Effect of Planar and Cylindrical Coil Structure Parameters on Transmission Efficiency of Magnetic Resonance Wireless Energy Transmission System

The shape and structural parameters of the coil determine the transmission efficiency of the wireless energy transmission system, and it is an important prerequisite to select the best design scheme to clarify the influencing factors of the transmission efficiency of planar and cylindrical coils. This paper compares and analyzes the influence of coil structural parameters on transmission efficiency, such as coil inner radius, coil turns, transmission distance, and coil offset, when the magnetic resonance wireless energy transfer system of cylindrical coil and planar coil is always in a resonant state. Firstly, the Maxwell simulation software is used to calculate the self-inductance and mutual inductance of the coil, and then the compensation capacitor size is determined by HFSS, the resonant frequency of the coil is adjusted to 350 kHz, and finally the transmission efficiency of the wireless energy transmission system is simulated and calculated when the load is 10 Ω. The results show that when the radius in the coil is large and the transmission distance is close, the transmission efficiency of the cylindrical coil is higher than that of the planar coil system. When the inner radius is small or the inner radius is large but the transmission distance is far, the transmission efficiency of the planar coil is higher than that of the cylindrical coil system; cylindrical coil systems are more resistant to deflection than planar coil systems. The results of this paper can provide theoretical support for the design scheme of coil selection.