Velocity-position servo with improved gain control

Details Velocity-position servo with improved gain control Velocity-position servo with improved gain control

1983-09-27

1985-11-05

Dobeck, B.

Electricity: motive power systems

Positional servo systems

Multiple mode systems

318594, 318619, 318561, G05B 1118

Patent

active

045516642

ABSTRACT:
In a rotary printer control system, a dual mode servo for controlling the velocity and position of a rotary print wheel and a print wheel carriage is normally operated at a relatively high gain value. When the servo is switched from the velocity mode to the position mode, the length of time the servo remains in the position mode is monitored and, if this exceeds a predetermined maximum time period, the gain of the servo loop is switched to a relatively low value in order to reduce oscillations of the print wheel or carriage about the HOME position. The gain reduction is accomplished by inserting a supplemental R-C network in parallel with the high gain R-C network, and the range or ratios of the relatively high gain to the relatively low gain values is from about 10 to about 30.

REFERENCES:
patent: 3721882 (1973-03-01), Helms
patent: 4347470 (1982-08-01), Kohzai et al.
patent: 4486693 (1984-12-01), Hamati et al.

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