Patent ID: 8183742

Claim:
A piezoelectric motor, comprising: a housing extending along an axis; a first shaft aligned with the axis and rotatably coupled to the housing; a first rotor disposed about the first shaft and configured for rotation about the first shaft; an annular shaped first piezoelement disposed within the first rotor, centered on the axis and fixed to the housing; an annular shaped second piezoelement disposed with the first rotor, centered on the axis and fixed to the first shaft; wherein the first piezoelement is coupled to a plurality of pushers configured to rotate the first rotor at a first forward rate of rotation when the first piezoelement is stimulated with a first exciter voltage, and the second piezoelement is coupled to a plurality of pushers configured to engage the first rotor and rotate the first shaft in a second forward rate of rotation different than the first forward rate of rotation when the second piezoelement is concurrently stimulated with a second exciter voltage.