Railway switches and signals – Cab signal or train control – Speed-control systems
Patent
1975-02-03
1976-09-14
Blix, Trygve M.
Railway switches and signals
Cab signal or train control
Speed-control systems
104152, 317 5, B61L 316
Patent
active
039802612
ABSTRACT:
Speed governor for automatic trains comprising a dynamo electric device having a plurality of stators, one for each of a plurality of different predetermined speeds, and a common rotor mounted on a shaft connected to an axle of the train and each stator having a primary winding connected across an a.c. supply and a secondary winding connected via a saturable transformer to the d.c. control winding of a transductor whose a.c. winding is connected in the a.c. supply circuit to the stator, a winding of the transformer being connected to train speed control means such that saturation of the transformer occurs at a predetermined rotor speed to increase the impedance of the transductor and reduce the current through the windings of the transformer correspondingly.
REFERENCES:
patent: 2222801 (1940-11-01), Logan
patent: 2841745 (1958-07-01), Shields
Blix Trygve M.
Eisenzopf Reinhard J.
London Transport Executive
Massung Howard G.
Yeager Robert D.
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