Abstract
Coaxial coil topology is used as the transfer medium in traditional MCR-WPT (Magnetic Coupled Resonant Wireless Power Transfer) systems to improve the transfer characteristics. The intermediate coils are added to extend the transmission distance, whose positions are critical. This paper focuses on the optimal intermediate coil positions for an MCR-WPT system with four coaxial planar circular spiral coils. By modeling the MCR-WPT system, the mathematical expression of the self-inductance and the mutual inductance are used to calculate the load power of the MCR-WPT system, which is composed of four planar circular spiral coaxial coils, and using MATLAB. The optimal distance ratio between the adjacent coils for maximizing the power of load is proposed. Furthermore, the experiments are implemented from the network analyzer and the experimental platform. In the platform, the load power is measured at the different intermediate coil positions, and the optimal position at which the load power is maximized is found. Both experimental results obtained by the network analyzer and the experimental platform have validated the theoretical and simulation results and provided the correctness of the suggested ratios.
Highlights
IntroductionWith the rise of engineering technology and the deepening of theory, the field of wireless energy transmission has gradually become a concern of researchers from academic and industry areas
With the rise of engineering technology and the deepening of theory, the field of wireless energy transmission has gradually become a concern of researchers from academic and industry areas.This technology is used in the electrical equipment to obtain electrical energy from a fixed power grid in a non-contact way, and to improve the safety of the electrical equipment
In addition to accurately measuring the coil inductance and capacitance values used in the experimental platform, the frequency characteristics of the four coil resonant circuits used in the experiment are analyzed through the frequency sweeping function of the network analyzer
Summary
With the rise of engineering technology and the deepening of theory, the field of wireless energy transmission has gradually become a concern of researchers from academic and industry areas. Many researchers have improved the transfer characteristics of MCR (Magnetic Coupled Resonant)-WPT from many aspects [8]. The optimal positions of the intermediate coils are found, and, in these positions, the transfer power of the WPT system with one and two intermediate coils is maximized through simulations. The rest of the manuscript is structured as follows: in Section 2, the theoretical analysis for the system with single and two intermediate coils are considered, and the mathematical expressions of the transfer power are derived. The optimal placements of the intermediate coils are analyzed by simulations
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