Patent ID: 7218031

Claim:
A method for operating a piezoelectric motor having a stator in a form of a hollow-cylindrical oscillator, at least one front side of which has frictional contact with a rotor and which includes standing wave generators, the method comprising: setting the hollow cylinder into a coupled tangential-axial oscillation mode so that tangential and axial oscillatory speed components of the standing wave thus formed in the oscillator or, respectively, points of the cylinder have a same phase or a phase difference of 180°; forming oscillatory speed maximums of the tangential component on the front sides of the hollow cylinder and those of an axial component underneath thereof, wherein, towards a center of the cylinder height, parallel to the front sides of the cylinder, a nodal line is formed on which the axial oscillatory speed component adopts the value zero and the tangential component adopts a minimum, and wherein further axially extending nodal lines are formed in the hollow-cylindrical body in dependence on the mode order on which the axial or tangential oscillatory speed components adopt zero values.