Dynamic braking of direct current motors

Details Dynamic braking of direct current motors Dynamic braking of direct current motors

1982-10-22

1984-05-22

Rubinson, G. Z.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Braking

318 56, 318 60, 318 63, 318 86, 318376, H02P 312

Patent

active

044503881

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.

REFERENCES:
patent: 2248577 (1941-07-01), McNairy
patent: 4092577 (1978-05-01), Markham

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