Modal Analysis of a Ring Type Linear Ultrasonic Traveling Wave Motor

In this paper the stator of a traveling wave ultrasonic motor for linear motion is investigated. The stator consists of two curved and two straight sections. A modal analysis is done with the help of FEM. As a general example,the influence of the element size on the eigenfrequency calculation and the influence of the piezoceramics elements on the frequencies and mode shapes are given. The experimental results of the prototype stator show,the difference of resonance frequencies of the bending mode does coincide with the corresponding eigenfrequency- difference.