Piezo-actuators
Multilayer stacks need a careful electrical insulation of the surface of the active PZT-ceramics to separate the internal layer electrodes electrically. Currently an “opinion” is promoted as “leading edge” technology, that a passive ceramic layer coating is the answer to everything especially in contrast to polymer coated elements.
Practice shows, that this philosophy works with only gradual advantage for limited static applications on the condition, that the strain levels are held below 0.1%.
Regarding the full spectrum of piezo application profiles it has turned out, that polymer coated elements have dramatic advantages under general application aspects!
A special highly mineral filled expoxy (MFE) coating provides a remarkable on all around mechanical preloading of the actuator ceramic. This preload pressure is the consequence of the elastic polymer shrinking during the cure process.
The mechanical stability and strength of the stack against bending forces is dramatically enhanced thereby compared to purely ceramic standard isi-structures with their stress relief notches in the stack surface structure.
Resonant bending modes are highly damped by the polymer.
The utmost stability is therefore given for the osi-type piezo elements PSt 150 with the highly stable ceramic structure in superposition with the further enhancement of mechanical stability by the standard MFE coating.
This works excellently even for bending sensitive large aspect ratio’s of the osi-based PSt 150 actuators (length/cross section).
In industrial use, PIEZOMECHANIK’s osi-based large stroke elements ( > 100 µm) are permanently cycled with high strain rates
> 0.1 % and high dynamics since years without failure.
In total, cycle numbers have been proofed exceeding 1011 under the above conditions.
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Piezomechanics: An introduction
A survey about:
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Piezo-mechanical and electrostrictive stack and ring actuators.
Product range and technical data Main catalogue:
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Low voltage co-fired multilayer stacks, rings and chips for actuation
contains
For longer elements and cased versions with preload: check main catalogue
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High temperature, high dynamic actuators PSt-HD200
broschure on special stack actuators based on Diesel fuel-piezo-injector technology with and with out casing for high dynamic /high temperature applications
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Piezo-benders bimorphs, piezo-electric tubes
Operation and technical data of
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Piezo-based optomechanics
information and technical data on special piezo-elements for use in coherent optics (e.g. optical phase shifting, interferometry)
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Piezo vibrations and piezo shakers PiSha
Piezo-technology provides an excellent base for high-frequency /high force shaking even with rather tiny elements. This brochure describes the general features high frequency piezo-shaking elements and basic test arrangements.
Useful for modal analysis, quality testing Piezomechanik delivers piezo-shakers on custom design base only |
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High power piezoelectric axial shockwave generation
Application note on high power shockwave generators for material characterization, mechanical testing, impact physics
Hopkinson bar, "piezoactive" bar |
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Piezo impactors/accelerators PIA
Piezo-technology allows highly efficient generation of mechanical shocks with high force levels.
This brochure describes the general featurures of shock-generating elements and basic test arrangements. Applications are modal analysis, material data investigation, quality testing, Piezomechanik delivers piezo-shock generators on custom design base only |
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Piezo-Pyro-Shock-Simulator PPSS
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Electronics
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Main catalogue: Electronic supplies for piezomechanics - technical data
shows technical description and data of electronics supplies, ranging from
low power, low noise, semi-bipolar amplifiers for positioning, up to high-power/multi- kilowatt switching amplifiers RCV for active vibration control Special versions on request |
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Feedback position control PosiCon.an
contains:
Requires option ”position sensing” for actuator |
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OptiSeek piezo stabilization
provides self-seeking optimum stabilization of position tuned optical (and other) arrangements. “Dithering”- based feedback.
Main fieldsof application: coherent optics, fiber optics. |
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Strain gage amplifiers for position detection
for position measurement together with actuator option “position detection” (see main catalogue) |



