Drive control device for an ultrasonic motor

Details Drive control device for an ultrasonic motor Drive control device for an ultrasonic motor

1994-12-27

1996-10-08

Budd, Mark O.

Electricity: motive power systems

Nonmagnetic motor

310316, H01L 4108

Patent

active

055634788

ABSTRACT:
Based upon the output signals from two detector electrodes provided in positions which differ from those of input electrodes on a piezoelectric transducer element, it is detected in what order resonance frequency band the drive frequency of an ultrasonic motor is included, and the drive frequency of the ultrasonic motor is controlled so as to be within a predetermined frequency band.
Further, the resonance frequency band for the ultrasonic motor is switched over to any one of several resonance frequency bands, and, based upon the output signals from the two detector electrodes provided on the piezoelectric transducer element, it is detected in what order resonance frequency band the drive frequency is included, and the drive frequency of the ultrasonic motor is controlled so as to be within the resonance frequency band which has been switched over to.

REFERENCES:
patent: Re34409 (1993-10-01), Hakamata et al.
patent: 4658172 (1987-04-01), Izukawa
patent: 4692649 (1987-09-01), Izukawa et al.
patent: 4794294 (1988-12-01), Shimizu et al.
patent: 4954742 (1990-09-01), Izukawa
patent: 5001404 (1991-03-01), Kataoka
patent: 5162708 (1992-11-01), Naito et al.
patent: 5247221 (1993-09-01), Atsuta

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