FEM ANALYSIS ON STATOR VIBRATION OF TRAVELING WAVE TYPE CONTACT ULTRASONIC MOTOR

Being a sort of new principle motor, the ultrasonic motor is quite different from the electromagnetic motors, its driving torque isn't acquired by the electromagnetic effect but by the reverse piezoelectric effect of piezoelectric ceramics. Considering the boundary condition and the diametric thickness variation, the toothed stator model of traveling wave type contact ultrasonic motor is built in this paper. The natural frequency and response vibration of the stator are analyzed by use of the Finite Element Method (FEM). The effect of diameter and tooth height on the stator vibration is also discussed. The results are compared with the experiment, the Finite Element Method proved to be effective that can be used to analyze the toothed stator vibration of traveling wave type contact ultrasonic motor which composed of several materials.