Abstract
We observe the elliptical motion generated by an annular stator of an ultrasonic motor using a high speed microscope. This observation clarifies the behavior to generate a torque of the ultrasonic motor. In this report, we show the generation of the elliptical motion by the high speed microscope. Using the setup, the amplitude of the elliptical motion and the motor power are examined by changing the voltage amplitude and frequency. The vibration amplitude of the elliptical motion is compared with the motor characteristics such as revolution and torque. The result indicates the optimal vibration amplitude to obtain the high torque.
