Abstract
A new noncontact ultrasonic motor with two flexural standing wave vibration disks has been proposed. The disk rotor sandwiched between two pairs of an air gap and a disk stator is rotated without making contact with stators by the standing wave vibrations of the stators whose temporal phase and spatial position differ. In the experiment, the highest revolution speed has been obtained under combinations of spatial differential angles of +30 and -30°, and temporal phase differences of -110 and +70°. The direction of the rotation could easily be reversed when either the vibration temporal phase or circumferential position of the other stator is made opposite. Moreover, this motor has achieved a high revolution speed in the wide range of gap distances from about 0.5 to 1.2 mm. A revolution speed of about 2000 rpm has been achieved at a very low driving voltage of about 3 V. In the new noncontact ultrasonic motor, the acoustic coupling between both gaps plays an important role.
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