Braking mode control for a chopper controlled d-c electric motor

Details Braking mode control for a chopper controlled d-c electric motor Braking mode control for a chopper controlled d-c electric motor

1975-12-16

1977-09-27

Schaffer, Robert K.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318376, 318380, H02P 314

Patent

active

040514218

ABSTRACT:
A control system for effecting smooth braking resistor staging of a chopper controlled direct current electric motor. The control system utilizes auxiliary switches mechanically coupled to resistor by-pass contacts to sense actual motion of the by-pass contacts and to provide signals for reducing the chopper duty factor. In a preferred embodiment the chopper duty factor is reduced to an intermediate level between maximum and minimum duty factor by modification of an error signal representing the difference between actual motor current and commanded motor current so as to maintain the control system in a closed loop condition. In a further embodiment during dynamic braking the chopper duty factor is limited to a level sufficient to assure adequate operating voltage by checking for a minimum voltage level on a line filter capacitor, which capacitor supplies power for separate field excitation, whenever the chopper is at maximum duty factor and immediately reducing the duty factor if the capacitor voltage is less than the minimum voltage.

REFERENCES:
patent: 3769565 (1973-10-01), Littwin
patent: 3883786 (1975-05-01), McNaughton et al.
patent: 3947740 (1976-03-01), Tsuboi
patent: 3983465 (1976-09-01), Tsuboi et al.
patent: 3995204 (1976-11-01), Konrad et al.

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