US3858522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear motor for high speed railroads
Assignee: Hitachi Ltd
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Filing: 1973-06-11
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Granted: 1975-01-07
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Expires: 1993-06-11
Abstract
Abstract In a linear motor including field coils and armature coils which act for both the levitation and propulsion of the vehicle, an additional coil is provided which cooperates with the armature for increasing the suspending force and the stabilizing force. The width of the additional coils may be less than that of the field coils making the propelling force relatively independent of the levitating force.
Inventors
- 👤 Naoki Maki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:47
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/03; B; B60; B60L; B60L13/00; B60L13/10; B60L2200/00; B60L2200/26; B60L2220/00; B60L2220/10; B60L2220/14; H02K7/00; H02K7/08; H02K7/09; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/902; Y10S505/903; Y10S505/905
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
A linear motor for high speed railroads comprising at least one armature coil of substantially rectangular form which has a first pair of sides parallel to the direction of the movement of the vehicle and a second pair of sides perpendicular to the direction of the movement of the vehicle and at least one field coil disposed opposite to said second pair of sides of said armature coil so that a propelling force is generated by the reaction between the current flowing through said second pair of sides of the armature coil and the magnetic field produced by said field coil, characterized in that means are provided for producing a second magnetic field across at least one of said first pair of sides of said armature coil so that a levitating or stabilizing force is generated by the reaction between the current flowing through said first pair of sides of said armature coil and said second magnetic field.
Claim 2
Dependent Claim
158 words
A linear motor for high speed railroads comprising at least one armature coil of substantially rectangular form which has a first pair of sides parallel to the direction of the movement of the vehicle and a second pair of sides perpendicular to the direction of the movement of the vehicle and at least one field coil disposed opposite to said second pair of sides of said armature coil so that a propelling force is generated by the reaction between the current flowing through said second pair of sides of the armature coil and the magnetic field produced by said field coil, characterized in that means are provided for producing a second magnetic field across at least one of said first pair of sides of said armature coil so that a levitating or stabilizing force is generated by the reaction between the current flowing through said first pair of sides of said armature coil and said second magnetic field.
Claim 3
Dependent Claim
37 words
A linear motor as defined in claim 1, characterized in that said means for producing said second magnetic field comprises at least one coil disposed substantially opposite to said first pair of sides of said armature coil.
Claim 4
Dependent Claim
51 words
A linear motor as defined in claim 1, characterized in that said means for producing said second magnetic field comprises at least one magnetic core which has a magnetic pole disposed substantially opposite to said first pair of sides of said armature coil and which is magnetized by said field coil.
References Cited (Backward Citations)
GB1036401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |