Patent ID: 6952071

Claim:
A piezo-electric drive comprising a stator and a rotor, in which the stator has a cylindrical piezo-element that has at least two electrodes and at least one contact surface and a first resonant frequency, the rotor having a mechanical transfer element between the piezo-element and the rotor, which transfer element has elevations that point at a particular angle into the direction of the contact surface of the piezo-element and under pretension are adjacent to the contact surface and that have a second resonant frequency, and said piezo-element being capable of stimulating vibration of the second resonant frequency in the elevations by periodic exertion of pressure on the elevations, whereby the elevations periodically lift-off from the contact surface and the rotor is set into rotation, the transfer element and the rotor being in the form of an equilateral triangle, a one of the elevations being centered in each triangle side and pointing inwards toward the piezo-element.