Method for controlling the working frequency of an electro-acous

Details Method for controlling the working frequency of an electro-acous Method for controlling the working frequency of an electro-acous

1988-08-30

1989-11-21

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

318116, H01L 4108

Patent

active

048825255

ABSTRACT:
One periodically determines the frequency of the vibrating element for which the absorbed power through the ultrasonic device is at a minimum and for which its efficiency is maximum. One compares this frequency to a previously measured frequency and modifies of one step of a given amplitude the working frequency of the ultrasonic device after a given number of comparisons having for result a frequency difference greater than a pre-established value have been detected.

REFERENCES:
patent: 3666599 (1972-05-01), Obeda
patent: 3889166 (1975-06-01), Scurlock
patent: 4253036 (1981-02-01), Kizaki
patent: 4525790 (1985-06-01), Nakamura
patent: 4562413 (1985-12-01), Mishiro
patent: 4687962 (1987-08-01), Elbert
patent: 4689515 (1987-08-01), Benndorf et al.
patent: 4703213 (1987-10-01), Gasler
patent: 4736130 (1988-04-01), Puskas

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