Modelling and Numerical Simulation of an Ultrasonic Piezo-Motor based on Piezoelectric Properties of Pb(1-x)Srx(Ti0,48Zr0,52)(1-y)NbyO3 Ceramics

Abstract

Firstly, the paper presents a solid solution of piezoelectric ceramic that was synthesized according to the general formula Pb(1-x)Srx(Ti0.48Zr0.52)(1-y)NbyO3 with x = 0.05 and y = 0.02, using wet ceramic processing technology and using oxides as prime materials. The effects of dopants (Sr2+ and Nb5+) on phase constitution, on microstructure and on the dielectric and piezoelectric properties were determined. The Zr4+/Ti4+ ratio was chosen near the morphotropic phase boundary of the lead zirconate titanate (PZT) system in studied composition. The XRD data revealed that the PZT doped composition had tetragonal perovskite structure. Secondly, based on piezoelectric properties of this ceramic, the paper presents the design of the ultrasonic piezo-motor based on a surface wave, which translates the linear extension of different piezoelectric segments of a piezoelectric cylinder into a rotational bending movement. This rotational bending of the piezoelectric cylinder is then transformed into a continuous rotation of the rotor through a calculated contact. A mathematical model and the numerical simulations of ultrasonic piezo-motor is presented. The numerical simulation has been performed in two different cases: an idle-case, where no external opposition torque was applied to the rotor, and a maximum torque case, where the rotor was blocked to calculate the maximum torque that the motor could produce.