Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1993-12-15
1995-10-24
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
318116, H01L 4108
Patent
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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Kawasaki Osamu
Nishikura Takahiro
Nojima Takashi
Ohtsuchi Tetsuro
Sumhara Masanori
Budd Mark O.
Matsushita Electric - Industrial Co., Ltd.
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