Driving device for ultrasonic motor

Details Driving device for ultrasonic motor Driving device for ultrasonic motor

1990-10-23

1992-12-22

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310318, 318116, H01L 4108

Patent

active

051736314

ABSTRACT:
In a driving device for an ultrasonic motor which includes a stator for generating a travelling vibration wave in an elastic member by the excitation of a piezoelectric member and a rotor pressed into contact with the stator, the rotor being driven by the travelling vibration wave, a drive signal which drives the motor is supplied to the motor through an induction element. A phase difference between signals input to and output from the induction element is measured, and drive of the ultrasonic motor is controlled using the obtained value.

REFERENCES:
patent: 3975650 (1976-08-01), Payne
patent: 4510411 (1985-09-01), Hakamata et al.
patent: 4853579 (1989-08-01), Kawasaki et al.
patent: 4879528 (1989-11-01), Gotanda
patent: 4926084 (1990-05-01), Furutsu et al.
patent: 4954742 (1990-09-01), Izukawa
patent: 4970656 (1990-11-01), Lo et al.

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