Coating surrounding a piezoelectric solid state motor stack

Details Coating surrounding a piezoelectric solid state motor stack Coating surrounding a piezoelectric solid state motor stack

1990-09-28

1992-09-15

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310340, 310345, H01L 4108

Patent

active

051480778

ABSTRACT:
An encapsulated piezoelectric solid state motor stack having a plurality of piezoelectric disks interleaved with a plurality of electrodes. A first elastomer is used for encapsulating the stack to prevent arc-over. A second elastomer is used for encasing the combination of the encapsulating elastomer and the stack. An elastomer grease is sandwiched between the encapsulating elastomer and the encasing elastomer for reducing friction between the combination and the encasing elastomer. The friction is induced by an axial displacement produced between first and second end surfaces of the stack when the electrodes are biased by a source of electrical potential. The structure also includes a protective housing including and a diaphragm. The housing cylindrically encases the combination of the stack, the encapsulating elastomer, the elastomer grease and the encasing elastomer, and the and one end thereof. The diaphragm is attached to the housing for encasing the other end of the combination.

REFERENCES:
patent: 3501099 (1970-03-01), Benson
patent: 3683211 (1972-08-01), Perlman et al.
patent: 4011474 (1977-03-01), O'Neill
patent: 4038570 (1977-07-01), Durley, III
patent: 4051396 (1977-09-01), Berlincourt
patent: 4193009 (1980-03-01), Durley, III
patent: 4231287 (1980-11-01), Smiley
patent: 4382243 (1983-05-01), Babitzka et al.
"Large Size Metal Case Type Piezoelectric Actuator", NEC Technical Report vol. 11, No. 4, 1989, pp. 49-53.
Piezoelectric Materials (Physics International Company. Date Unknown).

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