Method and an apparatus for controlling a moving velocity of an

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

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318116, H01L 4108

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active

054612730

ABSTRACT:
A method for controlling a moving velocity of an ultrasonic motor comprising a vibration body for causing ultrasonic vibration in response to two AC driving voltage signals having a common frequency, a common amplitude and phases different from each other; and a moving body in contact with the vibration body and moved by the ultrasonic vibration. The method includes step A of detecting a velocity of the moving body; step B comparing the velocity detected in step A with a predetermined velocity; and step C for adjusting the frequency of the two AC driving voltage signals and the amplitude of or the phase difference between the two AC driving voltage signals, based on the comparison result to allow the velocity of the moving body to be closer to the predetermined velocity.

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Search Report for European Appl. 93120292.3, mailed Mar. 29, 1994.
Aoyagi et al, "Development of Fast and Fine Position Control System of an Ultrasonic Motor," Dec. 1991, pp. 254-256, Jpn. J. Appl. Phys. vol. 31 (1992).

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