Electricity: motive power systems – Positional servo systems – With stabilizing features
Patent
1978-07-24
1980-09-09
Truhe, J. V.
Electricity: motive power systems
Positional servo systems
With stabilizing features
318621, 318622, 318640, 318651, G05B 501
Patent
active
042219957
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.
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Breeden David E.
Denny James E.
Hamel Stephen D.
Indyk Eugene S.
The United States of America as represented by the United States
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