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ABSTRACT
The spatial electromagnetic field of electric vehicle (EV) wireless charging stations may experience a superposition effect, which will increase the electromagnetic radiation. To assess the safety of electromagnetic exposure from wireless charging stations, this study employs a finite element simulation software to construct an electromagnetic environment model for a compact wireless charging station. The model is utilized to compute the superposition effect of spatial electromagnetic fields resulting from the simultaneous charging of multiple wireless chargers. Furthermore, the model assesses the levels of electromagnetic exposure on human models at eight observation points situated within the charging station. Results indicate that the volume average values of spatial magnetic induction strength (B) and electric field strength (E) are higher when multiple EVs are charged simultaneously than when a single EV is charged, and the electromagnetic radiation received by a human standing between two vehicles is greater than that near one vehicle. At the 22 kW charging power level, the maximum values of B, E and current density at the eight observation points of the charging station are all below the International Commission on Non-Ionizing Radiation Protection limit, demonstrating that the human body is safe in compact wireless charging stations at this power level.
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Nomenclature
| EV | = | electric vehicle |
| ICNIRP | = | International Commission on Non-Ionizing Radiation Protection |
| B | = | magnetic induction strength |
| D | = | electrical flux density |
| E | = | electric field strength |
| H | = | magnetic field strength |
| J | = | current density |
| M1 | = | mutual inductance |
| RL1 | = | transmission coil series resistance |
| RL2 | = | receiving coil series resistance |
| ρ | = | charge volume density |
| μ | = | magnetic permeability |
| ε0 | = | dielectric constant of vacuum |
| εr | = | relative dielectric constant |
| σ | = | conductivity |
| ω | = | angular frequency |
| η | = | analytical efficiency |
Disclosure statement
No potential conflict of interest was reported by the author(s).
Author contributions
Wenting Mou and Mai Lu conceived the research and contributed to the research survey and data analysis. All authors have read and agreed to the published version of the manuscript.
Data availability statement
The authors confirm that the data supporting the findings of this study are available within the article.