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The industrial use of inductive power transfer systems is becoming widespread ranging from monorail systems, motors, people-movers and battery charging applications. This paper proposes a three-dimensional inductive power transfer system driven by a multiple phase power converter. This is aided by spice circuitry simulation of the power converter, finiteelement-assisted software magnetic frequency analysis and via implementation of the proposed system. The proposed system consists of a cubic power transfer primary window generated by a rotating magnetic flux flow path. This rotating field is loosely coupled via magneto-motive force induction into a secondary power pick-up. The system has been demonstrated as a lowpower battery charging system.

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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.

Inductively coupled power transfer systems (ICPT) are becoming ubiquitous in industry. Many such systems are excited with single or multi-phase input current. This leads to increased complexity in comparing such systems when solely using the magnetic frequency analysis. This paper utilizes modern finite element method analysis software to propose a novel software methodology for the numerical comparison of single and two phase ICPT systems as demonstrated on a three dimensional (3D) battery charging system. The sinusoidal magnetic frequency response of a single phase system is compared to the magnetic transient response of a multi-phase current system by use of a novel software methodology proposed in this paper. This consists of a transient response analysis to determine compute the resulting magnetic response over the duration of an input current period on the two phase system. The resulting non-sinusoidal response is then integrated over a whole period to extract the root-mean-square value for comparison with that of a single phase system across a 3D cubic power zone.

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To date, a vast majority of near-field magnetic induction applications tend to largely support uni-or bi-directional planar movement of loads. This is due to a lack of omni-directional magnetic field distribution provided by the electromagnetic structures. This paper demonstrates the concept of an omni-directional near-field wireless power transfer source capable of supporting three-dimensional load displacements. This is done by developing customized electromagnetic structures assisted by modern finite element method analysis computation software. In particular, two models are developed for investigation into both continuous and discontinuous modes of operation. The magnetic frequency response was simulated at an AC frequency of 155kHz. From analysis of the fundamental parameter governing performance metrics, the magnetic flux density, was tailored to support load displacement along three orthogonal axes. The resulting magnetic structures are intended for use as a loosely coupled near-field inductivelycoupled-power-transfer system.