Ultrasonic wave motor device and electronic apparatus having ult

Details Ultrasonic wave motor device and electronic apparatus having ult Ultrasonic wave motor device and electronic apparatus having ult

1998-05-07

2000-05-16

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H02N 214

Patent

active

06064138&

ABSTRACT:
An ultrasonic wave motor device comprises an oscillating body having a piezo-electric element and a driving circuit for applying an exciting signal to the piezo-electric element to oscillate the oscillating body in self-excited oscillation. The driving circuit has an amplifying circuit for amplifying the exciting signal and a phase setting circuit for setting a phase of the exciting signal amplified by the amplifying circuit. A measuring device measures a characteristic of the driving circuit or a characteristic of the oscillating body. A phase adjusting circuit corrects a shift of the phase of the exciting signal in accordance with a measurement by the measuring device.

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