Olukotun, B; Partridge, JS; Bucknall, RWG; (2019) Impact of Coil Turns on Losses, Output power and Efficiency Performance of Flux-Pipe Resonant Coils. In: Proceedings of 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe). IEEE: Bucharest, Romania.

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Abstract

This paper presents a finite element analysis of five different sizes of flux-pipe resonant coil design with a different number of coils turns but having the identical length of litz copper wire and aluminum shield. The analysis was undertaken to establish the impact of the number of coil turns on the losses, magnetic flux distribution, power output, and power transfer efficiency of flux-pipe resonant coils. From the results presented, it was noted at a constant frequency, an increase in the excitation current causes a significant increase in the ohmic, core, and eddy current losses for each of the coil model designs. Similarly, at constant excitation current, it was observed that the eddy current losses increase significantly with an increase in resonant frequency. In contrast, the ohmic and core losses are relatively constant over the range of resonant frequencies used in the analysis. It was also noted that term k√Qps (where k is the coupling coefficient and Q ps is the product of the quality factor of the primary and secondary coils) has a significant influence on the input power, output power and coil-to-coil efficiency of a particular flux-pipe resonant coil design. Increasing the value of k√Qps increases the value of output power, input power, and coil-to-coil efficiency. Similarly, the lower the coupling coefficient, the higher the required optimum resonant frequency for optimum coil-to-coil efficiency and output power.

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