| 摘要 |
A driving apparatus for an ultrasonic motor comprises a stator that generates progressive oscillating waves in an elastic body by excitation of a piezoelectric body; a mover that is rendered in contact with said stator by a pressing element so that it is driven by said progressive oscillating waves; a device for producing a signal for steady period, which generates a signal for steady driving; a transient period signal generating device, which generates a driving signal for transient periods; and a switching device which is placed between said ultrasonic motor and said both signal generating devices and which selectively switches the connection between said ultrasonic motor and said two signal generating devices so that said driving signal for transient periods is applied to said ultrasonic motor in said transient state, while said steady driving signal is applied to said ultrasonic motor in said steady operation state. The ultrasonic motor is driven in accordance with said steady driving signal in a steady state, while the ultrasonic motor is driven in accordance with said driving signal for transient periods in a transient state.
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