12/3/2023 0 Comments Piezo electric materials![]() 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 actuators are available in different types like stack, stripe, longitudinal, shear, tube, and contracting. The capacitance is a task of the excitation voltage frequency and resonance is the frequency where the piezoelectric actuators react with the highest o/p amplitude. For piezoelectric actuators, stiffness is the energy required to extend the device through a certain quantity, usually stated in terms of Newtons for each micrometer. The term stiffness is used to describe the energy required to attain a certain deformation of an arrangement. The factors that need to consider while using these actuators are capacitance, stiffness & resonant frequency. The important specifications of piezoelectric actuators mainly include force, displacement, & operating voltage. They are particularly used for positioning, controlling vibration & quick switching applications. These devices are Ultrasonic actuators which are designed specifically to generate strokes of numerous micrometers at ultrasonic frequencies above 20 kHz. The configuration of the piezoelectric actuator can change greatly based on application. The working principle of a piezoelectric actuator is, once the voltage is applied to piezoelectric actuators then they generate a small displacement through a high force capacity, so these are used in many applications like ultra-precise positioning, in high forces handling & generation in stationary or dynamic conditions. Piezoelectric Actuator Working Principle & Operation As compared to electromagnetic actuators, piezoelectric actuators have some features like flexible design, compact size & provide sub-micrometer or nanometer positioning.
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