Abstract
This paper presents a custom-made, computer-connected, and controlled 3D platform that enables the evaluation of the coupling coefficient between the transmitter and receiver coil parts of an inductive wireless power transfer (IPT) system. The platform includes a computer application, a 3D positioning mechanism, and an inductance measurement circuit. The positioning mechanism moves the coils to the point in 3D space, and the inductance circuit measures the mutual inductance between the transmitter and the receiver coil. The measured value can be used to calculate the coupling coefficient between the transmitter and the receiver coil. The data are sent to the computer for further visualisation. The transmitter and the receiver coil can be evaluated by measuring the coupling coefficient between them in multiple points in space. Measurements performed with the platform can be used in the design and evaluation phases of inductive wireless power transfer systems and to extrapolate the polynomial function of the coupling coefficient in relation to the distance between coils or their misalignment.
Highlights
With the rise in the popularity of electric cars and vehicles, new methods of charging their on-board batteries are being proposed and investigated
The platform used for measuring the coupling coefficient between the transmitter and the receiver coil consists of three parts:
Measurements in the z axis can be used to measure the impact of the distance between the transmitter and the receiver coil on the coupling coefficient
Summary
With the rise in the popularity of electric cars and vehicles, new methods of charging their on-board batteries are being proposed and investigated. The efficiency of inductive wireless power transfer is usually low because of the weak coupling coefficient. One of the possibilities to optimise and increase the efficiency of IPT systems is to optimise the shape and size of the transmitter and the receiver coil [12,13,14,15]. The platform can be used to measure the mutual inductance and coupling coefficient between one transmitter and one receiver coil. A measured coupling coefficient can be used to optimize the control algorithms for IPT systems to increase power transfer efficiency. Simulation software requires a long amount of time to calculate the coupling coefficient between the transmitter and the receiver coil at multiple points.
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