Aerotech QNP3 Series, Руководство по оборудованию

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QNP3 Hardware Manual Piezo Engineering Tutorial
C.3.4.2 Displacement With a Constant External Load
Figure C-4 illustrates the case of a piezo actuator or stage with a constant, external load applied.
In the case of a piezo stage or actuator without any applied load (case 1), the stroke of the piezo is given as
ΔL
1
. When a mass is applied to the piezo stage (with expansion in the direction of gravity), the initial
deflection ( ΔL
0
) is calculated as:
Equation 2
where k
p
is the stiffness of the piezo stage in the direction of motion and m is the applied mass. With mass m
applied to the piezo stage, the stage is compressed a distance ΔL
0
but the stroke ΔL
2
remains the same as
the unloaded stage.
Figure C-4: Displacement of a piezo stage or actuator with a constant external load
That is:
Equation 3
www.aerotech.com Appendix C 47