Browse Prior Art Database

Stepper Motor Control Method

IP.com Disclosure Number: IPCOM000101928D
Original Publication Date: 1990-Sep-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 39K

Publishing Venue

IBM

Related People

Do, PK: AUTHOR [+3]

Abstract

Disclosed is a method of controlling a stepper motor that provides better control of the motor's inputs by the use of special operand fields. These fields form a table of information that allows custom software to provide optimum control of the chopper circuit that drives the stepper motor.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 81% of the total text.

Stepper Motor Control Method

       Disclosed is a method of controlling a stepper motor that
provides better control of the motor's inputs by the use of special
operand fields.  These fields form a table of information that allows
custom software to provide optimum control of the chopper circuit
that drives the stepper motor.

      Each operand field contains four elements that are used by the
control software.  The first element is an indicator that tells the
control software whether the current time information is to be used
for a step or a chop.  If the indicator shows that it is a chop,
then the motor is energized, but the motor phases are not advanced.
This allows mixing of stepping and chopping in order to more
accurately control the energy applied to the motor.  The second
element within the operand field is a count field that controls how
many times the time/step/chop information is to be repeated.  This
feature provides the flexibility of being able to repeat steps or
chops many times.  The third element is used to flag the time/step
information that is used for moving the motor at maximum speed.  The
maximum speed time/step information is used until motor deceleration
is required.  The fourth element is used to flag to the software that
all stepping and chopping has been completed for the current move.
This permits varying amounts of chopping after the last motor step
has been completed.

      The control of a stepper motor, as described, o...