In this paper, we propose a new structure of a coiled stator ultrasound motor (CS-USM) and a driving method for CS-USM. CS-USM is a traveling-wave-type ultrasound motor. Owing to its simple structure, CS-USM can be smaller than the other types of ultrasound motors. However, conventional CS-USM has a problem of low efficiency. Therefore, in order to improve the performance of CS-USM, we have experimentally confirmed the driving principle of CS-USM having a closed-loop-type acoustic waveguide. The improvement of torque and revolution speed was confirmed.
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Abe et al. (2014) studied this question.
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