Nonlinear dual action piezoelectric energy harvester for collecting wind energy from the environment

Abstract

This paper studies a nonlinear dual-action piezoelectric energy harvester for collecting wind energy from the environment. The components of the device are fan blade, rotating shaft, rotator, rotating body, piezoelectric cantilever beam, exciting magnet, mass magnet. Under the excitation of wind energy in the environment, the rotating shaft rotates, the magnetic force and the strike force act on the piezoelectric cantilever beam respectively. According to the piezoelectric effect, the piezoelectric cantilever beam is deformed to produce electric energy. Through theoretical analysis, the formulas of magnetic motion, bending moment, elastic strain, and moment of inertia are obtained. In this experiment, some discussions are made to make it clear whether the magnetic pole of the exciting magnet is the same as the magnetic pole of the mass magnet, the number of exciting magnets, and the distance between the exciting and the mass magnet to ensure the best performance parameters are obtained. The experimental results show that when the working voltage of the blower is 150 V, the exciting magnet and the mass magnet attract each other, the number of exciting magnets is 1, and the distance between the exciting magnet and the mass magnet is 5 mm, the output voltage of the device is the highest and the output voltage is 56 V. If the external resistance is 1500 Ω, the device realizes the maximum output of power. Therefore, small windmills have the potential to collect wind energy as generators and can be widely developed and applied in urban areas.