A digital charge amplifier for hysteresis elimination in piezoelectric actuators
Date
2013
Authors
Bazghaleh, M.
Grainger, S.
Mohammadzaheri, M.
Cazzolato, B.
Lu, T.
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Smart Materials and Structures, 2013; 22(7):1-9
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M Bazghaleh, S Grainger, M Mohammadzaheri, B Cazzolato and T-F Lu
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Abstract
Piezoelectric actuators are commonly used for nanopositioning due to their high resolution, low power consumption and wide operating frequency, but they suffer hysteresis, which affects linearity. In this paper, a novel digital charge amplifier is presented. Results show that hysteresis is reduced by 91% compared with a voltage amplifier, but over long operational periods the digital charge amplifier approach suffers displacement drift. A non-linear ARX model with long-term accuracy is used with a data fusion algorithm to remove the drift. Experimental results are presented.
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© 2013 IOP Publishing Ltd