Method for operating a piezoelectric motor, and piezoelectric motor comprising a stator in the form of a hollow cylindrical oscillator

摘要

The invention relates to a method for operating a piezoelectric motor comprising a stator in the form of a hollow cylindrical oscillator having at least one front side which is in frictional contact with a rotor, and standing wave generators. According to the invention, the hollow cylinder is operated in a coupled tangential-axial oscillatory mode, said cylinder comprising predominantly tangential and axial oscillation components. The maximum values of the oscillatory speed of the tangential components are created on the front sides of the hollow cylinder and those of the axial components directly below, the number of components decreasing towards the centre of the height of the cylinder, and a node line being located in the centre of the height of the cylinder, essentially parallel to the front sides, the axial oscillatory components adopting the value zero and the tangential components adopting a minimum value on said node line. In a motor operated in this way, the kinetic drive energy for the rotor is concentrated close to the front sides of the hollow cylinder. A mechanical fixing element for the motor can be arranged in the central part on the zero line of the oscillatory speed components.