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US 4,232,259 AGranted
Servo-system
AssigneeYokogawa Electric Works, Ltd.
InventorsNobuo Kaieda, Yoshihiro Okano
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Abstract
A servo-system includes a high-gain direct-coupled direct current (dc) differential amplifier to which a dc input signal is fed. An adder adds the dc amplifier output to a comparison voltage, and the adder output is applied through a filter circuit to a second input of the differential dc amplifier. A servo-amplifier drives a servo-motor in accordance with the dc amplifier output. Means are provided for zero-balancing the dc amplifier output while varying the comparison voltage by the servo-motor.
Claims15
A servo-system responsive to a dc input signal comprising:
- a high-gain direct-coupled differential dc amplifier having said dc input signal as one input thereto,
- comparison signal generating means for generating a comparison signal,
- an adder for adding the output of said dc amplifier to said comparison signal,
- a filter circuit for filtering the output of said adder and for applying the filtered output as a second input to said dc amplifier,
- a servo-motor,
- a servo-amplifier connected between said dc amplifier and said servo-motor for driving said servo-motor in accordance with the differential output of said dc amplifier, and
- coupling means for coupling said comparison signal generating means to said servo-motor to vary said comparison signal in accordance with displacement of said servo-motor to zero-balance the output of said direct-coupled dc amplifier.
4 more elements
Dependencies are inferred from the claim text.