Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1984-06-11
1985-11-12
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310317, 310358, 200181, H01L 4108
Patent
active
045530610
ABSTRACT:
A direct current latching relay comprised of bender-type piezoelectric drive members each of which is a three terminal member formed of two piezoelectric plate elements separated by a conductive plane. Each piezoelectric plate element is separately electrically charged with an input pulsed d.c. switching signal of the same polarity as the pre-poling field previously induced in the piezoelectric plate element. By electrically charging one of the piezoelectric plate elements with a switching signal electric field of the same polarity as the pre-poling field, the bender-type drive members are member made to bend in one direction. Alternatively, by charging the opposite plate of the drive member again with a direct current electric charging field of the same polarity as the pre-poling field previously induced in the plate, the bender-type drive member can be caused to bend in the opposite direction. The bender-type piezoelectric drive member when bent engages and drives a push rod which actuates a snap-action switching contact mechanism from either an open circuit state or to a closed circuit state or vice versa. Pulsed direct current charging fields are applied to the piezoelectric plate element of the bender-type drive member and a high resistance discharge resistor is connected across each of the piezoelectric plate members so as to automatically discharge the plate members shortly after their excitation. As a result, no long term depolarization of the piezoelectric plate members occurs and because of the pulsed short term nature of the charging fields, no long term deformation (creep) develops in the plate elements over extended periods of usage of the relay.
REFERENCES:
patent: 2166763 (1939-07-01), Mason
patent: 2365738 (1944-12-01), Williams
patent: 2387108 (1945-10-01), Arndt, Jr. et al.
patent: 3109901 (1963-11-01), Strauss
patent: 3760203 (1973-09-01), Guntersdorfer
patent: 3794410 (1974-02-01), Elliott
patent: 3840758 (1974-10-01), Zoltan
patent: 4237399 (1980-12-01), Sakamoto
patent: 4403166 (1983-09-01), Tanaka
Budd Mark O.
General Electric Company
Jacob Fred
McDevitt J. F.
Schlamp Philip L.
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