| 摘要 |
There is disclosed a driving device for an ultrasonic wave motor, in which a limit detecting circuit (2,3) detects that the drive voltage for the ultrasonic wave motor (100) has reached a limit, and, in response, a drive voltage limiting circuit controls the drive voltage so as not to go beyond the limit value. Such control is conducted on the voltage or frequency of a signal for driving the ultrasonic wave motor. In another aspect of the invention, a drive state detecting circuit detects the drive state of the ultrasonic wave motor (100), and a drive frequency (or voltage) setting circuit (5,4) controls the frequency (or voltage) of a signal for driving the ultrasonic wave motor (100) so as to attain the maximum efficiency in the motor, based on the output of the drive state detecting circuit. <IMAGE> |
