Parallel Pre-stressed Piezo Actuators
Parallel pre-stressed piezo actuators (PPA) are preloaded low voltage piezoelectric actuators using a direct-acting multilayer ceramic stack (MLA).
Most conventional Direct Piezo Actuators use an MLA preloaded by Belville washers on the end of the stack, enclosed in a rigid case. The PPA design, however, obtains its preload (or pre-stress) from an external spring frame made of stainless steel which protects the MLA against tensile force and provides convenient mechanical interfaces for the user. The PPA is lighter and more compact than competing designs, making mechanical integration easier. The pre-stressing frame applies an optimal preload force to the MLA stack which ensures a longer lifetime, lower noise and significantly improved dynamic performance.
Three series (M, L, XL) of PPAs are available in order to meet the different needs in terms of stroke, force and dimensions.
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