Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1977-08-17
1979-03-20
Smith, Jr., David
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318318, 318314, H02P 516
Patent
active
041456424
ABSTRACT:
A system for controlling the rotation of a direct current motor has an armature resistance control circuit. An operational amplifier has one input terminal connected to the direct current motor and another input terminal connected to form a differential amplifier. A first resistor is connected between an output terminal of the operational amplifier and one of the input terminals. A second resistor is connected between the other input terminal of the operational amplifier and a terminal for applying a control signal voltage thereto. A third resistor is connected between the output terminal of the operational amplifier and the other input terminal. The rotational phase of a structure rotated by the direct current motor produces a phase detection signal. A phase comparing means compares the phase detection signal with a reference signal and applies the resulting output, phase comparison error signal as a control signal voltage. The armature resistance and the first, second, and third resistors are connected as a bridge circuit.
REFERENCES:
patent: 3458155 (1969-07-01), Planteijot
patent: 3781620 (1973-12-01), Toth
patent: 3885206 (1975-05-01), Hort
patent: 3965405 (1976-06-01), Romano
Hiraguri Seisuke
Kosaka Yoshiteru
Smith Jr. David
Victor Company of Japan Ltd.
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