The emergence of wireless energy transfer (WPT) technology provides another option for power transmission, which has the advantages of not being bound by cables, no electric sparks, and high mobility. Currently, wireless energy transfer systems are most widely used in SS-type compensated resonant circuits. With the coupling mechanism configuration determined, the relative position offset between the transmitting and receiving coils will affect the coupling coefficient and thus change the transmission efficiency of the system, so it is necessary to do further research on its coil position. In this paper, a SS-type topology-compensated magnetically coupled resonant wireless energy transfer (MCR-WPT) system based on an E-core magnetically coupled mechanism is analyzed and optimized in terms of the winding method of the receiving coils and the distribution position of the transmitting coils, and then a simulation comparison of the transmission efficiency is carried out according to the basic principle of the SS-type wireless energy transfer system. The simulation results show that the optimized coil position effectively improves the transmission efficiency of the system while taking into account the transmission power.
In order to solve the problems of weak battery life and few charging places of electric vehicles, dynamic wireless charging system (DWCS) came into being. In this paper, the significant mutual inductance fluctuation and the internal coupling of the traditional DD coil in the process of dynamic charging are deeply studied. The size and parameters of the coil are optimized by theoretical design, and a large number of software simulation experiments and experimental verification are carried out on the design scheme. Firstly, the size of transmitting coil is optimized to solve the problem of high mutual inductance fluctuation in dynamic charging process. On this basis, the magnetic field distribution of DD coil was analyzed, the influence of magnetic coupling structure change on coil parameters was compared, the optimization direction of coil was established, a new DD coil was designed, and the mutual inductance function of new DD coil was deduced. Then the electromagnetic simulation software is used to simulate and the experimental platform is built to verify the rationality and feasibility of the design.
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