Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1990-09-17
1991-10-08
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310339, H01L 4108
Patent
active
050557335
ABSTRACT:
A method for converting micromotions into macromotions by providing a plurality of piezoelectric members (82) having surface areas sufficient to change the volume of the piezoelectric members (82) macroscopically when their lengths are changed microscopically. The members (82) are located in a sealed chamber (30) filled with an incompressible dielectric liquid (31). When the piezoelectric members are increased in their volume under the effect of an electric current, this variation of volume is transmitted through the incompressible liquid (31) to a small-diameter piston rod (46) which is made integrally with a piston head (34) of a substantially greater diameter. The piston head (34) is located in a hydraulic cylinder of a hydraulic multiplicator which transmits the pressure developed in a chamber (28) of the hydraulic multiplicator to a piston (76). This piston is connected to a working tool, so that when the piezoelectric members (82) increase in their lengths microscopically, this microscopic increase in length is converted into a macroscopic increase in volume of the piezoelectric members which via the incompressible liquid (31) displace piston rod (46) for a substantial length which is further increased by the hydraulic amplifier and is transmitted to the working tool. An apparatus for carrying out the above-described method is made in the form of a hermetically sealed housing (22) divided into a first chamber (28) and a second chamber (30). The second chamber is filled with the incompressible liquid and contains the above-mentioned piezoelectric members (82), while the first chamber (28) forms a part of the above-mentioned hydraulic amplifier.
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Budd Mark O.
Dougherty Thomas M.
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