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2026-05-04
Design and Experiment of Compact Rotary MCR-WPT Coils at MHz Band
By
Progress In Electromagnetics Research C, Vol. 170, 28-37, 2026
Abstract
Aiming to meet the contactless power supply requirements of rotary equipment, this study investigates the coil design and performance of a small resonator for magnetically coupled resonant wireless power transfer (MCR-WPT) systems operating in the MHz band. Based on the series-series (S-S) WPT circuit topology, the influence of coil inductance on the transmission characteristics of the system was analyzed. By combining the inductance calculation formula for planar spiral coils, the geometric parameters of the coil were designed with the objectives of load power (PRL) > 40 W and transmission efficiency (ηT) > 90%. The rationality of the designed parameters was verified by field-circuit coupled simulation, and the influence laws of the driving frequency and transmission distance on transmission characteristics were also analyzed. The coils were wound according to the designed parameters, and both static and rotary dynamic power transfer experiments were conducted. The simulation results show that the designed coil achieves a transmission efficiency of 94.783% at a transmission distance of 50 mm in the 1 MHz, which meets the preset design objectives. The results of the static experiment and the dynamic rotation experiment show that the overall operating efficiency of the system (ηdc-dc) is 84%. This study demonstrates the feasibility of the proposed coil design method, and the designed small coil can realize high-efficiency and stable wireless power transfer under rotary working conditions. The research findings provide a reference for the coil design and engineering application of rotary MCR-WPT systems in the MHz band and possess practical value for the contactless power supply of sensors in rotary electrical equipment operating in confined spaces.
Citation
Kunming Chen, Yanhong Li, Caiyun Dai, Guo-Qiang Liu, Chao Zhang, and Guanchen Li, "Design and Experiment of Compact Rotary MCR-WPT Coils at MHz Band," Progress In Electromagnetics Research C, Vol. 170, 28-37, 2026.
doi:10.2528/PIERC26021205
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