Abstract
A structure optimized method based on the artificial fish swarm algorithm (AFSA) for the soft magnetic strips of the inner double-layer shield is proposed in this paper and applied to the coupler of the wireless power transfer (WPT) system of an electrical vehicle (EV). Some structure parameters including length, height, width and distances of the strips are selected to fit their relationships with the coupling coefficient, which directly effects the transfer efficiency of the coupler by the linear fitting method. Based on these relationships, a group of parameters is obtained by the AFSA with the largest coupling coefficient and suitable volume to achieve optimal transfer efficiency without lots of repetitive results of the finite element analysis. The effectiveness of the proposed method is demonstrated quantitatively according to the outcomes and comparisons among different structure parameters and algorithms.
Highlights
With the development of the electrical vehicle (EV), the requirements of the supporting facilities of the EV are increasing, such as enough parking areas and charging piles
The shields are covered on the outside of the coils to make the magnet field gather between them
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Summary
With the development of the electrical vehicle (EV), the requirements of the supporting facilities of the EV are increasing, such as enough parking areas and charging piles. The transfer efficiency of the coupler is a serious problem as it limits the application of the WPT [4] To solve this problem, some improvements to the shapes of the coils are presented, such as double D-type (DD) [5], double D-type quadrature (DDQ) [6], Taichi [7], bipolar pad (BP) [8], tripolar pad (TQ) [9] and quadruple pad (QP) [10], where the DDQ has a more stable charging process and better anti-offset performance than the quadrature coil, and the latter three types have less leakage in the magnetic field from the additional pads which require a larger covered space. An optimal structure parameter selection method for the inner layer strip using the soft magnetic material is proposed in this paper to realize the best coupling coefficient and transfer efficiency of the coupler of the WPT system.
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