Abstract
In order to explore the influence of the electromagnetic force (EMF) on the coupling mechanism in a high-power wireless power transfer (WPT) system, the characteristics of the EMF are investigated by theoretical calculation and simulation. The expressions of the EMF on the WPT structure with magnetic shielding are derived in time domain and frequency domain, respectively. The EMF is divided into Lorentz force and Kelvin force. The distribution and changing regularity of the EMF on the coil and the magnetic shield under different exciting currents are solved by the finite element model, and the harmonic of the EMF is analyzed in detail. The results show that the coil is subjected to the EMF in both radial and axial directions. The EMF on the magnetic shield is opposite to the EMF on the coil, and the force between the transmitting coil and the receiving coil is repulsive. The frequency of the EMF is twice that of the system resonant frequency. An experimental prototype is built to prove the correctness of the predicted characteristics. It is shown that the EMF should be carefully considered in the application of high-power WPT systems.
Highlights
Wireless power transfer (WPT), because of its convenience, safety, flexibility, and some other advantages, has been extensively used in many fields such as mobile phones, biomedicines, smart homes, and communication [1,2,3,4]
Because the materials of WPT system are linear and incompressible, the Korteweg–Helmholtz force density method [15] is used to investigate the characteristics of the electromagnetic force (EMF) coupling coils and magnetic shielding materials, neglecting magnetostriction
Using the laws mentioned above, a reasonable design of the coil and a magnetic shielding can reduce the steady component of the EMF to enhance the reliability of high-power WPT systems
Summary
Wireless power transfer (WPT), because of its convenience, safety, flexibility, and some other advantages, has been extensively used in many fields such as mobile phones, biomedicines, smart homes, and communication [1,2,3,4]. The coupling mechanism in WPT systems, owing to the existence of inductive current and time-varying electromagnetic fields, is inevitably affected by the electromagnetic force (EMF). Is the applications, the magnetic field is alternating, which will generate EMF in various directions, and most main of negative a continuous periodic vibration theforce braking of the mechanism. The characteristics which only considered the receiver and did not obtain exact conclusions on the effects of the EMF on on a ferromagnetic material in a WPT system were analyzed in reference [18], which only considered the system.
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