Driving device for ultrasonic motor

Details Driving device for ultrasonic motor Driving device for ultrasonic motor

1994-10-07

1998-06-16

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

318116, H01L 4108

Patent

active

057676097

ABSTRACT:
A driving device for an ultrasonic motor has a limit detecting circuit for detecting that the drive voltage for the ultrasonic motor 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 motor. In another aspect of the invention, a drive state detecting circuit detects the drive state of the ultrasonic motor, and a drive frequency (or voltage) setting circuit controls the frequency (or voltage) of a signal for driving the ultrasonic motor so as to attain the maximum efficiency in the motor, based on the output of the drive state detecting circuit.

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