Linear inertial piezoelectric motor with bimorph disc

Abstract

Investigation of a novel design tiny piezoelectric inertial motor is given in the paper. Operation principle of the motor is based on inertial motion of the slider applying sticks and slip phases between stator and slider. Piezoelectric motor has simple design and consists of the slider with a bimorph piezoceramic disc and the clamped cylindrical shaft used for sliding. The advantage of the motor design is the self-moving slider that obtains bidirectional inertial motion when the saw tooth or the pulse type excitation signal is applied at resonant frequency. Numerical investigation of the piezoelectric motor based on finite elements method was performed to analyse natural frequencies, modal shapes of the motor and slider response to the different excitation regimes. The influence of the Coulomb friction on the velocity of the slider is analysed. A prototype inertial piezoelectric motor was built, and measurements of electrical and mechanical characteristics were performed. The results of numerical and experimental study are discussed.