Driving device and method for ultrasonic wave motor

Details Driving device and method for ultrasonic wave motor Driving device and method for ultrasonic wave motor

1996-06-27

1999-12-21

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310317, 318116, H01L 4108

Patent

active

060053283

ABSTRACT:
A driving device for an ultrasonic wave motor, comprises: a stator member having an electrostrictive member and a resilient member, and adapted to generate travelling vibration wave in the resilient member by excitation with the electrostrictive member; a moving member maintained in pressure contact with the stator member and driven by the travelling vibration wave; a reference pulse oscillator circuit for generating reference pulses of a frequency determined corresponding to a required moving speed of the member; an encoder for generating pulses relating to the amount of movement of the moving member; a phase difference signal generating circuit for generating a phase difference signal corresponding to the phase difference between the reference pulses from the reference pulse oscillator circuit and the output pulses of the encoder; and an AC voltage forming circuit for forming AC voltage signals to be supplied to the electrostrictive member, based on the phase difference signal.

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