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Stepping Motor Control Circuit

IP.com Disclosure Number: IPCOM000093910D
Original Publication Date: 1966-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Allen, FK: AUTHOR [+2]

Abstract

The circuit is for controlling a stepping motor for operation in either direction. A signal is applied to input terminal 10 to produce motor movement in the forward direction. An input pulse to terminal 12 causes the motor to move in the reverse direction. A single input pulse at terminals 10 or 12 causes a single step in the motor operation. A continuous up level at the input terminals causes the motor to step continuously at its maximum stepping rate. A quantizer circuit 14f or 14r is provided to produce the output signal which is coupled to energize the appropriate motor winding at terminals 18 and 20.

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Stepping Motor Control Circuit

The circuit is for controlling a stepping motor for operation in either direction. A signal is applied to input terminal 10 to produce motor movement in the forward direction. An input pulse to terminal 12 causes the motor to move in the reverse direction. A single input pulse at terminals 10 or 12 causes a single step in the motor operation. A continuous up level at the input terminals causes the motor to step continuously at its maximum stepping rate. A quantizer circuit 14f or 14r is provided to produce the output signal which is coupled to energize the appropriate motor winding at terminals 18 and 20.

Quantizer circuits 14 have a binary output. The circuits 14 are such that, if the input voltage is more positive than a first voltage, Va, the output is at an up level. If the input voltage is more negative than a second reference voltage Vb, the output is at a down level. When the input voltage is held between voltages Va and Vb, or when the input is open-circuited, the output remains stable. The inputs to circuits 14 are provided by summing networks 22f and 22r. The inputs to the summing networks is provided by modulator circuits 26i, 28f, 26r and 28r. The modulator circuits are such that when the modulator gate input at terminal 34 is up, the modulator output follows the corresponding input signal at terminal 35. When the gate input signal is down, the output is isolated from the input signal. The output can be open-circuited or...