Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1986-12-15
1987-08-18
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310317, 360117, H01L 4108, B01F 1100
Patent
active
046879625
ABSTRACT:
The actual resonant frequency of an ultrasonic horn is tracked actively while the horn is operating in a working environment, such as in a clinical analyzer where the horn is partly immersed in a liquid bath in which a series of liquid-filled cuvettes are passed near the horn to dissolve solid tablets in the cuvettes. The horn is driven initially by a signal of fixed amplitude but at a frequency which is varied between set limits about a nominal resonant frequency. Ultrasonic vibration waves of the horn are sensed and fed back for rectification and peak detection over the scan operation. The peak feed back level is held and a second scan is initiated with the drive signal at the same fixed amplitude. When the rectified feedback signal level substantially attains that of the held peak level, a comparison is determined and control logic acts to lock on the frequency at which the comparison was established for a given operating time period.
REFERENCES:
patent: 3819961 (1974-06-01), Bourgeois et al.
patent: 3889166 (1975-06-01), Scurlock
patent: 4562413 (1985-12-01), Mishiro et al.
patent: 4626728 (1986-12-01), Flachenecker et al.
Baxter Travenol Laboratories Inc.
Budd Mark O.
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