This technology is a road-based energy harvesting device consisting of a top plate that moves downward under vehicle load, a coil unit wrapped in wire, a core unit that rotates clockwise or counter-clockwise through a through-hole in the coil unit depending on the load, and a magnet unit in contact with the core. Each rotation of the core induces current in the coil by reversing its magnetization.
The force exerted on road surfaces by moving vehicles is largely wasted energy. While electromagnetic induction harvesting devices have been researched to convert this into electricity, conventional methods involving reciprocating magnets within coils have faced limitations in increasing power generation efficiency, as the coil winding length is constrained by the required displacement of the magnets.
This technology connects the first and second pillars extending downward from the top plate with a cylindrical connector. This connector fits into a ring-shaped coupling at the end of the core, converting vertical motion into rotational motion, while protrusions on the connector's outer surface prevent the core from sliding longitudinally. The magnet unit, composed of four permanent magnets, is arranged so that opposite poles contact both ends of the core during clockwise and counter-clockwise rotation, causing a significant reversal of magnetic flux with each load cycle. Applicable to highway toll booths, entry ramps, intersection stop lines, and speed bumps at parking entrances, it allows for on-site power generation for road lighting or traffic sensors simply through the pressure of passing vehicles.
This invention was developed with support from the Ministry of Trade, Industry and Energy for the development of energy harvesting materials and modules for independent power sources in smart sensors.
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