Construction of Megatorque Hybrid Transducer Type Ultrasonic Motor

Abstract

A large hybrid transducer type ultrasonic motor has been studied for the purpose of achieving large output torque. The goal of our research is to realize a megatorque (i.e., 1000 kgf·cm) ultrasonic motor. The key to accomplishing this goal lies in obtaining sufficient longitudinal vibration in order to control the frictional force between the rotor and the stator. In this paper, a motor of 120 mm in diameter using the second longitudinal vibration mode is fabricated and investigated, as a preliminary step toward realization of the megatorque ultrasonic motor. As a result of our experiments, the maximum torque of 400 kgf·cm was achieved.