FEM analysis and Experimental verification the step out of a bending wave vibration type ultrasonic motor, and a torque free phenomenon

There is existence of four abnormal phenomena ((1) step-out phenomenon, (2) torque free phenomenon, (3) reversal phenomenon, (4) abnormal sound noise), proposed here in addition to the problem of a price and mass-production as a factor which obstructs utilization of an ultrasonic motor. If these abnormal phenomena are solvable, it is expectable also as a servo actuator besides the electronic autoparts of a car. Furthermore, I think that a wide range of applicable fields open. This paper is based on the joint research of ISEN (France) and the navy (France), and our university (KAIT). "ATILA^reg" which is analysis simulation software, such as a piezo-electric element, was used in this case. Analysis of excitation and the action of a piezo-electric element and oscillating analysis of the bending wave traveling wave type ultrasonic motor were conducted. And operation characteristics and an oscillation characteristic were simulated. Thus, a cause investigation of an abnormal phenomenon ((1) step-out phenomenon, (2) torque free phenomenon) is tried.