Electricity: motive power systems – Nonmagnetic motor
Patent
1991-10-17
1992-08-04
Budd, Mark O.
Electricity: motive power systems
Nonmagnetic motor
310316, 310323, H01L 4108
Patent
active
051362155
ABSTRACT:
A driving circuit for a vibration wave motor uses an AC signal supplied to a piezoelectric member provided on a vibration member to cause a travelling vibration wave in the vibration member, thus driving a movable member. The frequency of the AC signal supplied to the piezoelectric member is determined in a first mode in which the frequency is manually selected, or in a second mode in which a particular resonant frequency is automatically selected according to the vibration state of the motor, wherein the operation is automatically switched from the first mode to the second mode upon detection that the AC signal approaches the particular frequency.
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Budd Mark O.
Canon Kabushiki Kaisha
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