Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1995-11-13
1998-02-03
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
H01L 4109
Patent
active
057148317
ABSTRACT:
A piezoelectric positioner is accurately controlled to reduce the settling time of the positioner in response to a commanded change in position using velocity state feedback control. The velocity state feedback control uses an estimated velocity of the piezoelectric positioner generated by a velocity observer to provide active damping. The velocity observer has as inputs the same control signal which is provided to the piezoelectric positioner itself and the actual measured position of the positioner, and produces as an output the estimated velocity of the positioner. The velocity observer includes a model of the piezoelectric positioner's response to the control signal. The model includes estimates of physical parameters of the positioner including the physical mass, physical damping, and physical stiffness of the positioner. Position and velocity state feedbacks are used within the observer model, in combination with the actual measured position of the positioner, to drive a modeled position of the positioner to equal the actual position, thereby also to increase the accuracy of the velocity estimate. The observer state feedbacks reduce errors in the modeled position due to inaccuracies in the parameter estimations, noise, and unmodeled physical disturbances. The positioner control with active damping may be implemented in any system using a piezoelectric positioner. Active mass feedback, using an acceleration observer, may be added to the active damping feedback in piezoelectric systems in which the handling of force disturbances is required.
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Lagally Max G.
Lorenz Robert D.
Walker Steven H.
Dougherty Thomas M.
Wisconsin Alumni Research Foundation
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