Structural Parameter Analysis And Improvement Of Diamagnetic Levitation Airflow Energy Harvester

With the rapid development of society,wireless sensor networks and low-power electronic devices are widely used in human production and life.The traditional chemical battery power supply method has disadvantages such as low energy density and short life span,and it does not meet the development concept of green environment protection in contemporary society.Airflow energy harvester can convert the widely existing airflow energy in nature into electrical energy for electronic devices,which is considered as a long-term,efficient and green way to power electronic devices and has become a hot research direction for scholars at home and abroad.This thesis further investigates the diamagnetic levitated airflow energy harvester proposed by the group,provides a theoretical basis for the selection of structural dimensions by analyzing the key structural parameters of the harvester,determines the design basis of the rotor and designs a new rotor with a resin shell to improve the output performance of the harvester.First,the magnetic force,diamagnetic force,eddy current damping,air damping and other forces on the collector are studied,analyzed,and the corresponding expressions are derived,and the key forces are simulated using the finite element method.Secondly,the static levitation characteristics of the antimagnetic levitation structure in the vertical direction and the recovery force in the horizontal direction are studied by simulation and experiment,and the influence of the parameters of the antimagnetic levitation structure on the activity space of the levitating rotor in the monostable and bistable states is analyzed by the regression orthogonal design method,and the regression equation that can predict the activity space is obtained,and the optimal combination of parameters corresponding to the maximum activity space is obtained,and the predicted value of the optimal combination The predicted value of the optimal combination is close to the real value.Two arrangement schemes of induction coils are proposed,and the influence of the two schemes on the output performance of the collector is investigated to determine the arrangement position of the coils,and further simulation analysis determines the structural parameters such as outer diameter,inner radius and wire diameter of the coils.Finally,the prototype test platform of the airflow energy harvester is built,and the main source of damping force in the rotational motion of the suspended magnet is further verified to be eddy current damping by comparing the lifting speed experiment of the rotor of the suspended magnet with the simulation results of eddy current damping.By studying the effects of different rotor thickness,opening radius and center aperture diameter on the output characteristics of the collector,the design basis of the collector rotor is determined,and a new rotor with a resin shell is fabricated according to the basis,and a voltage of 1.3 V and a power of 30.6 m W are obtained using the new rotor at an air flow rate of 3000 sccm,so that the output voltage and power of the collector are increased by 40% and 96%,respectively,compared with those of the same The output voltage and power of the collector were increased by 40% and 96%,respectively,compared to the same size rotor without resin housing.A portable miniaturized prototype was fabricated to generate 12 V AC voltage at a flow rate of3L/min to verify the working capability and application value of the airflow energy harvester under non-experimental conditions.