Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1987-12-08
1989-01-31
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310319, 310321, 310338, H01L 4108
Patent
active
048018376
ABSTRACT:
An oscillator employs a single flat piezo-electric transducer as a frequency determining element. The transducer has first, second and third mutually orthagonal axes. The first and second axes lie in a selected one of first and second planes. The first plane is the plane of the transducer, the second plane is at right angles to the first plane. The third axis is perpendicular to the selected plane. The transducer has different modes of excitation in different planes which have different resonant frequencies. The oscillator has a positive feedback loop containing in series a high pass filter and a low pass filter which together [a] determine one selected mode of excitation of the transducer in the selected plane with an associated resonant frequency whereby the transducer resonates in the selected plane at the associated resonant frequency and [b] also prevent the transducer from being excited along the third axis. The transducer yields thereacross an oscillatory voltage having a predetermined maximum peak to peak voltage value in the absence to any load exerted upon the transducer. When a load directed along the third axis is applied to the transducer, the voltage value increases as the magnitude of the load decreases and decreases as the magnitude of the load increases.
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