Vibration motors

A vibration motor including a stator and a rotor and excitation means for deforming said stator in vibratory modes combining tangential vibrations and normal vibrations intended to drive rotation of said rotor, said normal vibrations and said tangential vibrations having at least similar resonant frequencies and even a same resonant frequency, and corresponding substantially to an excitation frequency, a frame having at least two pairs of stator plates including tangential deformation active components, as well as two rotor disks which lie between said stator plates of both pairs, piezo-electric active components for generating a normal force which lie between said stator plates of both of the pairs, spring means being disposed between said pairs of plates and said frame, said piezo-electric active components for generating a normal force are excited so that masses on respective opposite sides of a same rotor disk are in antiphase and the masses on respective opposite sides of said active piezo-electric components are also in antiphase, said piezo-electric active components complying with prestressing conditions.

A vibration motor for moving an aerodynamic control surface of an aircraft, said vibration motor comprising:

• a stator and a rotor and excitation means for deforming said stator in vibratory modes combining tangential vibrations and normal vibrations intended to drive rotation of said rotor, said normal vibrations and said tangential vibrations having at least similar resonant frequencies and even a same resonant frequency, and corresponding substantially to an excitation frequency.