Abstract
In this paper, harvesters coupling magnetostrictive and piezoelectric materials are investigated. The energy conversion of quasi-static magnetic field variations into electricity is detailed. Experimental results are exposed for two macroscopic demonstrators based on the rotation of a permanent magnet. These composite/hybrid devices use both piezoelectric and magnetostrictive (amorphous FeSiB ribbon or bulk Terfenol-D) materials. A quasi-static (or ultra-low frequency) harvester is constructed with exploitable output voltage, even in quasi-static mode. Integrated micro-harvesters using sub-micron multilayers of active materials on Si have been built and are currently being characterized.
Highlights
We report investigations on composite structures for energy harvesting under quasi-static conditions
In order to outperform those harvesters, we suggest a new kind of converter based on the coupling of piezoelectric and magnetostrictive materials
The saturated states can be reached in two ways: by a mechanical preload on the magnetostrictive material [9], or by a magnetic field bias
Summary
We report investigations on composite structures for energy harvesting under quasi-static conditions. Many harvesters exploit electromechanical conversion to transform, without contact, mechanical energy into electricity Several kinds of such converters are already in use, but most of them suffer from low output voltage and poor efficiency issues at a low scale (
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