Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1995-08-31
1997-02-25
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
7351434, G01P 1500, H01L 4108
Patent
active
056062141
ABSTRACT:
The present invention is a controllable surface based upon a 1:3 piezoeleic composite (sometimes referred to as a 1-3 composite or a 1/3 composite). The 1:3 piezoelectric composite has a first planar electrode plate, a first plurality of piezoelectric rods fixed to and extending normally from the first planar electrode plate, a second plurality of piezoelectric rods fixed to and extending normally from the first planar electrode plate, and a second planar electrode plate, coupled to the first plurality of piezoelectric rods and decoupled from the second plurality of piezoelectric rods, essentially parallel to and opposing the first planar electrode plate. The first plurality of piezoelectric rods act as actuators, and urge the first planar electrode plate in a direction normal to said plate in response to an actuator signal (applied as a bias between the two planar electrode plates). The second plurality of piezoelectric rods act as accelerometers, and generate an accelerometer signal in response to an accelerating force acting upon the first planar electrode plate. The controllable surface also includes an accelerometer mass, fixed to the second plurality of piezoelectric rods, for providing inertial mass to the second plurality of piezoelectric rods.
REFERENCES:
patent: 3151487 (1964-10-01), Schuck
patent: 3739202 (1973-06-01), Cady
patent: 4683396 (1987-07-01), Takeuchi et al.
patent: 4804875 (1989-02-01), Albert
patent: 4963782 (1990-10-01), Bui et al.
patent: 5334903 (1994-08-01), Smith
patent: 5376859 (1994-12-01), Kim et al.
Dougherty Thomas M.
Karasek John
McDonnell Thomas E.
The United States of America as represented by the Secretary of
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