Piezoelectric motor

Details Piezoelectric motor Piezoelectric motor

1987-12-21

1989-10-03

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310330, H01L 4108

Patent

active

048719390

ABSTRACT:
An elongated bilaminate bender is formed from a pair of piezoelectric ceramic sheets laminated to a conductive metallic strip. In response to an alternating current, the bender bends in a direction substantially perpendicular to its long axis, first one way and then the opposite. One end of a pivot bar is driven by the bender. A spring provides a bias force opposite to the direction that the pivot bar is pushed by the bender, to return the pivot bar when the bender bends in the opposite direction. A pair of pawls attached one on either side of the pivot axis of the bar, alternately drive a ratchet wheel on the bender drive stroke and the return stroke. The ratchet wheel turns a drive shaft. A stop prevents the pivot bar from exactly following the motion of the bender, so that the motion of the drive shaft is independent of voltage fluctuations of the alternating current.

REFERENCES:
patent: 3192416 (1965-06-01), Gerber
patent: 3192417 (1965-06-01), Seck et al.
patent: 3297889 (1967-01-01), Breskend
patent: 3302043 (1967-01-01), Berger
patent: 3504206 (1970-03-01), Fritsch
patent: 3596116 (1971-07-01), Walton
patent: 3694681 (1972-09-01), Horstmann et al.
patent: 4056743 (1977-11-01), Clifford et al.

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