Abstract
Magnetically coupled resonant (MCR) wireless power transfer (WPT) is a promising technology, which has been widely used in many practical applications. In the practical application environment the misalignments between the transmitting coil and the receiving coil can not be avoided, and it will cause a rapid decline in transmission efficiency. So the misalignments have limited the applications of MCR-WPT technology in many fields. The mathematical formula of transmission efficiency with angular misalignment and lateral misalignment was deduced. And the effects of angular misalignment and lateral misalignment on the transmission efficiency were researched by simulation experiments. And the changing regularity of the transmission efficiency with the change of the angular misalignment and lateral misalignment was obtained. The results show that when there is an angular misalignment between the transmitting coil and the receiving coil, the transmission efficiency can be optimized by adjusting the lateral misalignment between the coils. And when there is a lateral misalignment between the coils, the transmission efficiency can be optimized by adjusting the angular misalignment between the coils. An experimental prototype of MCR-WPT system was built, and experiments had been carried out to evaluate the accuracy of the theoretical analysis. Therefore, the study in this paper lay a theoretical foundation for the analysis of WPT in the complex environment, and also provide a useful reference for the design of WPT system.
Highlights
The energy transmission of wireless power transfer (WPT) technology relies on the invisible medium
This paper focused on the effects of the lateral misalignment and the angular misalignment on the transmission efficiency of the Magnetically coupled resonant (MCR)-WPT system
The MCR-WPT system will achieve the maximum transmission efficiency as the transmitting coil and receiving coil are in the resonant state with the operating frequency
Summary
The energy transmission of WPT technology relies on the invisible medium. WPT technology has the advantages of less physical contact, high safety performance, which can be facilitated to supply power for mobile devices and applied in the complex environments. A novel analytical model for the inductively coupled WPT system was proposed in Ref. 13, in which the effects of the coil misalignment and geometry were addressed in a single mathematical formula, and the calculation formula of magnetic field at the receiving coil was deduced as there is a lateral and angular misalignment between the receiving coil and transmitting coil, but there is no corresponding optimization method. In view that the transmission efficiency of the WPT system will be reduced when the receiving coil is non-coaxially aligned with the transmitting coil, the method of adjusting parameters based on the chaos optimization algorithm was proposed in Ref. 17, which enhances the transmission efficiency effectively. The study in this paper lay a theoretical foundation for the analysis of WPT technology in a complex environment, and provide a useful reference for the design of the MCR-WPT system
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