Electricity: motive power systems – Positional servo systems – Multiple mode systems
Patent
1989-01-23
1990-05-08
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
Multiple mode systems
318590, G05B 1118, G05B 501
Patent
active
049241656
ABSTRACT:
In a servo control system having a coarse control unit and a fine control unit, a differential gain is changed temporarily during a short period at an initial state of fine control to shorten a settling time and to reduce overshoot. The servo control system includes a controlled system including a controlled object and a drive unit, a unit for controlling a speed of the controlled object to move and position the same to or adjacent a reference position, and a unit having a differential control circuit and for controlling a position of the controlled object to position the controlled object to the reference position, after the speed control unit moves the controlled object to or adjacent to the reference position. A differential gain of the differential control circuit is selected from at least two values, a first of which is used at an initial state and a second of which is used after the initial state. The servo control system is applicable to a disc system, a printer, etc.
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Fujitsu Limited
Ro Bentsu
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