Driving Characteristics of Traveling Wave Ultrasonic Motor: Effect of Rotor Vibration

Abstract The rotor of a traveling wave ultrasonic motor was treated just only as a rigid or flexible body until now. However we examine the effects of the rotor vibration on the driving characteristics of the motor, under the assumption that the bending vibration of the rotor is induced by the stator vibration. Consequently, it is clarified theoretically that the rotor vibration produces six contact patterns between the rotor and the stator. Furthermore the experiments confirm the main theoretical results.