Patent US3890906A successfully refreshed from Google Patents.
US3890906A
Expired / Lapsed
US
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Linear synchronous motor for magnetically levitated vehicle
Assignee: Hitachi Ltd
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Filing: 1973-03-27
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Granted: 1975-06-24
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Expires: 1993-03-27
Abstract
Abstract The linear synchronous motor under consideration is used for propelling a magnetically levitated vehicle along a track, the field coils of the motor being carried on the vehicle while the driving coils are disposed along the track. During running of the vehicle, it is possible that a vibration may occur due to attraction and repulsion between the driving and field coils, thereby impairing smooth and stable running of the vehicle. In order to reduce the abovementioned vibration, the dimensions of the driving and field coils and the average distance between the driving and field coils are chosen so that a specific correlation is maintained between them.
Inventors
- 👤 Naoki Maki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:03
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/03; B; B60; B60L; B60L13/00; B60L13/10; B60L2220/00; B60L2220/10; B60L2220/14; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/902; Y10S505/903; Y10S505/905
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
113 words
In a magnetically levitated vehicle which includes a linear synchronous motor having field coils on the vehicle for generating a constant magnetic field and driving coils disposed on the ground and opposite to the path of said field coils, the improvement wherein the ratio of the width of said driving coils to the width of said field coils is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said field coils, 2b is the width of said driving coils, and g is the average distance between the paths of said field coils and said driving coils in the normal running of the vehicle:
Claim 2
Dependent Claim
113 words
In a magnetically levitated vehicle which includes a linear synchronous motor having field coils on the vehicle for generating a constant magnetic field and driving coils disposed on the ground and opposite to the path of said field coils, the improvement wherein the ratio of the width of said driving coils to the width of said field coils is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said field coils, 2b is the width of said driving coils, and g is the average distance between the paths of said field coils and said driving coils in the normal running of the vehicle:
Claim 3
Dependent Claim
89 words
The improvement as defined in claim 1, wherein said field coils are horizontally disposed in the lower center portion of the vehicle and wherein at least a pair of field coils are vertically disposed in both the lower side portions of the vehicle and in parallel to the longitudinal vertical center plane of the vehicle and a pair of guiding and suspending coils are vertically disposed on the ground side approximately opposite to the paths of said pair of field coils but being displaced to a slightly lower position.
Claim 4
Dependent Claim
114 words
In a magnetically levitated vehicle which includes a linear synchronous motor having field coils on the vehicle for generating a constant magnetic field and driving coils on the ground and opposite to the path of said field coils, the improvement wherein the ratio of the width of said driving coils to the width of said field coils is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said field coils, 2b is the width of said driving coils, and g is the average distance between the paths of said field coils and that of said driving coils in the normal running of the vehicle:
Claim 5
Dependent Claim
114 words
In a magnetically levitated vehicle which includes a linear synchronous motor having field coils on the vehicle for generating a constant magnetic field and driving coils on the ground and opposite to the path of said field coils, the improvement wherein the ratio of the width of said driving coils to the width of said field coils is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said field coils, 2b is the width of said driving coils, and g is the average distance between the paths of said field coils and that of said driving coils in the normal running of the vehicle:
Claim 6
Dependent Claim
130 words
In a magnetically levitated vehicle which includes a linear synchronous motor having at least one pair of field coils on the vehicle for generating a constant magnetic field and driving coils disposed on the ground and opposite to the path of an imaginary field coil constituted by portions of said pair of field coils, the improvement wherein the ratio of the width of said driving coils to the width of said imaginary field coil is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said imaginary field coil, 2b is the width of said driving coils, and g is the average distance between the paths of said field coils and said driving coils in the normal running of the vehicle:
Claim 7
Dependent Claim
130 words
In a magnetically levitated vehicle which includes a linear synchronous motor having at least one pair of field coils on the vehicle for generating a constant magnetic field and driving coils disposed on the ground and opposite to the path of an imaginary field coil constituted by portions of said pair of field coils, the improvement wherein the ratio of the width of said driving coils to the width of said imaginary field coil is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said imaginary field coil, 2b is the width of said driving coils, and g is the average distance between the paths of said field coils and said driving coils in the normal running of the vehicle:
Claim 8
Dependent Claim
119 words
The improvement as defined in claim 4, wherein said field coils are disposed near the lower center portion of the vehicle and positioned vertically and opposite to each other in relation to the longitudinal vertical center plane of the vehicle, guiding coils being vertically disposed on the ground side so as to be positioned between the paths of said pair of field coils, and at least another pair of field coils are horizontally disposed in the lower side portions of the vehicle and opposite in relation to the longitudinal center line of the vehicle, a corresponding pair of suspending coils being disposed on the ground horizontally and respectively opposite to the paths of said another pair of field coils.
