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Abstract
Wireless charging of Electric Vehicles (EVs) has been extensively researched in the realm of electric cars, offering a convenient method. Nonetheless, there has been a scarcity of experiments conducted on low-power electric vehicles. To establish a wireless power transfer system for an electric vehicle, optimal power and transmission efficiency necessitate arranging the coils coaxially. In wireless charging systems, coils often experience angular and lateral misalignments. In this paper, a new alignment strategy is introduced to tackle the misalignment problem between the transmitter and receiver coils in the wireless charging of Electric Vehicles (EVs). The study involves the design and analysis of a coil, considering factors such as mutual inductance and efficiency. Wireless coils with angular misalignment are modelled in Ansys Maxwell simulation software. The proposed practical EV system aims to align the coils using angular motion, effectively reducing misalignment during the parking of two-wheelers. This is achieved by tilting the transmitter coil in the desired direction. Furthermore, micro sensing coils are employed to identify misalignment and facilitate automatic alignment. Additionally, adopting a power control technique becomes essential to achieve both constant current (CC) and constant voltage (CV) modes during battery charging. Integrating CC and CV modes is crucial for efficiently charging lithium-ion batteries, ensuring prolonged lifespan and optimal capacity utilization. The developed system can improve the efficiency of the wireless charging system to 90.3% with a 24 V, 16 Ah Lithium Ion Phosphate (LiFePO4) battery at a 160 mm distance between the coils.
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1 SRM Institute of Science and Technology, Department of Electrical and Electronics Engineering, Kattankulathur, Chennai, India (GRID:grid.412742.6) (ISNI:0000 0004 0635 5080)
2 University of South Wales, Pontypridd, UK (GRID:grid.410658.e) (ISNI:0000 0004 1936 9035)
3 Graphic Era (Deemed to Be University), Department of Electrical Engineering, Dehradun, India (GRID:grid.449504.8) (ISNI:0000 0004 1766 2457); Al-Ahliyya Amman University, Hourani Center for Applied Scientific Research, Amman, Jordan (GRID:grid.116345.4) (ISNI:0000 0004 0644 1915); Graphic Era Hill University, Dehradun, India (GRID:grid.116345.4) (ISNI:0000 0004 5894 758X)
4 Cardiff Metropolitan University, Cardiff School of Technologies, Cardiff, UK (GRID:grid.47170.35) (ISNI:0000 0001 2034 1556)
5 National Academy of Sciences of Ukraine, Department of Theoretical Electrical Engineering and Diagnostics of Electrical Equipment, Institute of Electrodynamics, Kyiv-57, Ukraine (GRID:grid.418751.e) (ISNI:0000 0004 0385 8977); Center for Information-Analytical and Technical Support of Nuclear Power Facilities Monitoring of the National Academy of Sciences of Ukraine, Kyiv, Ukraine (GRID:grid.418751.e) (ISNI:0000 0004 0385 8977)