D.C. motor control

Details D.C. motor control D.C. motor control

1976-12-17

1978-03-14

Schaefer, Robert K.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318331, 318345AB, 318326, H02P 506

Patent

active

040793010

ABSTRACT:
A control circuit for a direct current motor having separately excited armature and field windings and operable in both the constant torque and constant horsepower modes includes a speed control circuit having a transfer characteristic providing an extremely high gain at lower frequencies and a low gain, for example unity, at higher frequencies and further includes means to reduce the low frequency gain when motor operation is switched from the constant torque to the constant horsepower mode.

REFERENCES:
patent: 3599064 (1971-08-01), Friedman
patent: 3935520 (1976-01-01), Johnson

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