Browse Prior Art Database

Stepping Motor Control

IP.com Disclosure Number: IPCOM000095090D
Original Publication Date: 1965-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Thompson, LJ: AUTHOR

Abstract

Motor 2 has terminals that are energizable two at a time to establish a selected position for the rotor. A control circuit receives pulses from pulse generator 3 and energizes the motor 2 terminals in a sequence to rotate motor 2 through a selected number of steps.

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Stepping Motor Control

Motor 2 has terminals that are energizable two at a time to establish a selected position for the rotor. A control circuit receives pulses from pulse generator 3 and energizes the motor 2 terminals in a sequence to rotate motor 2 through a selected number of steps.

The control circuit includes a counter having interconnected binary trigger stages. The first stage is connected to receive the input pulses. Each stage is connected to receive a direction control. As pulses appear at the input, the outputs of the counter stages are operated through a counting sequence. The first two stages of the counter count through a sequence of four steps corresponding to the four ways of energizing the motor terminals. A logic circuit operates as a decoder to translate the output state of the counter into signals indicating which windings are to be energized. Drivers connected to receive the output or the decoder energize the motor windings.

Motor 2 is preferably constructed so that it advances much less than a quarter of a revolution for each pulse. Thus, the first two stages of the counter are cycled several times in driving motor 2 between the limits of its rotation. The counter has additional stages, only one is shown, that cooperate with the first two stages to indicate the position of motor 2. The outputs of each counter stage can be connected to a comparator circuit. This receives inputs that define a selected motor 2 position in terms of the counter...