Dynamic braking of direct current motors
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United States of America Patent
Stats
-
May 22, 1984
Grant Date -
N/A
app pub date -
Oct 22, 1982
filing date -
Oct 26, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dynamic braking system for a D.C. traction motor which is driven from an asymmetric bridge rectifier having freewheel diodes to permit circulation of motor generated current. The system employs field reversal to ensure a generated (braking) current direction the same as for motoring and this facility permits injection current braking by phasing up the supply bridges when the motor is braking with full excitation. The brake resistance is in two parts one of which forms an uncontrolled arm of the bridge, this part of the resistance being shunted by a thyristor. Part way through an injection braking process the supply bridge is phased down, the resistance bridge arm shorted out and the supply bridge phased up again. Lower losses and greater braking efficiency result.
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