Vibration wave motor

Details Vibration wave motor Vibration wave motor

1987-12-14

1989-05-23

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310317, 310323, 310328, H01L 4108

Patent

active

048333581

ABSTRACT:
A vibration wave motor for driving a movable member by a travelling vibration wave generated by applying a periodic signal to an electro-mechanical energy transducer element such as an electrostrictive device or piezoelectric device is disclosed. A drive status of the vibration wave motor is detected, a phase difference between the detected signal and the periodic signal applied to the transducer element is detected, a frequency of the periodic signal is selected such that the phase difference is equal to a predetermined constant and the vibration wave motor is driven in a resonance state.

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Abstract for Japanese Patent No. (11) 61-251490.

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