Broadband hybrid electromagnetic and piezoelectric energy harvesting from ambient vibrations and pneumatic vortices induced by running subway trains.
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2017-05-01
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By Wang, Ya
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Abstract:The airfoil-based electromagnetic energy harvester containing parallel array motion between moving coil and
trajectory matching multi-pole magnets was investigated. The magnets were aligned in an alternatively
magnetized formation of 6 magnets to explore enhanced power density. In particular, the magnet array was
positioned in parallel to the trajectory of the tip coil within its tip deflection span. The finite element
simulations of the magnetic flux density and induced voltages at an open circuit condition were studied to
find the maximum number of alternatively magnetized magnets that was required for the proposed energy
harvester. Experimental results showed that the energy harvester with a pair of 6 alternatively magnetized
linear magnet arrays was able to generate an induced voltage (Vo ) of 20 V, with an open circuit condition,
and 475 mW, under a 30 Ω optimal resistance load operating with the wind speed (U ) at 7 m/ s and a natural
bending frequency of 3.54 Hz.
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