US3659187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for supplying electric energy to an electric traction railway vehicle
Assignee: Eclairage des Vehicules Sur Rail EVR SA
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Filing: 1970-03-25
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Granted: 1972-04-25
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Expires: 1990-03-25
Abstract
Abstract In an electric energy supply system for an electrically drawn railway carriage and fed from the medium-voltage supply of the drive locomotive, a current smoothing choke is coupled to a thyristor type inverter supplying a synchronous motor. A lowvoltage alternator is driven by the motor and elements sensitive to the angular position of the rotor of the alternator control the priming of the thyristors of the inverter.
Inventors
- 👤 Paul Lamorlette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:37
CPC Classifications
B; B60; B60L; B60L1/00; H; H02; H02J; H02J3/00; H02J3/36; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/024; B60L2200/00; B60L2200/26; B60L2220/00; B60L2220/10; B60L2220/14; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
In a system for supplying electrical energy to an electric traction railway vehicle from the medium-voltage supply system of a traction locomotive, the improvement comprising a synchronous motor having at least two windings, a current-smoothing inductance connected to said medium-voltage supply system, an inverter comprising thyristors connected to said inductance and feeding said synchronous motor, a low-voltage alternator driven by the motor, means sensitive to the angular position of the rotor of the alternator for controlling the firing of the thyristors of the inverter, and means for insuring that when the mean voltage of the rectified supply current is relatively high, the supply is connected in series with at least two windings of the synchronous motor.
Claim 2
Dependent Claim
116 words
In a system for supplying electrical energy to an electric traction railway vehicle from the medium-voltage supply system of a traction locomotive, the improvement comprising a synchronous motor having at least two windings, a current-smoothing inductance connected to said medium-voltage supply system, an inverter comprising thyristors connected to said inductance and feeding said synchronous motor, a low-voltage alternator driven by the motor, means sensitive to the angular position of the rotor of the alternator for controlling the firing of the thyristors of the inverter, and means for insuring that when the mean voltage of the rectified supply current is relatively high, the supply is connected in series with at least two windings of the synchronous motor.
Claim 3
Dependent Claim
59 words
The system according to claim 1, wherein the means sensitive to the angular position of the rotor of the alternator comprises light sources disposed on one side of a slotted wheel driven by the shaft common to the synchronous motor and to the alternator, and photo-conductors disposed on the other side of the slotted wheel, opposite the light sources.
Claim 4
Dependent Claim
16 words
The system according to claim 1, wherein the synchronous motor has fixed field and armature windings.
Claim 5
Dependent Claim
14 words
The system according to claim 1, wherein the low-voltage alternator is a three-phase alternator.
Claim 6
Dependent Claim
14 words
The system according to claim 1, wherein the current-smoothing inductanCe is a screened inductance.
Claim 7
Dependent Claim
110 words
In a system for supplying electrical energy to an electric traction railway vehicle from the medium voltage supply system of a traction locomotive, the improvement comprising a synchronous motor including series excitation means and separate excitation means and means for reading the frequency of the current produced by the alternator for controlling said separate excitation means; a current smoothing inductance connected to said medium voltage supply system; an inverter comprising thyristors connected to said inductance and feeding said synchronous motor; a low-voltage alternator driven by the motor; and means sensitive to the angular position of the rotor of the alternator for controlling the firing of the thyristors of the inverter.
Claim 8
Dependent Claim
110 words
In a system for supplying electrical energy to an electric traction railway vehicle from the medium voltage supply system of a traction locomotive, the improvement comprising a synchronous motor including series excitation means and separate excitation means and means for reading the frequency of the current produced by the alternator for controlling said separate excitation means; a current smoothing inductance connected to said medium voltage supply system; an inverter comprising thyristors connected to said inductance and feeding said synchronous motor; a low-voltage alternator driven by the motor; and means sensitive to the angular position of the rotor of the alternator for controlling the firing of the thyristors of the inverter.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |