Patent ID: 6979934

Claim:
A piezoelectric drive, especially a piezoelectric motor for producing continuous or stepwise movements, comprising a rotor provided with a friction surface, a drive element in the form of a piezoelectric exciter that can be brought into contact with this surface, the exciter comprising a monolithic, plate-like, piezoelectric transducer provided with substantially rectangular electrode faces, an outer fastening, a friction element disposed on one of the end faces of the piezoelectric transducer, as well as a holding device for the piezoelectric transducer and means for pressing the friction element elastically against the friction surface, characterized in that an elastic double frame enclosing the transducer and having inner and outer frames is disposed at each outer node of the bending oscillation mode for the purpose of holding the piezoelectric transducer and for producing the pressing force of the friction element, the inner frame being joined to each of the longitudinal narrow sides of the transducer and the outer frame to the outer fastening, and furthermore the outer frame and inner frame being spaced apart and maintained in contact via stays or bridges.