Simplified Equivalent Circuit of Ultrasonic Motor and Its Application to Estimation of Motor Characteristics

This present paper deals with a simplified equivalent circuit of an ultrasonic motor and its application to the estimation of motor characteristics. Investigation of this equivalent circuit is conducted from the viewpoint of systematization of research on ultrasonic motors. The equivalent circuit must show the principle of motor operation and must be expressed simply. In this paper, we propose simplified equivalent circuits of two types of ultrasonic motors which have different combinations of vibrations used. As a result, it has been proven that these equivalent circuits are similar to each other in spite of the difference in the vibrations used. In this paper, moreover, measurement points of an ultrasonic motor for estimation of its characteristics are clarified.