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Title: Control system to reduce the effects of friction in drive trains of continuous-path-positioning systems. [Patent application]

Abstract

An improved continuous-path-positioning servo-control system is provided for reducing the effects of friction arising at very low cutting speeds in the drive trains of numerically controlled cutting machines, and the like. The improvement comprises a feed forward network for altering the gain of the servo-control loop at low positioning velocities to prevent stick-slip movement of the cutting tool holder being positioned by the control system. The feed forward network shunts conventional lag-compensators in the control loop, or loops, so that the error signal used for positioning varies linearly when the value is small, but being limited for larger values. Thus, at higher positioning speeds there is little effect of the added component upon the control being achieved.

Inventors:
Issue Date:
OSTI Identifier:
6292876
Assignee:
Dept. of Energy TIC; ERA-06-035337; EDB-81-117055
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; CUTTING TOOLS; COMPUTERIZED CONTROL SYSTEMS; FRICTION; POSITIONING; SERVOMECHANISMS; CONTROL EQUIPMENT; CONTROL SYSTEMS; EQUIPMENT; TOOLS; 420200* - Engineering- Facilities, Equipment, & Techniques

Citation Formats

Green, W.L. Control system to reduce the effects of friction in drive trains of continuous-path-positioning systems. [Patent application]. United States: N. p., 1980. Web.
Green, W.L. Control system to reduce the effects of friction in drive trains of continuous-path-positioning systems. [Patent application]. United States.
Green, W.L. Mon . "Control system to reduce the effects of friction in drive trains of continuous-path-positioning systems. [Patent application]". United States.
@article{osti_6292876,
title = {Control system to reduce the effects of friction in drive trains of continuous-path-positioning systems. [Patent application]},
author = {Green, W.L.},
abstractNote = {An improved continuous-path-positioning servo-control system is provided for reducing the effects of friction arising at very low cutting speeds in the drive trains of numerically controlled cutting machines, and the like. The improvement comprises a feed forward network for altering the gain of the servo-control loop at low positioning velocities to prevent stick-slip movement of the cutting tool holder being positioned by the control system. The feed forward network shunts conventional lag-compensators in the control loop, or loops, so that the error signal used for positioning varies linearly when the value is small, but being limited for larger values. Thus, at higher positioning speeds there is little effect of the added component upon the control being achieved.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {12}
}