Abstract
The misalignment of the resonant coils in wireless power transfer (WPT) systems causes a sharp decrease in transfer efficiency. This paper presents a method which improves the misalignment tolerance of WPT systems. Based on electromagnetic simulations, the structural unit parameters of the electromagnetic material were extracted, and an experimental prototype of a four-coil WPT system was built. The influence of electromagnetic metamaterials on the WPT system under the conditions of lateral misalignment and angular offset was investigated. Experiments showed that the transfer efficiency of the system could be maintained above 45% when the transfer distance of the WPT system with electromagnetic metamaterials was 1 m and the resonant coils were shifted laterally within one coil diameter. Furthermore, the system transfer efficiency could be stabilized by more than 40% within an angle variation range of 70 degrees. Under the same conditions, the transfer efficiency of a system without electromagnetic metamaterials was as low as 30% when lateral migration occurred, and less than 25% when the angle changed. This comparison shows that the stability of the WPT system loaded with electromagnetic metamaterials was significantly enhanced.
Highlights
Wireless power transfer (WPT) technology has matured in recent years [1,2,3,4,5,6], and has been widely applied in fields such as electric vehicles, portable medical devices, and mobile phone charging.some problems remain to be solved, such as electromagnetic pollution, low transmission efficiency at medium and long distances, poor system stability, and so on
Negative magnetic metamaterials (NMM) can mitigate the effects of angular deviation and lateral misalignment in WPT systems
Under the experimental conditions applied in this paper, the transfer efficiency of the system without loading NMM decreased by 18% with maximal lateral misalignment
Summary
Wireless power transfer (WPT) technology has matured in recent years [1,2,3,4,5,6], and has been widely applied in fields such as electric vehicles, portable medical devices, and mobile phone charging. Metamaterials of negative and zero permeability) can enhance efficiency and reduce the magnetic used two orthogonal coils in a 3-D model to achieve orthogonal transmission, which is field distance systems goodinatshort resisting angular drift. A new structure using metamaterials was designed to improve the transfer increasing efficiency It has efficiency, been reported that WPT systemsbywith hybrid metamaterial slab (combined with for use in portable devices, the leakage magnetic field and the magnetic metamaterials of negative andshielding zero permeability) can enhance efficiency andfocusing reduce theon magnetic field field. We propose an innovative approach using electromagnetic metamaterials to improve an established four-coil of WPT experimental results showed that the WPTtheory, system with the antioffset capability.
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