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Browse Prior Art Database

Digital Acceleration Position Control of DC Motor

IP.com Disclosure Number: IPCOM000075847D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Dohanich, GJ: AUTHOR

Abstract

The block diagram illustrates a motor control system arranged to perform with predetermined acceleration/deceleration characteristics, as exemplified in a document transport drive.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 62% of the total text.

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Digital Acceleration Position Control of DC Motor

The block diagram illustrates a motor control system arranged to perform with predetermined acceleration/deceleration characteristics, as exemplified in a document transport drive.

The output of the motor shaft encoder is fed to a binary counter 3. The transport encoder output drives a scaling counter 5. The scaling counter must be capable of counting to a maximum value commensurate with a piecewise approximation of the desired characteristic curve. In the example shown, five control lines govern the function of the scalcounter, to provide the following exemplary counts: 16:1 Count to 16; on the 16th count give one output and reset to 0. 4:1 Count to 4; on the 4th count, give one output and reset. 2:1 Count to 2; on the 2nd count, give one output and reset. 3:2 Count to 3; give outputs on 2nd and 3rd count (or 1&2, 1&3) and reset. 6:5 Count to 6; give 5 outputs (1,2,3,4,5 or 2,3,4,5,6 or ....) and reset.

The output of the scaling counter 5 drives a binary counter 7, which accumulates the piecewise approximation of the desired position. The control decode 9 examines the output of the binary counter 7 and generates the control lines for the scaling counter 5.

The comparator 11 examines the outputs of the binary counters 3 and 7 to determine the relative position of motor and scaled transport (desired motor position).

The initiation of an accelerate command sets the counters 3 and 7 to zero and establishes an increme...