Device for an accurate control of final positioning and follow-u

Details Device for an accurate control of final positioning and follow-u Device for an accurate control of final positioning and follow-u

1975-04-29

1977-05-24

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With compensating features

318561, 318592, G05D 23275

Patent

active

040258394

ABSTRACT:
A system for positioning a displaceable member with respect to a reference conventionally uses a servo-mechanism having feedback position sensing and speed sensing loops connected to an input of the control path of the servo. Usually, the system operates in two successive phases:- a coarse positioning phase and a fine positioning phase. In the fine positioning phase, both loops are active. Nevertheless, if the reference tends to fluctuate, the accuracy of the final positioning may be less than acceptable. In a system according to this invention, an additional device is provided which, under a threshold value of the output of the position difference sensor, disconnects the speed difference sensor and inserts in the single remaining loop series correcting networks which, in addition to ensuring improved accuracy of the final positioning, also ensures an accurate follow-up of the fluctuations of the reference.

REFERENCES:
patent: 3917930 (1975-11-01), Davey et al.

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