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Pulse Injection Stepper Motor Control

IP.com Disclosure Number: IPCOM000079512D
Original Publication Date: 1973-Jul-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Abraham, DG: AUTHOR [+2]

Abstract

Starting control of a stepper motor having an open-loop oscillator control is obtained by utilizing a pulse injection arrangement, whereby a plurality of pulses are supplied in rapid succession at the proper time to the drive circuits for the stepper motor, giving a negative torque to the motor which prevents an overshoot in velocity.

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Pulse Injection Stepper Motor Control

Starting control of a stepper motor having an open-loop oscillator control is obtained by utilizing a pulse injection arrangement, whereby a plurality of pulses are supplied in rapid succession at the proper time to the drive circuits for the stepper motor, giving a negative torque to the motor which prevents an overshoot in velocity.

The figure exemplifies a control setup for a four-phase motor. A plurality of driver circuits DRS supply pulses of sufficient magnitude and proper phase relationship to the windings of a stepper motor SM, under control of the outputs of a trigger arrangement T.

When a positive G0 signal is initiated, a single-shot 1 is set ON and delivers a positive pulse to set ON START single-shot 10. The positive output pulse from single-shot 10 is delivered to 0R gate 11, triggers T, and driver circuits DRS to give the first field change to stepper motor SM. Oscillator 12 is also started by the GO signal and produces positive output pulses to continue to drive the motor.

When single-shot 1 times out, the negative transient is passed to inverter 13 which in turn sets ON a single-shot 2. The positive output pulse from single-shot 2 is the first of a series of three injection pulses, which are transmitted to drive triggers T. This output pulse also sets ON single-shot 3 and when the positive output pulse from single-shot 3 times out, the negative transient is passed to inverter 14 which in turn sets ON single-s...