Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
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
General Electric Company
Mutter Michael K.
Renner Arnold E.
Schaefer Robert K.
Schlamp Philip L.
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