Browse Prior Art Database

Servo System for Position Control

IP.com Disclosure Number: IPCOM000096283D
Original Publication Date: 1963-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Westenskow, CE: AUTHOR

Abstract

The arrangement is for producing a signal for a closed loop servo system controlling the position of a movable body, e. g., a transducer. Normally, movement of the body operates two signal generators. A position generator 1 produces an output proportional to the position of the body with respect to a datum point. A tachogenerator 2 produces an output proportional to the speed of movement of the body.

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Servo System for Position Control

The arrangement is for producing a signal for a closed loop servo system controlling the position of a movable body, e. g., a transducer. Normally, movement of the body operates two signal generators. A position generator 1 produces an output proportional to the position of the body with respect to a datum point. A tachogenerator 2 produces an output proportional to the speed of movement of the body.

The polarity of both outputs depends on the direction of the movement. The position generator 1 is a potential divider including a resistor 3 along which an arm 4 is movable concomitantly with movement of the body. The tachogenerator output is controllable by means of a manually adjustable potential divider 5. The outputs of the two generators are connected in series, the reference point of the tachogenerator output being the actual output of the position generator.

The combined outputs are fed to amplifier 7, which controls a motor, e. g., for moving the body. The circuit includes a non-linear resistance element 8 for controlling the operating characteristic of the system. The solid headed arrows show the direction of current from the position generator. The other arrows show the direction of current from the tachogenerator.

The circuit enables one input terminal of the amplifier to be maintained at a fixed reference potential and thus allows a solid state amplifier to be used. It also results in the current in the non-linear resist...