Research Of Based On Fan Structure And PVDF Cantilever Beam Wind Harvesting

Wind energy is a green energy and exists widely in nature. Piezoelectric vibration energy harvesting method has become the focus of energy harvesting field, for the merit of high electro-mechanical conversion factor, clean and green, and easy miniaturization. It is a hot topic to harvest wind energy using piezoelectric materials, and the energy harvested can be used to power wireless sensor network and low power sonsumption.In this paper a simple wind harvester is proposed based on piezoelectric material PVDF. Implement wind-mechanical-electrical energy conversion. Finally complete the wind energy collection. First, simulate the static characteristics of rectangle, trapezoid, triangle PVDF piezoelectric cantilever beam by ANSYS, the results showed that the triangle piezoelectric cantilever beam has the best output voltage characteristics. Then simulate the size characteristic of triangle piezoelectric cantilever beam, the optimal size is,20mm x60mm (basexheight), the thickness of base material-phosphor bronze is0.1mm, the thickness of PVDF is0.05μm. Again, Simulated the relationship between output power and resistance. The maximum power is94.7μW, the matching resistance is300kΩ. Finally, studied the relationship between fan blades, overlap distance L, wind speed, impedance and output voltage/power by experiments. The results showed that, the diameter of fan is12cm, the blades of fan are7, the overlap is3-8mm, when the wind speed is5-10m/s, the output voltage and power is23.7V and41μW, the matching resistance is430kΩ. The maximum output power density is close to2mW/cm3.