Ultrasonic motor driver

Details Ultrasonic motor driver Ultrasonic motor driver

1992-02-26

1993-03-09

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310317, 310323, 318116, H01L 4108

Patent

active

051928892

ABSTRACT:
An ultrasonic motor driver includes a voltage-current phase difference detector for detecting a phase difference between an applied voltage and a current of a torsional vibration piezoelectric element and a phase shifter for adjusting phases of voltages applied to the longitudinal and torsional vibration piezoelectric elements so that the phase difference is minimum. Even if changes in application environment, e.g., an external force or temperature, occur, a rotational speed can be kept stable to drive an ultrasonic motor.

REFERENCES:
patent: 4713571 (1987-12-01), Suzuki et al.
patent: 4749896 (1988-06-01), Suzuki et al.
patent: 4794294 (1988-12-01), Shimizu et al.
patent: 4833358 (1989-05-01), Suzuki et al.
patent: 4888514 (1989-12-01), Takahashi et al.
patent: 4926084 (1990-05-01), Furutsu et al.
patent: 5021700 (1991-06-01), Takahashi et al.

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