Piezoelectric motor using longitudinal and bending vibration modes

A piezoelectric device comprising:

• a piezoresonator body comprising a contact element;
• wherein the piezoresonator body comprises a longitudinal axis, a transverse axis, a natural resonant frequency (v1) of first-order longitudinal standing vibrations along the transverse axis and a natural resonant frequency (v2) of second-order bending standing vibrations along the longitudinal axis, with v1≠v2;
• and
• a set of electrodes disposed on the piezoresonator body, wherein applying alternating voltage to the set of electrodes excites the first-order longitudinal standing vibrations, which produces parametric excitation of the second-order bending standing vibrations, thereby producing motion of the contact element.

A piezoelectric motor comprising:

• a single moving element;
• and
• a piezoelectric device comprising:
• a piezoresonator body comprising a bulk region and a contact element that makes frictional contact with the moving element;
• wherein the piezoresonator body comprises a longitudinal axis, a transverse axis, a natural resonant frequency (v1) of first-order longitudinal standing vibrations along the transverse axis and a natural resonant frequency (v2) of second-order bending standing vibrations along the longitudinal axis, and v1<v2≤1.1v1;
• and
• a set of electrodes disposed on the piezoresonator body.