Optimal resonant frequency analysis for underground wireless power transfer with metal tube interference
Source abstract
Abstract
Magnetic resonant wireless power transfer (MR-WPT) has several advantages over conventional wired underground power supply methods. However, MR-WPT inevitably encounters metal conductors, which reduce the system efficiency through the eddy loss induced in the conductor by high-frequency electromagnetic waves. In this paper, the effect of resonant frequency variations caused by metal tube interference with the aim of maximizing the system efficiency is studied. According to the variation in the resonant frequency, the system efficiency is analytically derived by an equivalent circuit model. Electromagnetic simulations are carried out to further analyze the metal tube interference on the system. The results demonstrate the existence of an optimal resonant frequency that maximizes the system efficiency. Aluminum tube interference produces a lower optimal resonant frequency and higher efficiency than a 304 stainless-steel tube. When the metal tube is slotted, the optimal slot width and number of slots enhance the maximum efficiency and reduce the optimal resonant frequency and frequency drift. With slot widths of 2 and 8 mm, the system efficiency reaches ∼67% at 40.1 kHz and 55% at 48 kHz, respectively. Finally, different types of slotted tubes are fabricated, and the theoretical results are experimentally verified.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Wireless Power Transfer Systems · Energy Harvesting in Wireless Networks · RFID technology advancements
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Mechanical Engineering and Electronic Information, China University of Geosciences 1 , Wuhan 430074, China
School of Mathematics and Physics, China University of Geosciences 2 , Wuhan 430074, China
Faculty of Engineering, China University of Geosciences 3 , Wuhan 430074, China
Funding
National Key Scientific Instrument and Equipment Development Projects of China
References (38)
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