A linear ultrasonic motor using (K0.5Na0.5)NbO3 based lead-free piezoelectric ceramics

A linear ultrasonic motor using lead-free piezoelectric ceramics equipped with quadrate plate transducers has been developed. Four lead free piezoelectric plates driving elements formed a multi-driving-end, producing a large thrust and output velocity. The design of the stator enables two operating modes with coincident frequency. A microscopic view suggests that the material particles at the top of four projections move in ellipses and drive the slider alternately via frictional forces to realize linear motion. The fabrication and characterization of the lead-free piezoelectric ceramics achieving the drive of stator were given in the context.