Error signal detection circuit in a servo control device

Details Error signal detection circuit in a servo control device Error signal detection circuit in a servo control device

1988-09-01

1991-09-03

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388901, 388910, 388912, 388915, 388811, H62P 516

Patent

active

050461230

ABSTRACT:
An error signal detection circuit in a servo control device comprises a reference signal generation circuit for selectively generating reference signals of different periods, each having a slope which changes from a reference value at a substantially constant gradient, an error detection timing generation circuit for generating timing of detection of an error signal of an object of control, an error signal detection circuit for generating an error signal by detecting the value of a reference signal generated by the reference signal generation circuit at a timing provided by the error detection timing generation circuit, and a slope varying circuit for varying the slope of the reference signal in accordance with the period of the reference signal. By changing the gradient of the slope of the reference signal in accordance with the reference period, the ratio of change of the error signal output to the error can be maintained substantially constant so that the gain of the servo loop can be maintained substantially constant and optimalization of the servo system can thereby be realized.

REFERENCES:
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patent: 4283671 (1981-08-01), Nakano et al.
patent: 4511830 (1985-04-01), Yamada et al.
patent: 4668900 (1987-05-01), Tabuchi
patent: 4672396 (1987-06-01), Pappas et al.
patent: 4734630 (1988-03-01), Okano
patent: 4963801 (1990-10-01), Yamazaki

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