Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1996-08-14
1999-02-02
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310324, 310331, H02H 202, H01L 4108
Patent
active
058669710
ABSTRACT:
A hybrid actuator includes strain actuated elements that displace fluid to move a piston, with the elements forming a fluid housing, and being oriented and actuated to optimize force, stroke or bandwidth. In one preferred embodiment the elements are cylinders enclosing the fluid, with radial and axial components of strain-induced dimensional change adding together to enhance displacement. In another preferred embodiment, piezo bender elements produce large stroke, high bandwidth movements. Strokes of up to fifty percent of actuator length, and bandwidths above 500 Hz are achieved in light weight electrically actuated devices free of external piping or hydraulics. The actuator is readily integrated into a gate valve, sub-woofer, or other driven device.
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"Piezoelectric Pile" by S. Yamashita, pp. 93-95.
Crawley Edward F.
Lazarus Kenneth B.
Russo Farla M.
Saarmaa Erik
Active Control Experts, Inc.
Dougherty Thomas M.
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