Optimized Design And Experimental Research On The Coupler Of Wireless Charging System For Autonomous Underwater Vehicle

The Autonomous Underwater Vehicle(AUV)has important economic value and scientific merit both in civil and military fields.Due to limitations of its own volume and battery technology,AUV cannot work underwater for a long time,and must return to the base station or mothership to get charged before the power runs out.This method is not convenient and flexible,leads to poor efficiency and concealment of AUV.The underwater wireless charging technology can help the AUVs to improve their flexibility,efficiency and covertness of in energy-obtaining.In light of the aforementioned problems and requirements,a wireless charging system circuit model using inductive coupling technology was first established to analyze the influence of various parameters on system performance and eventually revealing that the increase in coupling capacity can improve transmission power and efficiency.The thesis then studies the distribution of magnetic circuit through the magnetic circuit modeling and finite element simulation,takes the arc shell structure into consideration,and then designs a coupling device for a new magnetic core(?core).The air gap between the primary and secondary sides is reduced,helping to improve the coupling ability.In view of the special requirements of AUV,a design approach for the optimization of the coupling device is studied to optimize its occupied area,dead weight and power transmission capability.The genetic algorithm was used to design the size parameters for the core.Then it is iterated by space constraints,area product requirements and coupling coefficient requirements,and combined with finite element analysis to determine the optimal size parameters.On that basis,the three-dimensional graph set is drawn by Matlab to study the variation trend of power and efficiency with the primary and secondary inductances and load resistances,providing guidance for the design of the primary and secondary inductances parameters and the selection of the optimal load resistance.And a preliminary validation was performed in the mathematical model.The influence rule of misalignment on the performance of the coupling device and relevant measures were analyzed.The magnetic field model of the coupling device was built in Maxwell to simulate possible misalignment(offset angle change,back-and-forth misalignment,and air gap change).By the displacement simulation with a step of 1mm in the radial direction,a step of 2mm in the axial direction,and a step of 1oin the angle,the coupling coefficient data was obtained and the variation law was studied,founding that AUV is sensitive to radial offset.Therefore,this thesis designs a circular docking device to reduce the influence of radial offset on the performance of the coupling device and analyzes its design approach and working process in detail.In order to verify the advantages and effectiveness of the new coupling device,a simulation of the wireless charging system for AUV was performed in OrCAD,and the influence of the resonant circuit on the output waveform was studied.Through the design and manufacture of electrical and mechanical docking devices,a 600W prototype was built to conduct the coupling capability tests,experiments on different media,misalignment performance and load change.The results show that when the connection is in good condition,the transmission power is 605.9W,the efficiency is91.312%,and the transmission power per unit area is about 0.2W/mm~2.Within±7oof the angle deviation and±28mm of the front-to-back misalignment,the system can function normally,and the new coupling device has relatively strong tolerance capacity.