Abstract
AbstractA new actuator for piezoelectric ultrasonic motors (USM) using the d15 effect was conceived. Whereas the piezoelectric d33 and d31 effects are normally used in commercial motors, there exist hardly any USM based on shear actuation. The actuator is a piezoelectric block polarized in axial direction and electroded circumferentially with four electrodes. The suitable superposition of two standing waves generates ultrasonic traveling waves in the actuator, which drives the rotor. The dimensions of the actuator are optimized with respect to the dynamic piezoelectric coupling factor. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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