Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1987-01-09
1988-04-05
Levy, Stewart J.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310317, 73647, H01L 4108
Patent
active
047361301
ABSTRACT:
An ultrasonic frequency generator sets a plurality of parameters for a transducer to enable an ultrasonic operation to meet a plurality of criteria. The generator produces sets of power trains, each formed of a sequence of power bursts of an ultrasound signal having a variable amplitude and a variable frequency. The power bursts are provided with controllable durations and are separated from one another by controllable quiet times. A cavitation density function generator controls the amplitude of the power bursts. The power trains are provided with controlled durations, and variable degas time durations are included between sequences of bursts of the ultrasonic signals. A further function generator is used to control the frequency of the signal, thus providing a swept frequency burst. A controller is provided for setting the center frequency of the swept signal. The generator thus provides a waveform with seven controllable parameters which may be set to conform to any operational criteria.
REFERENCES:
patent: 3371233 (1968-02-01), Cook
patent: 3638087 (1972-01-01), Ratcliff
patent: 4398925 (1983-08-01), Trinh et al.
patent: 4418297 (1982-11-01), Marshall
patent: 4521786 (1985-06-01), Bain
patent: 4559826 (1985-12-01), Nelson
patent: 4562413 (1985-12-01), Mishiro et al.
Arana Louis M.
Levy Stewart J.
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