Theoretical Research On Nanogenerators For Micro/Nano Energy Harvesting

With the remarkable development of micro-nano manufacturing technology,electronic products have entered the intelligent era of miniaturization,integration,and multi-function.Therefore,the wide application of wearable electronic devices makes the energy harvesting device as its energy supply unit an indispensable and important research part.Among them,as an important branch of energy harvesting devices,nanogenerators still have problems such as the narrow scope of application,imperfect theoretical research,and insufficient output power.To this end,this thesis conducts modeling analysis and theoretical research on triboelectric and electromagnetic inductive generations respectively and verifies the validity of the proposed model through measurements.By designing the structure and improving the mechanism,different power generation technologies are integrated into a whole,and an effective solution is provided for the application of micro-nano energy harvesting.Complementing the advantages of the high voltage of triboelectric nanogenerator and the high current of the electromagnetic inductive generator can effectively improve the output of the energy supply unit,thereby broadening the application range and future scenarios of micro-nano energy harvesting.In view of the above issues,this thesis’ s study focuses on three major areas:Firstly,a definite solution problem model based on Poisson’s equation is proposed,which unifies the electromagnetic field equations describing the triboelectric nanogenerator into a theoretical framework.At the same time,the electrical output and multi-parameter characteristics of the triboelectric nanogenerator are analyzed in detail,and the theoretical predictions are verified by experimental tests.In addition,the analysis of the load characteristics revealed that the triboelectric nanogenerator has the characteristics of a current source.Secondly,a practical electromagnetic model is established for the transverse electromagnetic inductive generator,and the influence of factors such as magnet shape,number of coils,cavity structure and layout,and number of turns on the output waveform and peak value is analyzed.In order to facilitate the design,this thesis integrates the calculation and optimization functions into the tool software with the help of Mathematica,which realizes the portability of use and the visualization of output.Finally,a triboelectric-electromagnetic hybrid power generation structure is designed,and the aforementioned triboelectric and electromagnetic theoretical models are applied to this structure.At the same time,experimental tests under multiple parameters verify the validity of the model from the perspective of waveform and amplitude,and provide a practical theoretical analysis scheme for hybrid power generation.The model in this thesis seeks a balance between accuracy and complexity,making the theoretical model more practical.In a conclusion,this thesis conducts theoretical research on different micro-nano energy harvesting technologies,analyses the selection structural parameters,friction material selection and output performance optimization of the generator,and gives design guidelines.Finally,this thesis successfully realized a compact triboelectricelectromagnetic hybrid generator,revealing the potential of hybrid micro-nano energy harvesting technology to solve electrical output problems in the field of wearable electronics,which is of great value in promoting its practical development.