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open loop control
demand
closed loop control
demand
+
_
The result of using closed-loop control is a linear relationship between demand
(voltage) and measured position – see Fig. D.4, in contrast to open loop control – see
Fig. D.2.
real position
Rev E June 2023
amp
a + b/s
amp
Fig. D.3 Open loop and closed loop control
Fig. D.4 Closed loop response
Appendix D Piezo Operation - Background
actuator
actuator
sensor
demand position
moving
part
moving
part
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