Kinetic Energy Harvesting
Kinetic energy harvesting encompasses diverse technologies that convert mechanical motion into electrical energy, capturing energy that would otherwise be wasted from human activities, machinery, vehicles, and natural movements. The field includes multiple transduction mechanisms: piezoelectric materials that generate voltage when deformed, electromagnetic generators that use moving magnets and coils, electrostatic harvesters that exploit changing capacitance, and triboelectric systems that generate charge through friction. Each approach is optimized for different motion characteristics including frequency, amplitude, and force.
The technology is enabling new classes of self-powered devices, particularly for IoT sensors, wearable electronics, and remote monitoring systems where battery replacement is impractical. Kinetic harvesters in shoes can power fitness trackers, while systems integrated into vehicles can power tire pressure sensors. Larger-scale applications include energy-harvesting floors in high-traffic areas, systems that capture energy from ocean waves, and devices that convert vibrations from machinery into useful power. Companies like Perpetuum, EnOcean, and various startups are commercializing kinetic energy harvesting solutions.
At TRL 6, kinetic energy harvesting is commercially available for specific applications, though power output remains limited compared to battery systems. The technology faces challenges including low power density, the need for consistent motion sources, efficiency optimization across varying conditions, and integration with energy storage systems. However, as power requirements for electronics decrease and the need for maintenance-free systems grows, kinetic harvesting becomes increasingly viable. The technology is particularly valuable for applications where motion is abundant and battery replacement is difficult or impossible, potentially enabling truly autonomous IoT networks and reducing electronic waste from disposable batteries.
