Abstract
This paper introduces the working principle of the inductive power transfer (IPT) system from the perspective of the electromagnetic field. Using Maxwell’s equations, the analytical solution for the electromagnetic field, synthesized by the primary and secondary circular coils in an IPT system, is deduced in detail to obtain the electric field in the IPT system, and the derivation process is easy to understand for researchers engaged in IPT. The final solutions are obtained by combining analytical derivation and the numerical integration method to find the induced voltage in the secondary coil. Finally, by comparison, the simulation results from the finite element software are in a good agreement with those from the analytical analysis. Moreover, an IPT system is set up to validate the analytical and simulation results, and the maximal relative error is under 6% in different working conditions, which shows that it is feasible to understand the working principle of IPT systems from the viewpoint of the electromagnetic field.
Highlights
Inductive power transfer (IPT) technology is a new type of energy transfer method by which energy is transferred from source to load wirelessly, according to the electromagnetic induction theory.In recent years, IPT has developed rapidly and been used for electric vehicles [1,2], biomedical implantable devices [3,4] and wireless charging in intelligent mobile phones [5]
Finite element software is utilized to compare with the analytical results, and an IPT system is set up to validate the analytical results experimentally
MATLAB is used to provide the numerical results of analytical solutions and the simulation results are obtained through use of the finite element software COMSOL
Summary
Inductive power transfer (IPT) technology is a new type of energy transfer method by which energy is transferred from source to load wirelessly, according to the electromagnetic induction theory. Research methods for IPT systems can mainly be classified into two categories: The coupled-mode theory and the equivalent circuit method These have been proven to be equivalent through analysis with a 4-coil IPT system [6]. The power transfer process from one resonant body to another can be expressed as a first-order partial differential equation according to it We provide an accurate and effective modelling method for IPT systems, as well as. In IPT systems, when the two resonant coils are close, strong coupling exists between them Under these conditions, with the help of coupled-mode theory, it was found that the energy loss in the primary coil was much slower than the power transferred from the primary coil to the secondary coil [8], the energy transmission was quite efficient. Finite element software is utilized to compare with the analytical results, and an IPT system is set up to validate the analytical results experimentally
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