Simplified equivalent circuit of an ultrasonic motor and its applications

The present paper deals with a simplified equivalent circuit of an ultrasonic motor and its application to the estimation of motor characteristics for the systematization of research on ultrasonic motors. The equivalent circuit must be simple in order to show the principle of motor operation, so we propose simplified equivalent circuits of one type of ultrasonic motor [1]. As a result, it is made clear that the equivalent circuit proposed is very useful for considering motor characteristics. Moreover, in this paper the improved equivalent circuit of an ultrasonic motor for generating a large torque with a relatively high efficiency is also proposed.