Simulation And Research On Improving The Efficiency Of UAV Magnetic Coupling Wireless Charging

In recent years,with the increasing development and popularity of drones,to a certain extent,people’s work and lifestyle have been changed,and new models and developments have emerged.However,the long-term flight of drones has always plagued its further development.In order to meet the needs of modern energy ecology,electric drones have become the main force in the drone market.In terms of charging,the emergence of wireless charging technology can make up for it.The limitation of short battery life.Under normal circumstances,there are two ways to increase the flight time of electric drones.One is to expand the battery capacity,and the other is to use a charging station to charge the battery at any time.The former is undesirable due to load problems,and the latter is feasible,but charging Distance and charging efficiency are still the focus of optimization.Improvement and optimization of wireless charging transmission efficiency on the existing basis will benefit the healthy development of wireless charging for unmanned aerial vehicles,reduce energy waste due to low wireless charging efficiency,and provide guarantee for global sustainable development.Although there have been several different ways of wireless charging technology combined with drones and achieved certain results,its safety and feasibility still cause people to worry about it.And in the wireless charging process,due to low transmission efficiency and different materials of the transmission medium,a lot of energy waste will occur.Based on the above background,the following studies have been carried out:First,it introduces the industry situation and background of wireless charging for drones,the classification of wireless charging technology and the research situation at home and abroad,as well as the current status and development direction of wireless charging technology for drones at home and abroad.Then introduced the magnetic coupling technology,and four basic compensation networks,and analyzed their circuits.Then use Matlab software to simulate to obtain the relationship between the transmission efficiencyη and the coupling coefficient value,and it is found that the serial-string compensation and serial-parallel compensation network structure is suitable for UAV wireless charging.When the coupling coefficient is greater than 0.25,the theoretical transmission is The efficiency is over 90%.Secondly,in the ANSYS Maxwell simulation software,the coil model of the wireless charging system is constructed and analyzed,and the conclusion is reached: when the current value between the two coils is different,the coupling coefficient value,the magnetic field intensity and the magnetic induction intensity are also different,showing In the case of the same model,the larger the current value,the larger the coupling coefficient value,and the stronger the magnetic field intensity and magnetic induction intensity.In the same simulation environment,when most non-metallic materials are used as the packaging material between the two coils,the magnetic field strength and magnetic induction strength are not affected by the existence of the material,but the intensity changes,which are basically the same as the strength when there is no material packaging;When packaging with a metal material whose relative permeability is not 1,the simulation results show that the magnetic field strength and magnetic induction intensity around the two coils become very weak,and the existence of the material produces a shielding effect;and the relative permeability is 1 When the left and right metal materials are packaged,they neither enhance nor weaken the magnetic field environment.Different materials are used as spacers between the two coils of wireless charging.The coupling coefficient and mutual inductance values calculated by the simulation software are different.When the calculated coupling coefficient value is very small,the material will hinder the magnetic field.Finally,an experimental platform was built,and the experiment was verified in the same experimental environment.Different materials are used as the packaging material between the two coils.During the wireless charging process,on the one hand,the temperature rise is different,which is related to the physical properties of the material itself,and the temperature change of the metal material is more obvious during the charging process,which can reach Above 85 ℃.However,after the charging time of non-metallic materials reaches a certain length of time,the surface temperature of the material no longer changes significantly,generally below 45 ℃.On the other hand,as long as the material does not have an obstructive effect on the magnetic field,the charging efficiency can reach more than 60%,and when most non-metals are used as packaging materials,the transmission efficiency is about 80%.It is verified that the smaller the distance between the transmitter and the test module,the better the transmission of power;the appropriate distance should be selected for wireless charging of the UAV to avoid energy waste.Through the above research,we can know that no matter what the scenario is,if appropriate packaging materials are selected,to a certain extent,the wireless charging transmission efficiency of UAV can be significantly improved on the original basis,and the performance of UAV can be better brought into play.This provides a new possibility for the diversity of wireless charging products.