Electrical generator or motor structure – Educational or construction units or kits
Patent
1975-01-30
1976-08-17
Budd, Mark O.
Electrical generator or motor structure
Educational or construction units or kits
318116, H01L 4108
Patent
active
039756505
ABSTRACT:
The ultrasonic generator comprises a transducer which is adapted to vibrate in a fundamental frequency mode and the harmonics thereof in response to a square wave signal which is applied thereto. The transducer is of the piezoelectric type which has a capacitor loading effect. A square wave generator is provided for generating a square voltage wave and driving means comprising high speed switching transistors is responsive to the signal from the square wave generator for driving the transducer with a square wave. The transistors are switchable between conducting and non-conducting states and are connected to the square wave generator so that the transistors are switched in phase opposition to each other. A non-resonant inductor connects the pair of transistors with the transducer to limit current flow and to permit application of the square wave to the transducer. An alternate embodiment utilizes a balancing transformer to eliminate the normal high common mode switching current.
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patent: 3371233 (1968-02-01), Cook
patent: 3432691 (1969-03-01), Shoh
patent: 3443130 (1969-05-01), Shoh
patent: 3489930 (1970-01-01), Shoh
patent: 3581125 (1971-05-01), Arndt
patent: 3676720 (1972-07-01), Libby et al.
patent: 3681626 (1972-08-01), Puskas
patent: 3736523 (1973-05-01), Puskas
patent: 3819961 (1974-06-01), Bourgeois et al.
patent: 3842340 (1974-10-01), Brandquist
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