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This paper deals with constructions of an ultrasonic motor, their characteristics and applications; a paper sheet forwarding device using a flat rectangular type ultrasonic motor is described. Various types of ultrasonic motors can be constructed by considering displacement combinations in the horizontal and vertical directions at the elliptic motion yielded. As for this elliptic motion, multi-mode viorators using degenerate modes of the same or different form are utilized.
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Tomikawa et al. (1989) studied this question.
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