in small pieces.
To put it in a nutshell: The idea of piezo stack actuators is as simple as it is effective: Piezo are made of active material. The length of the piezoelectric stack is directly controlled by applying an electrical voltage. When the solid piezoelectric body expands immediate reaction take place which provides strong, fast, and precise actuation. This effect is most suitable for innovative positioning tasks. Conversely, a piezo stack actuator generates electrical voltages when forces are applied. Stacks are also ideal devices to design energy harvester or piezo generators for low power applications. These generators convert vibrations (which represent mechanical power) to electrical power.
A modern piezo actuator is a co-fired multilayer ceramics body made of high performing piezoelectric ceramics material. The actuator is typically a rectangular block with a size of 5 mm by 5 mm and height of 18 mm. Stacks with other dimensions are available. Internal and outer electrodes are carefully designed to provide extraordinary long life and high cycle number of actuator strain.
Piezo stack actuation is a solid-state technology, which enables high technology solutions. Due to unique properties piezoelectric actuation extends the portfolio of established actuator principles with regard to important features:
Keywords: Piezoceramic / Piezo Aktuator / Piezo Actuator/ Piezo Actor
Due to the excellent controllability piezoelectric actuators are extremely suitable for precision positioning and fast high-force actuation. Piezoelectric actuators enable ultra-precise devices that achieve accuracies of atoms.
The piezoelectric effect is characterized by a high speed. The electro-mechanical conversion is directly related to the construction of the electric field in the material. The acceleration involved is enormous and values of several thousand g can be obtained. Because of their very high electrical insulation resistance piezoelectric actuators have low power consumption in static application. In contrast, electromagnetic drives consume already on hold energy (coil currents) and are much slower. Piezoelectric actuators develop high actuatoric forces and also allow miniaturization.