Research On Piezoelectric-Electromagnetic-Triboelectric Hybrid Energy Harvester Based On Rotational Motion

With the development of economy,people’s demand for traditional energy is increasing,and the excessive use of traditional energy also aggravates global warming and environmental pollution.At the same time,due to the progress of science and technology,microelectro mechanical systems(MEMS)has also been developed rapidly in the direction of intelligence and integration,and its power consumption is also constantly reduced.However,at present,electronic devices are mainly powered by chemical batteries,which are not easy to maintain,have limited service life and pollute the environment.Therefore,people pay more and more attention to the development of renewable and sustainable energy.In order to solve the energy problem,as a new and effective way of energy conversion,the conversion of mechanical energy into electrical energy in the environment has attracted extensive attention of researchers.Therefore,in this paper,the common rotating mechanical energy in life is taken as the research object,and in order to achieve more mechanical energy harvesting,the piezoelectric-electromagnetic-triboelectric hybrid energy harvester based on rotating motion is studied.First of all,three kinds of energy harvesting methods,piezoelectric energy harvesting,electromagnetic energy harvesting and triboelectric energy harvesting,are described from the energy harvesting principle.The energy harvesting is realized through the direct piezoelectric effect,Faraday electromagnetic induction and the coupling contact electrification and electrostatic induction.The energy harvesting mechanism of each part of the energy harvester is described in detail by establishing the theoretical model.By using COMSOL multiphysics 5.2 multiphysical simulation software,the simulation analysis of different energy harvesting units in the hybrid energy harvester is carried out.The force of piezoelectric cantilever beam under the force of magnet,the change of magnetic flux in the electromagnetic coil and the potential distribution of triboelectric energy harvesting between triboelectric layers at different separation distances are simulated and analyzed.The feasibility of the energy harvester is verified.Secondly,according to the energy harvesting mechanism and simulation analysis,the design of the hybrid energy harvester model is designed,and the working principle of the hybrid energy harvester is elaborated in detail.The energy harvester captures the rotating mechanical energy generated in the process of rotational movement,and uses the combinedform of piezoelectric,electromagnetic and triboelectric energy harvesting methods to convert the mechanical energy into electrical energy.By using the cylindrical permanent magnets I inside the acrylic cylinder to interact with different energy harvesting methods to achieve hybrid energy harvesting,the energy harvesting efficiency of the energy harvester can be improved.Subsequently,the prototype of the hybrid energy harvester is carried out,and its manufacturing process is elaborated in detail.Finally,an experimental test system of piezoelectric-electromagnetic-triboelectric hybrid energy harvester based on rotating motion is built,and the experimental research on the energy harvesting characteristics of the hybrid energy harvester is carried out.The open-circuit voltage,short-circuit current,transferred charge of triboelectric energy harvesting unit,power load characteristics,durability test and application in practice are tested.The experimental results show that by charging 10 μF commercial capacitors,the energy harvesting capability of piezoelectric-electromagnetic-triboelectric hybrid energy harvester is significantly better than that of single energy harvester,and more energy is harvested.With the help of rectifying circuit and capacitor,the hybrid energy harvester can supply energy for the thermohygrometer as the energy source,which proves that the designed hybrid energy harvester can provide power for low-power electronic devices and meet their normal work.In addition,the triboelectric energy harvester in the hybrid energy harvester can work continuously and stably for 9 hours,which proves that the hybrid energy harvester has good stability and durability.