MODELING OF TRIBOELECTRIC VIBRATION ENERGY HARVESTER UNDER ROTATIONAL MAGNETIC EXCITATION

A triboelectric vibration energy harvester under rotational magnetic excitation for wind energy harvesting applications is developed. The triboelectric beam generates electricity using the magnetic impact-induced vibration. The triboelectric energy harvester consists of a clamped-clamped (CC) beam embedded in an outer case. The lower side of the CC-beam acts as an upper electrode that will undergo a contact-separation motion with another lower electrode with a bonded Polydimethylsiloxane (PDMS) insulator. A permanent magnet will be attached to the CC-beam's upper side and will face another magnet attached to a rotation rigid shaft blade at the same polarity. While the fan rotates, a repulsive magnetic force will be created between the two magnets that will excite the CC-beam, lead to the contact-separation motion, and generation of electricity. A single degree of freedom model is presented and simulated to extract the dynamic behavior and the generated electrical signal. The relationship between the output voltage and excitation rotational frequency is analyzed. The relationship between the output voltage and the distance between magnets and its effect on the bandwidth is also discussed. The effect of the surface charge density on the generated output voltage signal is examined. The rotational wind triboelectric energy harvester can effectively scavenge wind energy.