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Browse Prior Art Database

Step Motor Control

IP.com Disclosure Number: IPCOM000097968D
Original Publication Date: 1961-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Arthur, ME: AUTHOR

Abstract

This logic circuit controls a bi-directional step motor in 45 degree increments with constant torque in all positions.

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Step Motor Control

This logic circuit controls a bi-directional step motor in 45 degree increments with constant torque in all positions.

The motor position is the vector result of the magnetic fields developed by exciting one leg of each of the two motor windings for positions 2, 4, 6 and 8. Alternate positions 1, 3, 5 and 7 are controlled by excitation of a single leg. Constant torque in all positions is maintained by applying 1. 707 times the rated voltage of each leg through a series resistance equal to 0. 707 times the resistance of one leg.

An input pulse, forward -F or reverse -R, causes the appropriate Y1, Y2 or Y3 trigger to change its state. These functions Y1, Y2 and Y3 control the drivers to effect a 45 degrees step clockwise or counterclockwise. Upon termination of the input pulse, the steering trigger Y4 changes its state, thus, completing the preparation of Y1, Y2 and Y3 inputs for the next forward or reverse pulse.

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