A piezoelectric motor assembly for producing rotary motion, according to the present invention, has a motor frame and a circular body rotatably mounted on the motor frame having a diameter, a thickness, and a circumferential outer surface. At least two piezoelectric motors are mounted on the motor frame in tangential engagement with the outer surface of the circular body. The at least two piezoelectric motors are biased against the outer surface, resulting in an unbalanced net force on the circular body.
