Driving method for ultrasonic motor and apparatus using the...

Details Driving method for ultrasonic motor and apparatus using the... Driving method for ultrasonic motor and apparatus using the...

2006-06-14

2008-11-11

Budd, Mark (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

07449814

ABSTRACT:
A method for driving an ultrasonic motor includes the step of applying a driving alternating signal to an ultrasonic vibrator to simultaneously generate two different vibration modes in the ultrasonic vibrator to cause a substantially elliptical vibration at friction-contact members of the ultrasonic vibrator, thus relatively moving the ultrasonic vibrator and a driven body in contact with the ultrasonic vibrator. A preliminary vibration domain in which a preliminary vibration smaller than the substantially elliptical vibration is generated at the friction-contact members is provided prior to a main vibration domain in which the driving alternating signal is applied.

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patent: 6084335 (2000-07-01), Tamai
patent: 6717329 (2004-04-01), Yoshida et al.
patent: 6727635 (2004-04-01), Okamoto et al.
patent: 07-131986 (1995-05-01), None

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