A novel analytical model for rapid evaluation of misalignment characteristics in multiphase wireless power transfer systems

The misalignment performance evaluation in multiphase wireless power transfer (WPT) coils using conventional Finite Element Analysis (FEA) is typically computationally intensive. To address this problem, this paper proposes a novel analytical model for the rapid evaluation of multiphase WPT coil misalignment characteristics. The model is used to evaluate three-phase, five-phase, and six-phase coil configurations. The results indicate that the three-phase and five-phase coils are insensitive to rotational misalignment due to their generation of a stable rotating magnetic field. In contrast, the six-phase coil exhibits significantly higher sensitivity. This is attributed to the specific geometrical constraints of the six-phase topology, which necessitate a coil polarity arrangement distinct from the other configurations, thereby disrupting its tolerance to rotational misalignment. Compared to the traditional FEA approach, which calculates the coupling coefficients and mutual inductances for each coil individually, the proposed method employs an equivalent coil model to rapidly evaluate coil performance under specific conditions.