High accuracy piezoelectric positioning device

Details High accuracy piezoelectric positioning device High accuracy piezoelectric positioning device

1995-09-21

1997-11-11

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310316, 310328, 310358, 356350, H01L 4108

Patent

active

056867778

ABSTRACT:
An apparatus and method for utilizing piezoelectric devices for precise positioning purposes without having to endure the detrimental effects of hysteresis. The apparatus and method involving driving a pair of piezoelectric stacks with complementary low amplitude, high frequency dither signals produced by an oscillating source. The complementary low amplitude, high frequency dither arrangement, referred to as an intermediate dither, is self-compensating so that no residual dither is transmitted to a load attached to one of the stacks. Furthermore, the dithering of each stack results in a virtual elimination of hysteresis in the material of the piezoelectric stacks.

REFERENCES:
patent: 3684904 (1972-08-01), Galutva et al.
patent: 4240003 (1980-12-01), Larson, III
patent: 4384230 (1983-05-01), Wisner
patent: 4454441 (1984-06-01), Taniguchi
patent: 4641052 (1987-02-01), Kobayashi
patent: 4653919 (1987-03-01), Stjen et al.
patent: 5450198 (1995-09-01), Killpatrick et al.
patent: 5557156 (1996-09-01), Elings

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