Page 59
ETN051885-D02
K-Cube Inertia Piezo Motor Driver
Fig. C.3 Open loop and closed loop control
The result of using closed-loop control is a linear relationship between demand
(voltage) and measured position – see Fig. C.4, in contrast to open loop control – see
Fig. C.2.
Fig. C.4 Closed loop response
amp
actuator
demand
moving
part
open loop control
amp
actuator
sensor
a + b/s
demand
moving
part
closed loop control
+
_
real position
demand position