Ultrasonic motor with an ultrasonic actuator in the form of a hollow partial cylinder

摘要

The motor has an ultrasonic actuator (3) with a piezoelectric element (4) in the form of a partial hollow cylinder having circumferential surfaces, and a symmetric plane running perpendicular to a longitudinal axis of the cylinder. The actuator has two generators (5, 6) for producing ultrasonic waves, and an electrical excitation device electrically excites the generators. A frictional element (7) and/or a frictional layer (8) are arranged at one of the circumferential surfaces of the cylinder. The generators are arranged symmetrical with respect to the symmetrical plane.