A Method for Evaluating the Position Tolerance Performance of a Planar Magnetic Coupling Resonant Wireless Power Transfer System

Currently, there is no standardized approach for evaluating the efficiency of planar wireless power transfer (WPT) systems across varying specifications and sizes, particularly under positional deviations. This paper introduces an innovative approach to assess the positional tolerance of single-transmitter, single-receiver planar magnetically coupled resonant wireless power transfer (MCR-WPT) systems. We present a normalized effective working range that quantifies the operational range of different MCR-WPT systems where transmission efficiency degradation is limited to a specified value, such as <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\sigma$</tex> %. This approach measures the system's resilience to coil misalignment and identifies key parameters influencing transmission efficiency. The practicality and effectiveness of the proposed method are demonstrated through experimental validation.