicular to the longitudinal direction by nonmagnetic spacers defining longitudinally spaced grooves opening in opposite directions toward said reaction rails, each of said segments having opposite faces respectively juxtaposed with said layers, said coil assembly being provided with coils received in said grooves and generating a traveling magnetic field extending longitudinally through said members and transversely through pairs of said segments while closing through said members.
Claim 2
Dependent Claim
150 words
A double-sided linear induction motor comprising a central coil assembly, and a pair of reaction rails flanking said assembly and extending longitudinally in parallel relationship on opposite sides thereof, each of said reaction rails comprising a member of ferromagnetic material, and a respective layer of high electrical conductivity disposed on each of said members and confronting said coil assembly, said coil assembly extending longitudinally between said reaction rails and being longitudinally subdivided into a plurality of unitary magnetic core segments of block shape generally perpendicular to the longitudinal direction by nonmagnetic spacers defining longitudinally spaced grooves opening in opposite directions toward said reaction rails, each of said segments having opposite faces respectively juxtaposed with said layers, said coil assembly being provided with coils received in said grooves and generating a traveling magnetic field extending longitudinally through said members and transversely through pairs of said segments while closing through said members.
Claim 3
Dependent Claim
27 words
A linear induction motor defined in claim 1 wherein said coils include two coils received in corresponding longitudinally spaced coils grooves on opposite sides of said assembly.
Claim 4
Dependent Claim
37 words
The linear induction motor defined in claim 3 wherein said segments are each rectangular stacks laminated from sheet-iron lamella projecting laterally beyond said spacers in the direction of said reaction rails and defining said grooves between them.
Claim 5
Dependent Claim
44 words
A vehicle system provided with the motor defined in claim 4 and comprising a track formed with said reaction rails, at least one vehicle movable along said track in the direction in which said rail extends, and means mounting said assembly upon said vehicle.
Claim 6
Dependent Claim
35 words
The system defined in claim 5, further comprising means on said track and on said vehicle for magnetically supporting said vehicle on said track across at least one air gap spanned by a magnetic field.
Claim 7
Dependent Claim
75 words
The system defined in claim 6 wherein the lastmentioned means includes a pair of armature rails extending in said direction and spaced apart transversely thereto, respective rows of electromagnets extending in said direction and fixed to said vehicle, said electromagnets having cores spacedly juxtaposed with said armature rails, and means including said electromagnet for laterally positioning said vehicle relative to said reaction rails to maintain substantially constant-width air gaps between said assembly and said layer.
Claim 8
Dependent Claim
24 words
The system defined in claim 7 wherein said members are composed of soft magnetic iron and said layers are composed of aluminum or copper.
Claim 9
Dependent Claim
33 words
The system defined in claim 8 wherein said reaction rails are disposed centrally of said track between said armature rails and said assembly is mounted along a vertical median plane of said vehicle.
Claim 10
Dependent Claim
35 words
The system defined in claim 9 wherein each of said reaction rails comprises a flat bar of said soft magnetic iron and lies in a respective vertical plane parallel to the direction of vehicle travel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |