The description of standard actuators is arranged for increasing crossection/load capability. Low voltage multilayer actuators are only available for small and medium crossections. Highload actuators are preferentially made from discrete stacks (high voltage types). Always try to select an actuator to match as tight as possible your requirements. Oversizing one parameter often results in the reduction of the performance in another aspect: e.g. a longer stack shows big travel, but stiffness and resonance frequency are equivalently reduced. Oversizing of actuator's crossection (volume) requires more powerful (and more expensive) supplies for dynamic operation, leading to a pronounced selfheating.
Voltage Ranges
For some actuator classes stacks are offered for similar mechanical properties, but with
low and high operating voltages. Usually, actuators are selected for operating voltages as
low as possible, so that low voltage multilayer stacks are preferentially used, e.g. in
optomechanics. High voltage actuators are chosen for several other reasons: From a
historical point of view of actuator development, high voltage actuators were for a long
time the only available PZT actuatortype and therefore a lot of drivers exist, which are
often used for new projects. To adapt the whole system to new operating conditions, an
actuator with altered mechanical properties has to be introduced, operating again in the
high voltage range. Another reason for selecting high voltage actuators is because of
power efficiency of drivers and selfheating of actuators for highly dynamic operation: for
these cases, the combination of a high voltage actuator with a low voltage supply can be
reasonable (see "amplifiers"). Also the
PZT material of high voltage actuators show somewhat less electrical losses than the
multilayer material.
Nomenclature: ordering code: e.g. |
||
| |CTC-PSt 150/5/50/ | | |PiezoelectricStack for 150V |Stackdiameter/diagonal: 5mm |nominal travel at +150V: 50µm |
|Gh10/VS 10 | | | | | | |with casing diameter 10mm |Gh: without internal prestress |VS: with internal prestress
|
|xx.yy | | | | | | | | | | | |options: |e.g. VbS ball tip |
General Options
Beside the standard design of he actuators, there are a lot of options to adapt them to
special requirements:
Vacuum operations - actuators are built up with adhesive showing very low vapor pressure. Versions with casing show orifices for gas exhaust.
Increased temperature ranges - special low temperature/high temperature versions are offered on request.
Position sensors - strain gages can be applied to the PZT stacks.
Potential free design - for the standard actuators with casing, the casing is connected to the operating ground reference of the stack. For some applications, it is useful to separate the casing from stack's ground. This is offered on request, the user has to ground the metal casing separately.
Negative polarity - standard actuators with casing for negative polarity are available on request.
| Classification of
piezoelectric stacks | Mounting of Piezoelectric
actuators |
| Operating Performance of Piezoelectric
actuators |
| Notes on Technical Data | Selection Guide
|
| Custom Designed Actuators | Safety
Instructions |
| Linear Actuators |
Motor Controllers | DC Servo Motors | Translation Tables | |
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92653
Toll Free: (800) 991-1420
Tel. (949) 770-9911 ~ Fax (949) 770-2492
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