Mapping Methodology for Self and Mutual Inductance Profiles in IPT Systems

Magnetic couplers (MC) are the key element that enable the power transfer over large air gaps in inductive power transfer (IPT) systems. Numerous designs with different coil and core arrangements have been proposed in the literature. However, the MC sizing process still involves several trial and error iterations to meet the desired specifications. This paper presents a profile methodology that uses fitting equations to extrapolate the coupling profiles and minimize the required number of finite element analysis (FEA) simulation results. A non-polarized circular coupler (FLCP) can be characterized as function of the air gap and lateral displacements using only six charging positions, whereas polarized couplers, such as the bipolar (BPP) or double-D pad (DDP), can be characterized using 18 charging positions. The methodology is validated experimentally using the FLCP, and an average error of 3% was found under different charging positions.

Automated summary

This paper proposes a methodology using fitting equations to extrapolate coupling profiles and minimize the required number of FEA simulation results. Specifically, a non-polarized circular coupler can be characterized using only six charging positions, while polarized couplers require 18 charging positions. Experimental validation shows that this method has good accuracy.