Ultrasonic actuator

The invention relates to an ultrasound actuator, preferably for use in an ultrasonic motor, in the form of a piezoelectric plate with a length L, a height H and a thickness t, wherein the piezoelectric plate has a transverse plane of symmetry Sq, a longitudinal plane of symmetry Sl and at least two having major faces, and said piezoelectric plate comprises at least two symmetrically with respect to the plane of symmetry Sq generators arranged for generating ultrasonic standing waves. According to the invention, the piezoelectric plate an at least eight side faces comprehensive shape, wherein at least two of the side faces are provided for the contacting of elements to be driven work surfaces, and at least two of the side surfaces for holding the piezoelectric plate provided for holding surfaces and the remaining side surfaces are free areas, wherein at least four free surfaces at the same angle α to the longitudinal plane of symmetry Sl and / or at the same angle φ to the transverse plane of symmetry Sq are arranged.