| 摘要 |
An ultrasonic motor includes a stator that includes a comb body with a plurality of circumferentially-arranged comb-like projections and a piezoelectric body integrally mounted on the comb body, a rotor rotatable with respect to the stator, the rotor having a contact surface that establishes pressure contact with the stator, and a driving circuit configured to apply a radio frequency voltage for driving the piezoelectric body to the piezoelectric body. The driving circuit includes a voltage generating unit configured to generate a first radio frequency voltage of which a frequency is randomly varied during a predetermined time period after start-up of the ultrasonic motor.
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