These actuators’ height is restricted through bending & shear stresses, although they are frequently merged within multi-axis systems by longitudinal actuators. The resulting displacement takes place within the horizontal plane so that a shear-type motion can be created. In shear piezo actuators, the different elements are horizontally polarized & the electrical field can be applied orthogonally. These types of actuators are related to longitudinal type actuators because they have multiple piezo elements layers but they vary in how the voltage is applied & the type of motion formed. The force density of these actuators is high typically 30 N/mm^2 range and also high resonant frequencies so that these actuators are used in dynamic applications. These types of actuators use the piezoelectric effect for generating linear displacements which range from 0.1 – 0.15% of the length of the actuator. Longitudinal actuators are also known as piezo stacks which are formed by coating several piezo elements on top of each other so that each element’s expansion effect will generate a useful force & movement. Once we apply an electrical input, one ceramic layer bonds whereas the other one enlarges so that the actuator will bend. They are usually in the coinciding polarization direction through an electrically parallel connection. This type of actuator uses two thin piezoelectric ceramic layers that are connected. In sequence, this deflection gives a big stroke through the least blocking force as compared to the stack actuator. The Stripe Actuator is known as a bending actuator, used to generate a large mechanical deflection reasonably in response to an electrical signal. Attaining this normally involves coating materials, bare stacks, or covering them within stainless steel. In any case, co-fired or discrete, it is feasible to insulate them protectively from mechanical stresses & environmental impacts. The operating voltage of these can be 200 volts.

But, they use high-temperature sintering of the ceramic pile & complete electrode. If the actuators are co-fired stack actuators then these are also known as monolithic stacks which do not use adhesives. The typical operating voltage ranges from 500V to 1,000V. If it is certainly discrete, then its complex structures are designed by using discs or individually stacking finished piezoelectric ceramic rings & metal electrode foil through an adhesive. Based on your design necessities, this type of actuator is either discrete or co-fired. Types of Piezoelectric Actuator Piezo Stack ActuatorsĪ Piezo stack actuator is used to provide a low stroke through a high blocking energy.

Piezo ceramic servo motors