To improve the precision of rapid positioning of a piezoelectric positioning stage
a positioning model is established to characterize the relationship between driving voltage and output displacement of the platform. As the piezoelectric positioning stage for precision position in the fast and large stroke is not only affected by the hysteresis characteristics of the piezoelectric ceramics
but by the dynamic characteristics
this paper uses Bouc-Wen model to describe the hysteresis characteristics of piezoelectric ceramics
combines with the dynamic characteristics of the piezoelectric positioning stage to establish model
and lets the model reflect the dynamic characteristics and hysteresis characteristics of the platform. To verify the correctness of the model
the experimental equipment based on the piezoelectric micro displacement platform and the related driver is built
and model is verified by experiments
and a secondary development of monitor-control program is performed.The results show that
compared with the previous Bouc-Wen model
when proposed model in the maximum displacement output is 40
μ
m and the input voltage frequency is 40 Hz
the maximum error is reduced from 3.04
μ
m to 0.67
μ
m and the maximum relative error is 1.68%.The results show that the proposed model can better simulate the hysteresis characteristics and dynamic characteristics of the piezoelectric stage
and greatly improve the accuracy of the piezoelectric micro displacement platform in the fast and large stroke positioning.
关键词
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references
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