A device that produces motion (displacement).
The maximum force an actuator can generate if blocked by an infinitely rigid restraint.
A polycrystalline, inorganic material.
Closed loop operation:
The actuator is used with a position sensor, providing feedback to the position servo controller compensating for nonlinearity, hysteresis and creep (see open loop).
Strain produced per unit stress. The reciprocal of stiffness.
An unwanted positive or negative increase in the displacement over time.
The temperature at which the crystalline structure changes from a piezoelectric (non-symmetrical) to a non-piezoelectric (symmetrical) form. At this temperature Piezo ceramics looses the piezoelectric properties.
A region of electric dipoles with similar orientation.
Acronym for High Voltage Piezo (actuator).
Hysteresis is based on crystalline polarization effects and molecular friction and occurs when reversing direction. Hysteresis is not to be confused with backlash.
Acronym for Low Voltage Piezo (actuator).
An actuator manufactured in a fashion similar to multilayer ceramic capacitors. Active ceramic material and electrode material are "co-fired" in one step. Layer thickness is typically on the order of 20 to 100 µm.
Open loop operation:
The actuator is used without a position sensor. Displacement roughly corresponds to the drive voltage. Creep, nonlinearity and hysteresis are not compensated for.
Materials that change their Dimensions when a voltage is applied and produce a charge when pressure is applied.
The electric orientation of molecules in a piezoelectric material.
Acronym for Plumbum (lead) Zirconate Titanate. Polycrystalline ceramic material with piezoelectric properties. Often used as acronym for piezo translator.
The spring constant (of a piezo actuator).
An actuator that produces linear motion (displacement).