| Autonomous Underwater Vehicle(AUV)plays an important role in scientific exploration,resource development and homeland security assurance as a kind of marine exploration equipment,but AUV also faces problems such as insufficient AUV endurance and short cruising distance.Compared with the traditional charging method,Wireless Power Transmission(WPT)provides a new means to solve the range problem of AUVs.However,the perturbation of seawater can cause deviations in the relative positions of the transmitting and receiving ends of the magnetic coupling mechanism of the Underwater Wireless Power Transmission(UWPT)system,which affects its transmission performance and stability.In order to solve the issue,the magnetic coupling mechanism structure and its parameter design approach are examined in this study.First,the transmission mechanisms of the UWPT system are analyzed.The composition and working principle of the UWPT system are analyzed.By analyzing the propagation characteristics of electromagnetic waves in different media,the operating frequency range of the UWPT system is determined.The advantages and disadvantages of the four basic compensation networks are also compared,and the SS-type compensation network is selected for reactive power compensation of the system.Considering the influence of seawater medium on the system,an equivalent circuit model of the UWPT system was constructed to provide a theoretical basis for the next study.Secondly,the squirrel cage magnetic coupling mechanism structure and its parameter design method are designed.A set of design principles for magnetic coupling mechanism is summarized with the application scenarios of UWPT system and the selection of magnetic coupling mechanism materials is investigated.Based on this,a squirrel cage magnetic coupling mechanism is designed for AUV shape characteristics and deviation resistance requirements,and the analysis of the factors affecting its coupling performance is developed.Through the study of the transmission characteristics of SS type compensation network,a magnetic coupling mechanism parameter design method is proposed,and the parameters of the squirrel cage magnetic coupling mechanism are designed according to this method.Then,the performance of the squirrel cage magnetic coupling mechanism is analyzed.The effect of deviations in the inductance parameters of the magnetic coupling mechanism on the transmission performance of the system is analyzed,and it is found that the system working in a fully resonant state is a prerequisite for efficient energy transmission.Next,the deviation performance of the squirrel cage magnetic coupling mechanism is simulated and analyzed using finite element simulation software,the results show that the squirrel cage magnetic coupling mechanism has excellent resistance to deviation.The eddy current loss expression in seawater medium is obtained by Maxwell’s equations,and the eddy current loss of the squirrel-cage magnetically coupled mechanism was simulated and analyzed by using finite element simulation software.Finally,the experimental platform of UWPT system was built.By comparing the measured data of the prototype with the simulation data,it is proved that the prototype can meet the design requirements.The system transmission characteristics were verified with variablevoltage and variable-load experiments.In the seawater medium,the system has a transmission power of 600.62 W when fully aligned,a transmission efficiency of 94.429% for the magnetic coupling mechanism,and an overall system efficiency of 87.021%.by the deviation experiment proves that the output power of the system is not less than 600 W within the specified deviation range,the transmission efficiency of the magnetic coupling mechanism is not less than 90%,and the overall efficiency of the system is above 85%,which meets the design index. |
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