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Non-Contact Linear Actuator Position Sensor Having a PID-Compensating ControllerA position sensor or controller generates a response signal in existing armature windings of an actuator and detects the response signal to determine the position of the armature. To generate the response signal, the actuator includes a sensor excitation winding near the armature. Two sensor excitation windings can be provided, above and below the armature, to cancel out z components and thus allow for a variable gap. The sensor excitation winding or windings are supplied with an excitation signal to induce the response signal in the armature windings. The response signal is derived by differentially amplifying and frequency filtering a raw output of the armature windings. The response signal is demodulated to determine position. If a position controller rather than a mere sensor is desired, the position signal can be buffered, PID compensated, amplified, and fed back to the armature windings.
Document ID
20020005119
Acquisition Source
Marshall Space Flight Center
Document Type
Other - Patent
External Source(s)
MFS-31218
Authors
Dean C Alhorn
(Marshall Space Flight Center Redstone Arsenal, United States)
David E Howard
(Marshall Space Flight Center Redstone Arsenal, United States)
Date Acquired
August 20, 2013
Publication Date
June 12, 2001
Publication Information
Publisher: United States Patent and Trademark Office
Subject Category
Instrumentation And Photography
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-Patent-6,246,228
Patent Application
US-Patent-Appl-SN-209363
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