Research On Wireless Power Transmission Mode Based On Multi-DOF And Underwater Application

The research of wireless power transmission?WPT?began a century ago.It has made remarkable progress in smart phones,wearable devices,medical devices,transportation and other fields.Space wireless power transmission technology can supply power to the hollow spherical multi-DOF motor and it has better offset tolerance.The underwater electric field coupled wireless power transmission can supply power to the underwater robot without cable and the electric equipment in the ocean.It can obviously improve the safety and stability of electrical equipment.In this paper,two kinds of wireless power transmission modes,space electromagnetic induction and underwater electric field coupling,are studied and analyzed.In this paper,a three-degree-of-freedom motor with a hollow spherical rotor by wireless power transmission scheme is proposed.When applied to the Bionics field,a wireless transmission device and a visual image acquisition device need to be placed in the rotor.In order to compensate for the disadvantages brought by the cable charging of the motor during rotation and realize the wireless transmission of the internal collection device,a new type of wireless charging device suitable for the three-coil receiving structure of the motion device is designed,and compared with the traditional single-coil receiving structure.The new three coil coupling structure and single coil coupling structure are simulated,and the changes of S₂₁1 parameters,flux and efficiency in different angles are compared.A new wireless power transmission experiment platform with three coil structure is built.The LC double-sided underwater electric field coupled wireless power transmission system is designed.The mutual capacity model,equivalent capacitance circuit and compensation network of the coupling structure are analyzed.The LC double-sided CPT circuit model is built based on the SIMULINK simulation platform,and the voltage and current waveforms are obtained.Through COMSOL multi physical field simulation,the model is established,compared in air and water medium,the equivalent capacitance of coupling mechanism is calculated,and the field strength distribution is studied.Finally,an experimental platform of underwater wireless power transmission system is built.