Two feedback loops are better than one

Couplings between motors and loads in most motion-control systems are not sufficiently rigid. When a controller commands the motor to move a load, compliance in the coupling lets the motor and load oscillate or seek slightly different positions. This action produces a small error commonly known as b...

Full description

Saved in:
Bibliographic Details
Published in:Machine design 1999-04, Vol.71 (7), p.85-88
Main Author: Tal, Jacob
Format: Magazinearticle
Language:English
Subjects:
Accuracy
Bandwidths
Control algorithms
Control equipment industry
Electrical engineering
Feedback control systems
Innovations
Load
Motion control
Motors
Process control equipment
Sensors
Systems stability
Trouble shooting
Velocity
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Couplings between motors and loads in most motion-control systems are not sufficiently rigid. When a controller commands the motor to move a load, compliance in the coupling lets the motor and load oscillate or seek slightly different positions. This action produces a small error commonly known as backlash. Designers faced with the problem usually install a feedback sensor on the motor or load to let the controller compensate for such errors. The search for a feedback-control method that corrects for complete motion trajectories and does it quickly led to developing a continuous dual-loop configuration. An improved method recently developed at Galil is called the general dual loop. The structure of the dual loop is preserved, but PID functions are divided differently.
ISSN:0024-9114
1944-9577