204 A Fundamental Study of Dynamic Contact Behavior of Ultrasonic Motor : Effect of Contact Ratio and Maximum Frictional Coefficient on an Ultrasonic Motor

Abstract

We discuss the dynamic complex contact behavior between a stator and a liner that sticks to a rotor of an ultrasonic motor. We already proposed a numerical technique using the Finite Element Method on the basis of incremental theory to analyze the nonlinear behavior for a non-rotating rotor. In this paper, we expand this numerical technique from a non-rotating rotor to a rotating rotor and propose a numerical technique to analyze the dynamic behavior of this complex contact zone. Moreover, we clear the dynamic contact mechanism and the driving characteristics of the ultrasonic motor such as the dependency of driving torque on the maximum frictional coefficient.