Abstract
To date inductively coupled power transfer (ICPT) systems have already found many practical applications including battery charging pads. In fact, current charging platforms tend to largely support only one- or two-dimensional planar movement in load. This paper proposes a new concept of extending the aspect ratios of the operating power transfer volume of ICPT systems to support arbitrary three dimensional load movements with respect to the primary coils. This is done by use of modern finite element method analysis software to propose the primary and secondary magnetic structures of such an ICPT system. Firstly, two primary magnetic structures are proposed based on contrasting modes of operation and different field directions. This includes a single-phase and multi-phase current model. Next, a secondary magnetic structure is customized to be compatible with both primary structures. The resulting system is shown to produce a 3D power transfer volume for battery cell charging applications.
Highlights
The technique of transmitting power across an air-gap without interconnecting wires is well established via the technique termed magnetic induction [1,2]
A methodology used for comparison is summarized in Equation 11. This method ensures the same magnetomotive force (MMF) in ampere current-turns (N I) ratio is used to account for the section length of coils i in one model and a differing section length of coil j of another model both of the same cross sectional area
The concept is verified by the simulated magnetic flux density (MFD) contour plot visualizing the formation of an additional peak in the absolute center of the power zone
Summary
The technique of transmitting power across an air-gap without interconnecting wires is well established via the technique termed magnetic induction [1,2]. [9] has developed and tested various pick-up designs developed by use of similar software The implementation of such FEM has been described in [10] as an essential part of the magnetic modeling for analysis and improving modern ICPT systems. [8,9,10,11] suggests the accuracy of such simulation software results can fall within 5% of experimentally verified results This motivates the need to develop FEM assisted magnetic structures to support 3D aspect ratios of the power transfer volume and develop a unique battery charging system
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