Research And Application Of Rotary-based Triboelectric-Electromagnetic Hybird Powergeneration Device

The rapid rise of Internet of Things(IoT)technology and microelectronics technology has led to the development of various sensors into the era of integration,miniaturization and ultra-low power consumption.How to provide a green and sustainable energy supply for various sensor devices has become an urgent problem.Triboelectric nanogenerators have attracted a lot of attention from researchers because of their low cost and simple structure.Existing triboelectric power generation devices are mostly suitable for energy acquisition under low frequency conditions and suffer from low power,insufficient friction contact,and short power generation lifetime.In response to the above problems,two rotating triboelectric-electromagnetic composite power generation devices are designed.The research content of this paper is as follows:(1)An arch-shaped thin-film triboelectric unit(TENG1)and a brush-type triboelectric unit(TENG2)are designed to address the problems of inadequate contact and severe wear by rigid friction that occur in conventional flexible friction for triboelectric nanogeneration.Both triboelectric units belong to the triboelectric nanogenerator in the independent layer mode,and the underlying theoretical model of the independent layer mode is analyzed.COMSOL software is used to investigate the potential distribution during the power generation of the two triboelectric generation units,to elaborate the flow direction of the current,and to determine the wiring of the electrodes under multiple electrodes.The two triboelectric generation units are optimized in the constructed test system.The optimized arch friction unit can output the maximum power of 0.55 mW at 400 rpm speed with the impedance matching condition of 5 MΩ.The optimized brush friction unit can output 0.88 mW maximum power at 400 rpm speed with 8 MΩ external load condition.At the same speed,the output power of the latter increased by 60%.The two triboelectric generation units were subjected to durability tests,and after 80,000 cycles,the maximum open-circuit voltage of the arch triboelectric unit decreased by 7.9%and the maximum open-circuit voltage of the brush type triboelectric unit decreased by 5.6%,proving that both rotating triboelectric units have a long generation life.(2)To address the problem of low power of a single triboelectric power generation unit,an electromagnetic power generation unit(EMG)is added.The principle of electromagnetic power generation and the material selection of permanent magnets are explained,and the designed EMG unit is simulated and analyzed by using COMSOL software to determine the arrangement of adjacent permanent magnets and to investigate the relationship between magnetic induction strength and distance of permanent magnets.The output performance of the electromagnetic power generation unit is tested,and the maximum power output of 15.5 mW is achieved at a speed of 400 rpm with an external load condition of 360 Q.It is proved that electromagnetic generation can increase the output power of the unit at the same speed condition.(3)To address the problem of narrow operating frequency range of friction power generation devices,two triboelectric units are combined with electromagnetic power generation units to form two kinds of composite power generation devices.To design the electrical energy conversion circuit,conduct capacitor charging test and drive LED lamp test.It is demonstrated that the two designed composite power generators can maintain good output performance at a wide frequency speed.To demonstrate the practicality of the devices,the two rotating triboelectric-electromagnetic hybird power generators were applied to wind energy harvesting.Both devices can collect wind energy at a wide range of wind speeds from 3 m/s to 14 m/s.At a wind speed of 5.6 m/s,the combined TENG1 and EMG device rotates at about 210 rpm and successfully supplies power to the anemometer after 35 s.The combined TENG2 and EMG device rotates at about 225 rpm and successfully supplies power to the anemometer after 21 s.The start-up efficiency is increased by 50%.The efficiency is increased by 50%.In summary,both of the two hybird power generation devices can achieve wind energy harvesting and wind speed selfsensing power supply,and the latter is more efficient and has certain application value.