Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1990-12-05
1994-03-08
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310328, 29 2535, H01L 4108
Patent
active
052930947
ABSTRACT:
A ferroelectric motor comprises a single layer of ferroelectric material electrically excited by an array of electrical contacts and an electrical excitation source for supplying phased electrical signals to the contacts thereby creating a travelling wave of mechanical deformation in the ferroelectric layer and actuating an actuator. In alternative embodiments of the invention, the actuator may be linear or rotary. The motor may be fabricated on a single integrated circuit die, in which case the layer of ferroelectric material may be a thin film of PZT. In other embodiments a motor may comprise two dies which are sandwiched together by wafer to wafer bonding. Portions of a die may be removed to permit a linear actuator to project beyond the die.
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Bart Stephen F.
Brooks Rodney A.
Cross Leslie E.
Flynn Anita M.
Tavrow Lee S.
Budd Mark O.
Massachusetts Institute of Technology
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