Piezoelectric Actuators - Introduction
Multilayer Fabrication
Multilayer actuators are fabricated
from thin sheets of tape-cast ceramic. Silver-palladium
electrodes are deposited on the sheets by screen printing.
The sheets are then stacked and fired. This co-firing
technology results in a compact device with high stiffness,
low drive voltage, high volumetric efficiency and fast
response time.
The
internal structure of a multi-layer actuator is shown
schematically below:
Dl =
n.V.d33 where n is the number of active layers, Dl is the
displacement, d33 the strain constant, and V is the applied
voltage (<300 V).
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