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Title: Linear motor drive system for continuous-path closed-loop position control of an object

Abstract

A precision numerical controlled servo-positioning system is provided for continuous closed-loop position control of a machine slide or platform driven by a linear-induction motor. The system utilizes filtered velocity feedback to provide system stability required to operate with a system gain of 100 inches/minute/0.001 inch of following error. The filtered velocity feedback signal is derived from the position output signals of a laser interferometer utilized to monitor the movement of the slide. Air-bearing slides mounted to a stable support are utilized to minimize friction and small irregularities in the slideway which would tend to introduce positioning errors. A microprocessor is programmed to read command and feedback information and converts this information into the system following error signal. This error signal is summed with the negative filtered velocity feedback signal at the input of a servo amplifier whose output serves as the drive power signal to the linear motor position control coil.

Inventors:
 [1]
  1. Oak Ridge, TN
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
863650
Patent Number(s):
4221995
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G05 - CONTROLLING G05B - CONTROL OR REGULATING SYSTEMS IN GENERAL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
linear; motor; drive; continuous-path; closed-loop; position; control; precision; numerical; controlled; servo-positioning; provided; continuous; machine; slide; platform; driven; linear-induction; utilizes; filtered; velocity; feedback; provide; stability; required; operate; 100; inches; minute; 001; inch; following; error; signal; derived; output; signals; laser; interferometer; utilized; monitor; movement; air-bearing; slides; mounted; stable; support; minimize; friction; irregularities; slideway; tend; introduce; positioning; errors; microprocessor; programmed; command; information; converts; summed; negative; input; servo; amplifier; serves; power; coil; feedback signal; power signal; induction motor; motor drive; output signals; output signal; error signal; position control; minimize friction; feedback information; laser interferometer; numerical control; closed-loop position; following error; linear motor; numerical controlled; platform driven; /318/

Citation Formats

Barkman, William E. Linear motor drive system for continuous-path closed-loop position control of an object. United States: N. p., 1980. Web.
Barkman, William E. Linear motor drive system for continuous-path closed-loop position control of an object. United States.
Barkman, William E. Tue . "Linear motor drive system for continuous-path closed-loop position control of an object". United States. https://www.osti.gov/servlets/purl/863650.
@article{osti_863650,
title = {Linear motor drive system for continuous-path closed-loop position control of an object},
author = {Barkman, William E},
abstractNote = {A precision numerical controlled servo-positioning system is provided for continuous closed-loop position control of a machine slide or platform driven by a linear-induction motor. The system utilizes filtered velocity feedback to provide system stability required to operate with a system gain of 100 inches/minute/0.001 inch of following error. The filtered velocity feedback signal is derived from the position output signals of a laser interferometer utilized to monitor the movement of the slide. Air-bearing slides mounted to a stable support are utilized to minimize friction and small irregularities in the slideway which would tend to introduce positioning errors. A microprocessor is programmed to read command and feedback information and converts this information into the system following error signal. This error signal is summed with the negative filtered velocity feedback signal at the input of a servo amplifier whose output serves as the drive power signal to the linear motor position control coil.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {1}
}

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