Design and analysis of unipolar magnetic coupler with improved performance for dynamic wireless power transfer applications / Hassan Khalid

Hassan , Khalid (2024) Design and analysis of unipolar magnetic coupler with improved performance for dynamic wireless power transfer applications / Hassan Khalid. PhD thesis, Universiti Malaya.

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Abstract

Inductive power transfer (IPT) occurs with the assistance of a well-designed magnetic coupler. Unlike static wireless charging, dynamic wireless charging (DWC) is gradually becoming a viable option for charging electric vehicles on the go. DWC has the potential to reduce the cost of EV batteries by minimizing the need for bulky battery packs. However, for it to gain widespread acceptance in the market, the Dynamic Wireless Power Transfer (DWPT) system needs optimization. Concerns arise about the performance of the magnetic coupler within limited size and cost constraints. Conventional magnetic couplers are renowned for their power-carrying capacity and mutual inductance. Nevertheless, the performance of these magnetic couplers is significantly influenced by size and the use of ferrite. Given the limited space in electric vehicles, extending the size of the magnetic coupler is not feasible. Additionally, the use of ferrite adds both weight and cost. Therefore, an optimal solution is necessary to design a pad that meets both performance and cost requirements. In this context, this study proposes a unipolar ferrite-less magnetic coupler with improved characteristics. The presented analysis also suggests that the proposed coil is suitable for both Single Transmitter Single Receiver (STSR) and Multiple Transmitter Single Receiver (MTSR) applications. The proposed coil shape is initially optimized for better performance in an STSR test bench. The results are then validated through a 400W IPT system. Subsequently, the proposed coil transmitter and receiver coils are separately optimized to meet the requirements of the DWPT system. The proposed coil is said to maintain the highest coupling coefficient, low self and side-by-side transmitter mutual inductances, and minimal output pulsations during dynamic operation. In this regard, a 1.7

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