Claim 9
Dependent Claim
130 words
In a magnetically levitated vehicle which includes a linear synchronous motor having at least one pair of field coils on the vehicle for generating a constant magnetic field and driving coils disposed on the ground and opposite to the path of an imaginary field coil constituted by portions of said pair of field coils, the improvement wherein the ratio of the width of said driving coils to the width of said imaginary field coil is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said imaginary field coil, 2b is the width of said driving coils, and g is the average distance between the paths of said field coils and said driving coils in the normal running of the vehicle:
Claim 10
Dependent Claim
130 words
In a magnetically levitated vehicle which includes a linear synchronous motor having at least one pair of field coils on the vehicle for generating a constant magnetic field and driving coils disposed on the ground and opposite to the path of an imaginary field coil constituted by portions of said pair of field coils, the improvement wherein the ratio of the width of said driving coils to the width of said imaginary field coil is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said imaginary field coil, 2b is the width of said driving coils, and g is the average distance between the paths of said field coils and said driving coils in the normal running of the vehicle:
Claim 11
Dependent Claim
130 words
In a magnetically levitated vehicle which includes a linear synchronous motor having at least one pair of field coils on the vehicle for generating a constant magnetic field and driving coils disposed on the ground and opposite to the path of an imaginary field coil constituted by portions of said pair of field coils, the improvement wherein the ratio of the width of said driving coils to the width of said imaginary field coil is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said imaginary field coil, 2b is the width of said driving coils, and g is the average distance between the paths of said field coils and said driving coils in the normal running of the vehicle:
Claim 12
Dependent Claim
130 words
In a magnetically levitated vehicle which includes a linear synchronous motor having at least one pair of field coils on the vehicle for generating a constant magnetic field and driving coils disposed on the ground and opposite to the path of an imaginary field coil constituted by portions of said pair of field coils, the improvement wherein the ratio of the width of said driving coils to the width of said imaginary field coil is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said imaginary field coil, 2b is the width of said driving coils, and g is the average distance between the paths of said field coils and said driving coils in the normal running of the vehicle:
Claim 13
Dependent Claim
118 words
The improvement as defined in claim 7, wherein said field coils are disposed near the lower center portion of the vehicle and positioned verticaLly and opposite to each other in relation to the longitudinal vertical center plane of the vehicle, guiding coils being vertically disposed on the ground side so as to be positioned between the paths of said pair of field coils, and at least another pair of field coils are horizontally disposed in the lower side portions of the vehicle and opposite in relation to the longitudinal center line of the vehicle, a corresponding pair of suspending coils being disposed on the ground horizontally and respectively opposite to the paths of said pair of field coils.
