The rotational speed control characteristics of a circular traveling wave motor are investigated. This motor is an ultrasonic motor driven by a specially designed piezoelectric vibrator. There are various parameters for controlling rotational speed due to the influence of friction and resonance between rotor and stator. In this paper the dependence of rotational speed on these parameters is explored by using an experimental instrument. A digital servosystem to control the rotational position of the motor is then assembled, using the experimental results as a guide. The angular resolution of the motor is 5.4′, sufficient as a driver of a standard rotary table.
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Hatsuzawa et al. (1986) studied this question.
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