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Appendix D
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
62
amp
a + b/s
_
Fig. D.3 Open loop and closed loop control
Fig. D.4 Closed loop response
actuator
amp
actuator
sensor
demand position
moving
part
moving
part
HA0365T Rev Dk Jan 2017
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