Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-10-23
2000-03-14
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310328, 310366, H01L 4108
Patent
active
060377062
ABSTRACT:
A piezoelectric transformer is described that features high energy-conversion efficiency and high reliability. Four driver piezoelectric ceramic plates are provided on the upper and lower surfaces at both ends of a generator piezoelectric ceramic plate having a rectangular shape, the driver piezoelectric ceramic plates having the same width and one-third the length of the generator piezoelectric ceramic plate. Vibration is not hindered and the energy-conversion efficiency is therefore increased in this construction because the draw-out positions of the four input electrodes and three output electrodes are all positioned at the nodes of mechanical vibration. In addition, the reliability of lead wire connections is improved because vibration places no load on the lead wires. Finally, input capacitance and step-up capabilities can be raised by adopting a multilayer construction for the driver piezoelectric ceramic plates.
REFERENCES:
patent: 5365141 (1994-11-01), Kawai et al.
patent: 5757106 (1998-05-01), Sato et al.
patent: 5892318 (1999-04-01), Dai et al.
Inoi Takayuki
Saito Susumu
Budd Mark O.
NEC Corporation
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