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Piezo Actuators with Replaceable Tips![]()
Application Idea Feedback Piezo PAS009 Open Loop Actuator, PAZ009 Closed-Loop Actuator, Modular Contact Tips PAA005 PAA013 ![]() Please Wait
Features
These piezo actuators offer a wide selection of travel ranges in a convenient mounting package. Available with or without feedback, both types offer the flexibility of interchangable tips. Piezo Driver Bandwidth TutorialKnowing the rate at which a piezo is capable of changing lengths is essential in many high-speed applications. The bandwidth of a piezo controller and stack can be estimated if the following is known:
To drive the output capacitor, current is needed to charge it and to discharge it. The change in charge, dV/dt, is called the slew rate. The larger the capacitance, the more current needed: For example, if a 100 µm stack with a capacitance of 20 µF is being driven by a BPC Series piezo controller with a maximum current of 0.5 A, the slew rate is given by Hence, for an instantaneous voltage change from 0 V to 75 V, it would take 3 ms for the output voltage to reach 75 V. Note: For these calculations, it is assumed that the absolute maximum bandwidth of the driver is much higher than the bandwidths calculated, and thus, driver bandwidth is not a limiting factor. Also please note that these calculations only apply for open-loop systems. In closed-loop mode, the slow response of the feedback loop puts another limit on the bandwidth. Sinusoidal SignalThe bandwidth of the system usually refers to the system's response to a sinusoidal signal of a given amplitude. For a piezo element driven by a sinusoidal signal of peak amplitude A, peak-to-peak voltage Vpp, and frequency f, we have: A diagram of voltage as a function of time is shown to the right. The maximum slew rate, or voltage change, is reached at t = 2nπ, (n=0, 1, 2,...) at point a in the diagram to the right: From the first equation, above: Thus, For the example above, the maximum full-range (75 V) bandwidth would be
For a smaller piezo stack with 10 times lower capacitance, the results would be 10 times better, or about 1060 Hz. Or, if the peak-to-peak signal is reduced to 7.5 V (10% max amplitude) with the 100 µm stack, again, the result would be 10 times better at about 1060 Hz. Triangle Wave SignalFor a piezo actuator driven by a triangle wave of max voltage Vpeak and minimum voltage of 0, the slew rate is equal to the slope:
Or, since f = 1/T: Square Wave SignalFor a piezo actuator driven by a square wave of maximum voltage Vpeak and minimum voltage 0, the slew rate limits the minimum rise and fall times. In this case, the slew rate is equal to the slope while the signal is rising or falling. If tr is the minimum rise time, then or
For additional information about piezo theory and operation, see the Piezoelectric Tutorials page. Displacement Sensor7 Pin LEMO MalePAZ Series ONLY ![]()
Piezo Drive InputSMC Male
Maximum Input Voltage: 75 V
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The PAS Series of Piezoelectric Actuators offer three travel ranges in a convenient mounting package: 20, 40, and 100 µm. The mounting barrel allows the actuator to be mounted in any standard Ø1/2" (Ø12.7 mm) mounting hole. These actuators can be driven by any of our Piezo Controllers. A PAA001 Flat End tip is included with each actuator. The tip of the actuator is tapped to accept any of our PAA Series Actuator Tips (sold below). ![]()
The PAZ Series of Piezoelectric Actuators are available in two travel ranges, 20 and 40 µm. Each has a convenient mounting barrel diameter that is compatible with any industry standard Ø1/2" (Ø12.7 mm) bushing size. These actuators provide positional feedback via a 7 pin LEMO connector that can be used in conjunction with our APT series of motion controllers. These actuators can be driven by any of our Piezo Controllers. A PAA622 piezo control cable is also included with each actuator. A PAA001 Flat End tip is included with each actuator. The tip of the actuator is tapped to accept any of our PAA Series Actuator Tips (sold below). ![]()
These actuator tips provide additional mechanical interfacing options for the PAS and PAZ series of piezoelectric actuators. These tips are precision machined from durable stainless steel for high accuracy and long life. The PAA001 is a replacement for the flat tip included with each of the above actuators. The PAA005 features a captive ball end and the PAA007 and PAA013 provide an 8-32 or M4 threaded stud, respectively. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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