A study of the magnetic field emissions from a vehicle-mounted wireless power transfer system for safe operation when charging EV batteries
Wireless Power Transfer (WPT) is an alternative method of Electric Vehicle (EV) battery charging, particularly for fleet vehicles and people with mobility issues. The safe operation of WPT systems should therefore be of interest and importance to system designers, installers, and end-users. One aspe...
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Elsevier
2025-02-01
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| Series: | Green Energy and Intelligent Transportation |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2773153724000999 |
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| author | Craig McIntyre Silvia Konaklieva Artur Benedito Nunes Richard A. McMahon |
| author_facet | Craig McIntyre Silvia Konaklieva Artur Benedito Nunes Richard A. McMahon |
| author_sort | Craig McIntyre |
| collection | DOAJ |
| description | Wireless Power Transfer (WPT) is an alternative method of Electric Vehicle (EV) battery charging, particularly for fleet vehicles and people with mobility issues. The safe operation of WPT systems should therefore be of interest and importance to system designers, installers, and end-users. One aspect of safe operation is the potential exposure to high-power electromagnetic fields. There are international guidelines with recommended exposure limits that system designers can design and test to. Simulations can be used to predict magnetic field levels, but these should be developed in conjunction with physical measurements to improve the accuracy of such simulations.1 Several factors can influence the WPT generated electromagnetic field, in regions where end users could be located during charging operation. These factors were studied for an in-house designed WPT system retrofitted to an electric vehicle. The magnetic field was physically measured around the vehicle for different operating conditions (alignment, power transfer level and probe position) to assess performance against recommended exposure levels, observe any trends in measurements and study the impact of the probe position.Coil currents were measured and used within an initial simulation to predict magnetic field for comparison to physical values. The initial simulation predicted the trend of the magnetic field with reasonable accuracy. Where there was a difference in magnitude, the physical measurements highlighted that a High Frequency (HF cable) used within the vehicle assembly (not included in initial simulation) contributed to the magnetic field intensity. Overall, magnetic fields were within permitted exposure limits at 10 kW power and good alignment, and with misaligned coils, the system showed only minor exceedance of the most stringent limits, and DC–DC system efficiency was only slightly reduced. |
| format | Article |
| id | doaj-art-9800b9ffd2be4c388b5ddb5460f87a99 |
| institution | Kabale University |
| issn | 2773-1537 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
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| series | Green Energy and Intelligent Transportation |
| spelling | doaj-art-9800b9ffd2be4c388b5ddb5460f87a992025-01-28T04:15:01ZengElsevierGreen Energy and Intelligent Transportation2773-15372025-02-0141100247A study of the magnetic field emissions from a vehicle-mounted wireless power transfer system for safe operation when charging EV batteriesCraig McIntyre0Silvia Konaklieva1Artur Benedito Nunes2Richard A. McMahon3WMG, University of Warwick, Coventry, United KingdomWMG, University of Warwick, Coventry, United KingdomCorresponding author.; WMG, University of Warwick, Coventry, United KingdomWMG, University of Warwick, Coventry, United KingdomWireless Power Transfer (WPT) is an alternative method of Electric Vehicle (EV) battery charging, particularly for fleet vehicles and people with mobility issues. The safe operation of WPT systems should therefore be of interest and importance to system designers, installers, and end-users. One aspect of safe operation is the potential exposure to high-power electromagnetic fields. There are international guidelines with recommended exposure limits that system designers can design and test to. Simulations can be used to predict magnetic field levels, but these should be developed in conjunction with physical measurements to improve the accuracy of such simulations.1 Several factors can influence the WPT generated electromagnetic field, in regions where end users could be located during charging operation. These factors were studied for an in-house designed WPT system retrofitted to an electric vehicle. The magnetic field was physically measured around the vehicle for different operating conditions (alignment, power transfer level and probe position) to assess performance against recommended exposure levels, observe any trends in measurements and study the impact of the probe position.Coil currents were measured and used within an initial simulation to predict magnetic field for comparison to physical values. The initial simulation predicted the trend of the magnetic field with reasonable accuracy. Where there was a difference in magnitude, the physical measurements highlighted that a High Frequency (HF cable) used within the vehicle assembly (not included in initial simulation) contributed to the magnetic field intensity. Overall, magnetic fields were within permitted exposure limits at 10 kW power and good alignment, and with misaligned coils, the system showed only minor exceedance of the most stringent limits, and DC–DC system efficiency was only slightly reduced.http://www.sciencedirect.com/science/article/pii/S2773153724000999Wireless chargingMagnetic field emissionsElectric vehicle charging safetyMisalignmentTransfer power levelCoil currents |
| spellingShingle | Craig McIntyre Silvia Konaklieva Artur Benedito Nunes Richard A. McMahon A study of the magnetic field emissions from a vehicle-mounted wireless power transfer system for safe operation when charging EV batteries Green Energy and Intelligent Transportation Wireless charging Magnetic field emissions Electric vehicle charging safety Misalignment Transfer power level Coil currents |
| title | A study of the magnetic field emissions from a vehicle-mounted wireless power transfer system for safe operation when charging EV batteries |
| title_full | A study of the magnetic field emissions from a vehicle-mounted wireless power transfer system for safe operation when charging EV batteries |
| title_fullStr | A study of the magnetic field emissions from a vehicle-mounted wireless power transfer system for safe operation when charging EV batteries |
| title_full_unstemmed | A study of the magnetic field emissions from a vehicle-mounted wireless power transfer system for safe operation when charging EV batteries |
| title_short | A study of the magnetic field emissions from a vehicle-mounted wireless power transfer system for safe operation when charging EV batteries |
| title_sort | study of the magnetic field emissions from a vehicle mounted wireless power transfer system for safe operation when charging ev batteries |
| topic | Wireless charging Magnetic field emissions Electric vehicle charging safety Misalignment Transfer power level Coil currents |
| url | http://www.sciencedirect.com/science/article/pii/S2773153724000999 |
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