Browse Prior Art Database

Stepping Motor Control

IP.com Disclosure Number: IPCOM000091556D
Original Publication Date: 1968-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Abraham, DG: AUTHOR [+2]

Abstract

The Motor Drive Circuit is energized when a negative-going start pulse is applied to line 1. Such pulse is applied to Pedestal circuit 10 via delay dropout circuit 12. Energization of circuit 10 completes a return circuit for the Motor Drive Circuit and switches the circuit from the hold mode, where a low voltage is applied to motor coils, to the run mode with full voltage applied. This same pulse via Inverter 14 is applied after a delay determined by the duration of the pulse from Holdover Single-Shot 16 to +And 18. The output of +And 18 is fed to Stopping Sequence Generator Circuit 20 whose output 7 is applied to the Motor Drive Circuit.

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 74% of the total text.

Page 1 of 2

Stepping Motor Control

The Motor Drive Circuit is energized when a negative-going start pulse is applied to line 1. Such pulse is applied to Pedestal circuit 10 via delay dropout circuit 12. Energization of circuit 10 completes a return circuit for the Motor Drive Circuit and switches the circuit from the hold mode, where a low voltage is applied to motor coils, to the run mode with full voltage applied. This same pulse via Inverter 14 is applied after a delay determined by the duration of the pulse from Holdover Single-Shot 16 to +And 18. The output of +And 18 is fed to Stopping Sequence Generator Circuit 20 whose output 7 is applied to the Motor Drive Circuit.

This delay is necessary to prevent unwanted oscillations in the motor when the circuit is first energized. The first pulse to the Motor Drive Circuit causes motor 24 to advance one step. During the advance, encoder 26 emits a signal to photoamplifier 28. The output from photoamplifier 28 is applied to -And 30 to provide a signal to +And 18 which in turn applies a signal to SSC 20 to cause it to produce a pulse on line 7 to the Motor Drive Circuit for successive motor operations. As long as line 1 is negative, the motor continues to advance one step at a time in the described manner.

The motor is stopped when the negative-going pulse on line 1 is removed and the line returns to zero. The immediate return of circuit 10 to the condition where a lower hold voltage is applied to the run winding is withheld dur...