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Basic Designs of Piezoelectric Positioning Elements

Stack Design
The active part of the positioning element consists of a stack of ceramic disks separated by thin metallic electrodes. Maximum operating voltage is proportional to the thickness of the disks. PI stack actuators are manufactured with layers from 0.02 to 1 mm thickness.

Stack elements can withstand high pressure and show the highest stiffness of all piezo actuator designs. Since the ceramics cannot withstand large pulling forces, spring preloaded actuators are available. Stack models can be used for static and dynamic operation. For further information see "Maximum Applicable Forces (Compressive Load Limit, Tensile Load Limit)", click here

Displacement of a Piezo stack actuator can be estimated by the following equation:

DL » d₃₃*n * U       (4-24)

where
d₃₃ = strain coefficient (field and deflection in polarization direction) [m/V]

n = number of ceramic layers

U = operating voltage [V]

Example:
P-845, etc. (click here for "Piezo Actuators" section)

Electrical Design of a Stack Translator.

Mechanical Design of a Stack Translator.

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