Computation of the mutual inductance between circular filaments with coil misalignment

Although electric vehicles (EV) are a favoured solution for a greener energy, they require sufficient battery storage on board in order to provide sufficient driving autonomy. Plug-in connectors have been commonly proposed for EV battery charging. However, these are inherently unsafe due to the exposed electrical terminals. Contactless inductive power transfer (CIPT) systems provide a modern technology suitable for wireless transfer of electric power for EV battery charging. However, coil misalignment is its inherent problem since the mutual inductance depends on the shapes and orientations of the two coils in the CIPT transformer. In this paper the authors analyse the impact of coil misalignment on the mutual inductance between circular filaments. This investigation is achieved by computing relevant and advanced models formulated in the literature for computing circular filaments with coil misalignments. Detailed results obtained using SCILAB application software are given.