Patent ID: 7795782
Filing Date: 2010-09-14
Classification: H02N

Abstract:
1. A miniaturizable motor with a rotor which is driven by a hollow cylindrical piezo oscillator, with the rotor being effectively connected with a face-side friction surface of the piezo oscillator and with a main electrode or counter electrode as well as excitation electrodes being arranged at the surface of the hollow cylinder, characterised in that the hollow cylindrical piezo oscillator consists of a monocrystalline material with a trigonal crystal system which has three electrical main axes arranged at an angle of 120° to each other and one optical axis which includes an angle of 90° with the plane defined by the electrical axes and which coincides with the longitudinal axis of the hollow cylindrical piezo oscillator, and further that the axial axes of symmetry of the respective excitation electrode intersects with one of the three electrical main axes, with the respective axial axis of symmetry extending parallel to the optical axis.