Torsional actuator and method of manufacturing same

Details Torsional actuator and method of manufacturing same Torsional actuator and method of manufacturing same

1994-09-27

1996-09-03

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310328, 310333, 310367, H01L 4108

Patent

active

055526586

ABSTRACT:
A torsional actuator consisting of multilayers of monolithic piezo-electric ceramic material, with planar electrodes between the successive layers and external contacts for supplying control voltages to the electrodes which cause the actuator to twist about its longitudinal axis by a torsion angle dependent on the control voltages. Viewed in cross-section, and with respect to a reference potential supplied to alternate ones of the electrodes, the remaining electrodes are in four respective quadrants and are supplied with control voltages of polarities dependent on the quadrants in which they are located.

REFERENCES:
patent: Re27116 (1971-04-01), Miller
patent: 4233637 (1980-11-01), Kubota
patent: 4649313 (1987-03-01), Ogawa et al.
patent: 5001382 (1991-03-01), Umeda et al.
patent: 5159266 (1992-10-01), Montgomery
patent: 5182484 (1993-01-01), Culp
patent: 5225731 (1993-07-01), Owen
patent: 5231325 (1993-07-01), Tamai et al.
patent: 5248912 (1993-09-01), Zdeblick et al.
patent: 5281899 (1994-01-01), Culp

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