Ultrasonic vibration motor and method for performing coarse and

Details Ultrasonic vibration motor and method for performing coarse and Ultrasonic vibration motor and method for performing coarse and

1997-06-06

1998-07-21

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310323, H02N 200, H01L 4108

Patent

active

057838992

ABSTRACT:
An ultrasonic motor having a linear elastic body which contacts a relative movement member, piezo-electric elements which are joined to the elastic body, and a first waveform generator which repeatedly generates drive signals that have a first waveform part in which the drive voltage changes slowly on the piezo-electric elements and a second waveform part in which the drive voltage changes rapidly. The ultrasonic motor further has a second waveform generator which produces elliptical movement that is generated by the combined vibrations of longitudinal vibration and flex vibration on the elastic body based on applying sine waves having differing phases to specific locations of the piezo-electric elements and a controller which selectively switches the outputs of the first and second waveform generators.

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Piezoelectric Linear Motors and Application to Driving a Light Pick-Up Element, Y. Tomikawa, M. Aoyagi, T. Ogasawara, A. Yabukl, Tohoku Institute of Technology, Sandai, Jun. 9-11, 1993, all pages.
Ultrasonic Motors Theory and Applications, S. Ueha, Y. Tomikawa, Clarendon Press, Oxford, 1993, all pages.

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