Claim 14
Dependent Claim
259 words
In a magnetically levitated vehicle which includes a linear synchronous motor having at least one first pair of field coils disposed near the lower center portion of the vehicle and positioned vertically and opposite to each other in relation to the longitudinal vertical center plane of the vehicle, at least one second pair of field coils horizontally disposed in the lower side portions of the vehicle and opposite in relation to the longitudinal center line of the vehicle and at least one third pair of field coils vertically disposed in both the lower side portions of the vehicle in parallel to the longitudinal vertical center plane of the vehicle, guiding coils being vertically disposed on the ground side so as to be positioned between the paths of said first pair of field coils, a pair of suspending coils being disposed on the ground horizontally and respectively opposite to the paths of said second pair of field coils, and a pair of driving coils being disposed on the ground vertically and respectively opposite to the paths of said third pair of field coils, the improvement wherein the ratio of the width of said driving coils to the width of said third field coils is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said third field coils, 2b is the width of said driving coils, and g is the average distance between the paths of said third field coils and said driving coil in the normal running of the vehicle:
Claim 15
Dependent Claim
259 words
In a magnetically levitated vehicle which includes a linear synchronous motor having at least one first pair of field coils disposed near the lower center portion of the vehicle and positioned vertically and opposite to each other in relation to the longitudinal vertical center plane of the vehicle, at least one second pair of field coils horizontally disposed in the lower side portions of the vehicle and opposite in relation to the longitudinal center line of the vehicle and at least one third pair of field coils vertically disposed in both the lower side portions of the vehicle in parallel to the longitudinal vertical center plane of the vehicle, guiding coils being vertically disposed on the ground side so as to be positioned between the paths of said first pair of field coils, a pair of suspending coils being disposed on the ground horizontally and respectively opposite to the paths of said second pair of field coils, and a pair of driving coils being disposed on the ground vertically and respectively opposite to the paths of said third pair of field coils, the improvement wherein the ratio of the width of said driving coils to the width of said third field coils is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said third field coils, 2b is the width of said driving coils, and g is the average distance between the paths of said third field coils and said driving coil in the normal running of the vehicle:
Claim 16
Dependent Claim
259 words
In a magnetically levitated vehicle which includes a linear synchronous motor having at least one first pair of field coils disposed near the lower center portion of the vehicle and positioned vertically and opposite to each other in relation to the longitudinal vertical center plane of the vehicle, at least one second pair of field coils horizontally disposed in the lower side portions of the vehicle and opposite in relation to the longitudinal center line of the vehicle and at least one third pair of field coils vertically disposed in both the lower side portions of the vehicle in parallel to the longitudinal vertical center plane of the vehicle, guiding coils being vertically disposed on the ground side so as to be positioned between the paths of said first pair of field coils, a pair of suspending coils being disposed on the ground horizontally and respectively opposite to the paths of said second pair of field coils, and a pair of driving coils being disposed on the ground vertically and respectively opposite to the paths of said third pair of field coils, the improvement wherein the ratio of the width of said driving coils to the width of said third field coils is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said third field coils, 2b is the width of said driving coils, and g is the average distance between the paths of said third field coils and said driving coils in the normal running of the vehicle:
Claim 17
Dependent Claim
259 words
In a magnetically levitated vehicle which includes a linear synchronous motor having at least one first pair of field coils disposed near the lower center portion of the vehicle and positioned vertically and opposite to each other in relation to the longitudinal vertical center plane of the vehicle, at least one second pair of field coils horizontally disposed in the lower side portions of the vehicle and opposite in relation to the longitudinal center line of the vehicle and at least one third pair of field coils vertically disposed in both the lower side portions of the vehicle in parallel to the longitudinal vertical center plane of the vehicle, guiding coils being vertically disposed on the ground side so as to be positioned between the paths of said first pair of field coils, a pair of suspending coils being disposed on the ground horizontally and respectively opposite to the paths of said second pair of field coils, and a pair of driving coils being disposed on the ground vertically and respectively opposite to the paths of said third pair of field coils, the improvement wherein the ratio of the width of said driving coils to the width of said third field coils is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said third field coils, 2b is the width of said driving coils, and g is the average distance between the paths of said third field coils and said driving coils in the normal running of the vehicle:
Claim 18
Dependent Claim
113 words
In a magnetically levitated vehicle which includes a linear synchronous motor having field coils on the vehicle for generating a constant magnetic field and driving coils disposed on the ground and opposite to the path of said field coils, the improvement wherein the ratio of the width of said driving coils to the width of said field coils is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said field coils, 2b is the width of said driving coils, and g is the average distance between the paths of said field coils and said driving coils in the normal running of the vehicle:
Claim 19
Dependent Claim
113 words
In a magnetically levitated vehicle which includes a linear synchronous motor having field coils on the vehicle for generating a constant magnetic field and driving coils disposed on the ground and opposite to the path of said field coils, the improvement wherein the ratio of the width of said driving coils to the width of said field coils is chosen so as to fall in the range expressed by the following formula, where 2a is the width of said field coils, 2b is the width of said driving coils, and g is the average distance between the paths of said field coils and said driving coils in the normal running of the vehicle:
References Cited (Backward Citations)
US3158765A
Cited
US3768417A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |