B - Operations – Transporting – 60 – L
Patent
B - Operations, Transporting
60
L
342/34.31
B60L 7/22 (2006.01) H02P 3/08 (2006.01)
Patent
CA 1096477
ABSTRACT OF THE DISCLOSURE A chopper and a series circuit of a dynamic braking resistor and a thyristor are connected in parallel with a d.c. motor which is operated as a generator during braking operation. A series circuit of a diode and an inductance element is connected in series with the d.c. motor. A condenser connected between the ground and the junction of the inductance element and the diode forms a filter circuit together with the inductance element. Current generated by the d.c. motor flows into a d.c. source through the diode and the inductance element during regenerative braking operation. An over-voltage detector fires the braking thyristor when the voltage across the condenser becomes greater than a predetermined limit value, as a result the dynamic braking operation is performed. A chopper controller varies the interval between an ON pulse to turn the chopper into ON state and an OFF pulse to turn the chopper into OFF state for adjust- ing ON time and OFF time of the chopper in response to the current through the d.c. motor. An operation changer provides a signal to an automatic phase shifter to extend the interval between the ON and OFF pulses to a predeter- mined period of time enough to quench the braking thyristor when the braking operation of said d.c. motor is changed from the dynamic braking operation to the regenerative braking operation.
308695
Jinbo Yoshiji
Kozu Eiji
Narita Hiroshi
Hitachi Ltd.
Kirby Eades Gale Baker
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