Stewart, M; Weaver, P; Cain, M G (2012) Charge redistribution in piezoelectric energy harvesters. Appl. Phys. Lett., 100 (7). 073901

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Abstract

Energy harvesting piezoelectric cantilevers provide a simple, compact low cost construction method for energy harvesting from vibrational sources. Beam theory predicts a linear distribution of strain along the length of the beam, but the conversion of this strain to electrical energy is dependent on the coverage of the beam with active material. In this paper we demonstrate how re-distribution of charge within the piezoelectric leads to losses that can be as high as 25% of the potential generated power. Reducing the area coverage of the piezoelectric is shown to significantly improve cantilever power output, with the optimum coverage being 2/3rds.

Item Type:	Article
Keywords:	energy harvesting
Subjects:	Advanced Materials Advanced Materials > Functional Materials
Identification number/DOI:	10.1063/1.3685701
Last Modified:	02 Feb 2018 13:14
URI:	http://eprintspublications.npl.co.uk/id/eprint/5361

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