Browse Prior Art Database

ADAPTIVE ACCELERATION/DECELERATION COMMAND TECHNIQUE FOR STEPPER MOTOR CONTROL

IP.com Disclosure Number: IPCOM000025204D
Original Publication Date: 1984-Feb-29
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 58K

Publishing Venue

Xerox Disclosure Journal

Abstract

In U.S. Patent No. 4,349,770, there is disclosed a damping method for controlling the movement of a movable element, such as a printwheel, driven by a stepper motor. A sensor coupled to the motor drive shaft is responsive to rotation for generating a signal containing information indicative of the direction, speed and distance of movement of the movable element. When the movable element is within a predetermined distance of the desired stopping position, a controller controls the levels of the motor drive signals in dependence upon the direction information, for bringing the movable element to a final stop. This is accomplished as the controller selectively energizes accelerating or decelerating motor coils in dependence upon the direction information.

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XEROX DISCLOSURE JOURNAL

ADAPTIVE ACCELERATION/DECELERA- Proposed Classification TION COMMAND TECHNIQUE FOR STEPPER
MOTOR CONTROL
Lyle E: Morris

U.S. C1. 318/685 Int. C1. G05b 19/40

In U.S. Patent No. 4,349,770, there is disclosed a damping method for controlling the movement of a movable element, such as a printwheel, driven by a stepper motor. A sensor coupled to the motor drive shaft is responsive to rotation for generating a signal containing information indicative of the direction, speed and distance of movement of the movable element. When the movable element is within a predetermined distance of the desired stopping position, a controller controls the levels of the motor drive signals in dependence upon the direction information, for bringing the movable element to a final stop. This is accomplished as the controller selectively energizes accelerating or decelerating motor coils in dependence upon the direction information.

The present invention represents an improvement for making the closed loqp stepper motor control algorithm more responsive, by keeping track of the number of successive times a deceleration command is given. If more than a small, predetermined number of similar signals are given, then the deceleration coil current may be increased (to increase motor torque). In other words, where subsequent sample times result in the same polarity error signal, the system causes a
.correspondingly greater command and/or gain to be applied to reverse the...