![]() ![]() A rapid drive voltage change results in a rapid position change. How Fast Can a Piezo Actuator Expand? Fast response is one of the desirable features of piezo actuators. The phase response of a Piezo system can be approximated by a second order system and is described by Increasing the spring preload on the actuator does not significantly affect its resonant frequency. The above equations show that increasing the mass on the actuator by a factor of 4 will reduce the response (resonant frequency) by a factor of 2. Resonant frequency with additional mass M. When adding a mass to the actuator the resonant frequency drops according to the following equation: M eff = effective mass (about 1/3 of the mass of the ceramic stack plus any installed end pieces) ĭue to the non-ideal spring behavior of Piezo ceramics, the theoretical result of the above equation does not necessarily match the real-world behavior of a Piezo system. Resonant frequency of an ideal spring/mass system. Without a guiding system there is a potential for tilt oscillations and other non-axial forces that may damage the Piezo ceramics. diaphragm type) is recommended when heavy loads or large mechanical parts (compared to the piezo actuator diameter) are moved dynamically. The maximum permissible forces must be considered when choosing an operating frequency.ĭynamic forces at 1000 Hz, 2 µm peak-peak, 1 kg load are approximately ± 40 N.Ī guiding system (e.g. In sinusoidal operation with frequency f and the amplitude DL/2, peak forces can be expressed asĭynamic forces on a Piezo in sinusoidal operation with frequency f. Preload should be around 20 % of the compressive load limit, with soft preload springs soft compared to the Piezo stiffness (1/10 or less). Tensile forces must be compensated for by a mechanical preload (inside the actuator or external) in order to prevent damage to the ceramics. ![]() nominal displacement without external force or restraint ![]() Maximum force available to accelerate the piezo mass plus any additional mass. ![]() The maximum force is equal to the blocked force described by: Due to the inertia of the Piezo mass (plus any additional mass), a rapid change will generate a force (pushing or pulling) acting on the piezo. Superior lifetime of our actuators is guaranteed with the patented ceramic-encapsulated multilayer production process.Mechanical Considerations for Dynamic Operation of PZTsĮvery time the Piezo drive voltage changes, the piezo element changes its Dimensionss (if not blocked). This group is specialized in research, design and manufacture of piezo materials and components for motion control. We currently employ 180 staff at our piezo ceramics division " PI Ceramic". PI offers the largest selection of standard and custom piezo actuators and engineered subassemblies. They provide efficient force generation because no conversion from rotary to linear motion and no gears or mechanical other parts that require maintenance or lubrication are involved. Piezoelectric actuators (also known as piezo transducers, or piezo translators) are based on the piezoelectric effect and convert electrical energy directly into linear motion with virtually unlimited resolution. ![]()
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