Patent US3855485A successfully refreshed from Google Patents.
US3855485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ground coil assembly of a linear induction motor with d.c. levitating armature for high speed vehicle
Assignee: Hitachi Cable Ltd
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Filing: 1973-06-11
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Granted: 1974-12-17
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Expires: 1993-06-11
Abstract
Abstract A ground coil assembly of a DC linear motor for use in a high speed vehicle, comprises a fixed, levitating and driving armature coil including coil elements of two or more phases which are arranged to have a structural phase shift of 2 pi /n from each other where n is the number of phases of the fixed armature coil. The ground coil assembly may further comprise a fixed induction coil including many coil elements which have the same length as that of the coil elements of the fixed armature coil. The coil elements of the fixed induction coil are respectively arranged to have a structural phase shift of 2 pi /2n with respect to each of the fixed armature coil elements. These coil elements of the fixed armature coil may preferably be arranged in a vertically inverted manner.
Inventors
- 👤 M Toyoshima
- 👤 K Katakami
- 👤 K Matsui
- 👤 T Umemori
- 👤 S Osawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:54
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; B; B60; B60L; B60L13/00; B60L13/03; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
255 words
In a ground coil assembly of a D. C. linear motor for a high speed vehicle, wherein said linear motor is of the type wherein the vehicle has movable magnetic fields disposed such that the magnetic flux generated is perpendicular to the current loop of the fixed armature windings of the ground coil assembly and cuts across vertical and horizontal conductors of the fixed armature windings, and wherein the fixed armature windings consist of rectangular current loops having vertical and horizontal conductors, aligned continuously along the path of travel of the moving vehicle, and a relative lift is developed between the horizontal conductors of the fixed armature windings and the movable magnetic field and at the same time a relative drive is developed between the vertical conductors of the fixed armature windings and the moving magnetic field to thereby cause the vehicle to be suspended and propelled along the path, the improvement wherein: the fixed armature windings of the ground coil assembly comprises a coil which includes a multiplicity of coil elements of at least two electrical phases arranged with a conductor for respective phases of 2 pi /n relative to each other, and said ground coil assembly further comprises a fixed induction coil which includes a multiplicity of coil elements of the same winding pitch as that of the coil elements of the fixed armature coil, with the coil elements of the fixed induction coil having a conductor pitch of 2 pi /2n, wherein n is the number of phases of said armature coil.
Claim 2
Dependent Claim
255 words
In a ground coil assembly of a D. C. linear motor for a high speed vehicle, wherein said linear motor is of the type wherein the vehicle has movable magnetic fields disposed such that the magnetic flux generated is perpendicular to the current loop of the fixed armature windings of the ground coil assembly and cuts across vertical and horizontal conductors of the fixed armature windings, and wherein the fixed armature windings consist of rectangular current loops having vertical and horizontal conductors, aligned continuously along the path of travel of the moving vehicle, and a relative lift is developed between the horizontal conductors of the fixed armature windings and the movable magnetic field and at the same time a relative drive is developed between the vertical conductors of the fixed armature windings and the moving magnetic field to thereby cause the vehicle to be suspended and propelled along the path, the improvement wherein: the fixed armature windings of the ground coil assembly comprises a coil which includes a multiplicity of coil elements of at least two electrical phases arranged with a conductor for respective phases of 2 pi /n relative to each other, and said ground coil assembly further comprises a fixed induction coil which includes a multiplicity of coil elements of the same winding pitch as that of the coil elements of the fixed armature coil, with the coil elements of the fixed induction coil having a conductor pitch of 2 pi /2n, wherein n is the number of phases of said armature coil.
Claim 3
Dependent Claim
39 words
In the ground coil assembly as claimed in claim 1, the further improvement wherein the adjacent coil elements for each phase of said fixed armature windings are wound inversely to each other and are arranged at different vertical heights.
Claim 4
Dependent Claim
219 words
In a ground coil assembly for a D. C. linear motor for a high speed vehicle of the type wherein the vehicle is provided with movable magnetic fields, said ground coil assembly includes fixed armature windings which consist of rectangular current loops having vertical and horizontal conductors, aligned continuously along the path of travel of said vehicle, said movable magnetic fields are disposed such that the magnetic flux generated is perpendicular to the current loops of the fixed armature windings and cuts across the vertical and horizontal conductors of said fixed armature windings, and whereby a relative lift is developed between the horizontal conductors of the fixed armature windings and said movable magnetic fields, and at the same time a relative drive is developed between the vertical conductors of the fixed armature windings and the movable magnetic field, thereby causing the movable vehicle to be suspended and propelled along said path, tHe improvement wherein: said fixed armature coil winding comprises a multiplicity of coil elements of at least two electrical phases, with said coil elements for each phase having a conductor pitch of 2 pi /n relative to each other, wherein n is the number of phases of said armature coil, and wherein adjacent coil elements are inversely wound relative to each other and are of different vertical height.
Claim 5
Dependent Claim
219 words
In a ground coil assembly for a D. C. linear motor for a high speed vehicle of the type wherein the vehicle is provided with movable magnetic fields, said ground coil assembly includes fixed armature windings which consist of rectangular current loops having vertical and horizontal conductors, aligned continuously along the path of travel of said vehicle, said movable magnetic fields are disposed such that the magnetic flux generated is perpendicular to the current loops of the fixed armature windings and cuts across the vertical and horizontal conductors of said fixed armature windings, and whereby a relative lift is developed between the horizontal conductors of the fixed armature windings and said movable magnetic fields, and at the same time a relative drive is developed between the vertical conductors of the fixed armature windings and the movable magnetic field, thereby causing the movable vehicle to be suspended and propelled along said path, tHe improvement wherein: said fixed armature coil winding comprises a multiplicity of coil elements of at least two electrical phases, with said coil elements for each phase having a conductor pitch of 2 pi /n relative to each other, wherein n is the number of phases of said armature coil, and wherein adjacent coil elements are inversely wound relative to each other and are of different vertical height.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |