volume | PIER Journals

Abstract

In the dynamic wireless charging system for intelligent rail vehicles, coil misalignment causes mutual inductance fluctuations, resulting in significant output power variations and low transmission efficiency. To address this, a reverse series multilayer interactive coil (RSMIC) structure is proposed. This configuration enhances mutual interaction between coils by incorporating reverse-wound coils, symmetrical DD coils, and magnetic cores, thereby improving the system's misalignment tolerance. First, the structural characteristics of the RSMIC coils are introduced, and their mutual inductance patterns are analyzed. Next, based on a vector magnetic potential mutual inductance calculation method, coil and core parameters are optimized using a mutual inductance fluctuation minimization strategy to achieve quasi-constant mutual inductance and improved transmission efficiency. Ultimately, a wireless charging system was developed according to the optimization outcomes, and its accuracy was validated via both simulation and practical tests. The findings show that even when the ferrite-aided RSMIC coil is misaligned by up to 55% (184.8 mm) of the transmitter coil's external length, the highest variation rate in mutual inductance remains as low as 4.79%, enabling the system to attain a transfer efficiency of 97.35%.

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Dr. Yonghong Long

Dr. Jialin Zou

Dr. Zhongqi Li

Mr. Chenxi Zhang

Dr. Junjun Li