Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
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.
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patent: 5450198 (1995-09-01), Killpatrick et al.
patent: 5557156 (1996-09-01), Elings
Budd Mark O.
New Jersey Institute of Technology
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