Coil Optimization Design of RWPT System Based on Response Surface Methodology

Wireless power transfer (WPT) technology is widely applied in daily life. However, in rotary wireless power transfer (RWPT) systems, performance is compromised due to coil misalignment. This paper analyzes the RWPT system using LCC-S compensation topology and optimizes the dimensions of the coupling coils using a fast and universal method. Specifically, a finite element model of the coupling coil is established and analyzed. Then, the sensitivity of the coupling coefficient to various parameters of the coupling coil in the RWPT system is analyzed using response surface methodology (RSM). The response surface results are optimized using evolutionary algorithms. A Pareto solution is selected, and joint simulations using Maxwell and Simplorer are performed to validate the effectiveness of this method. After optimization, the effective coupling range of the coil is increased by 46%, and the system robustness is significantly improved.