Linear motor drive system for continuous-path closed-loop position control of an object
Patent
·
OSTI ID:863650
- Oak Ridge, TN
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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
- DOE Contract Number:
- W-7405-ENG-26
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4221995
- OSTI ID:
- 863650
- Country of Publication:
- United States
- Language:
- English
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001
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air-bearing
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coil
command
continuous
continuous-path
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converts
derived
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numerical
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numerical controlled
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output
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platform
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position
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power
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precision
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servo
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signal
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slide
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stability
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summed
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tend
utilized
utilizes
velocity
001
100
air-bearing
amplifier
closed-loop
closed-loop position
coil
command
continuous
continuous-path
control
controlled
converts
derived
drive
driven
error
error signal
errors
feedback
feedback information
feedback signal
filtered
following
following error
friction
inch
inches
induction motor
information
input
interferometer
introduce
irregularities
laser
laser interferometer
linear
linear motor
linear-induction
machine
microprocessor
minimize
minimize friction
minute
monitor
motor
motor drive
mounted
movement
negative
numerical
numerical control
numerical controlled
operate
output
output signal
output signals
platform
platform driven
position
position control
positioning
power
power signal
precision
programmed
provide
provided
required
serves
servo
servo-positioning
signal
signals
slide
slides
slideway
stability
stable
summed
support
tend
utilized
utilizes
velocity