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Piezo Engineering Tutorial
C.3.4.3 Displacement With an External Spring Load
Figure C-5
illustrates a case where a piezo actuator or stage is driving against an external spring load.
In the case of a piezo stage or actuator without any applied load (case 1), the stroke of the piezo is given as
. For case 2 when driving against a spring load, the piezo stage stiffness (k
ΔL
1
(k
) act in series and decrease the overall stroke of the actuator. The stroke in case 2 is given by:
e
Equation 4
It is evident upon inspection of Equation 4 that in order to maximize the stroke of the piezo stage, the piezo
stage stiffness (k
) should be much larger than the external spring stiffness (k
p
Figure C-5:
Displacement of a piezo stage or actuator driving against an external spring
48
of stiffness k
e
Appendix C
QNP3 Hardware Manual
) and the external stiffness
p
).
e
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