| 摘要 |
A stator of an ultrasonic motor includes a piezoelectric element, a plurality of metal blocks, and a fastener. The piezoelectric element is held by the metal blocks The fastener extends through the piezoelectric element and the metal blocks to fasten the piezoelectric element and the metal blocks together. A rotor is pressed against one side of the stator in a contact state. The rotor is rotated in a first direction by generating oscillation at a first resonance frequency in the stator. Further, the rotor is rotated in a second direction opposed to the first direction by generating oscillation at a second resonance frequency, which corresponds to the resonance frequency of the rotor, in the stator. The outer diameter of the fastener is within the range of from 30% to 55% of the outer diameter of the stator.
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