电动汽车无线充电高效高利用率磁芯的多目标优化设计

doi:10.19562/j.chinasae.qcgc.2023.ep.008

Abstract

Abstract:

In this paper， based on the asymmetric DD coil and LCC-SP topology of electric vehicle for wireless charging， a novel magnetic core structure is designed and optimized to solve the problem of high magnetic loss and low utilization of the core caused by the non-uniform magnetic flux of the transmitting core. Firstly， the equivalent circuit model and the equivalent magnetic circuit model of the reference coils are established， providing theoretical support for the calculation of magnetic core loss and the layout design of the core structure. Meanwhile， the evaluation index of magnetic flux uniformity CV（B） is proposed， and its quantitative relationship with magnetic core loss and core volume is established， providing the optimization direction and optimization boundary for the magnetic core. Then， based on the coils’ equivalent model， a novel transmitting core structure is proposed， and sensitivity analysis is carried out on its key structure parameters to reduce the complexity of optimization variables. Finally， with the maximum coupling coefficient and the minimum uniformity coefficient as the optimization objectives， the novel core structure optimization based on NSGA-II multi-objective optimization algorithm is completed by the Co-simulation of COMSOL and Matlab. The results show that the utilization rate and efficiency of the optimized core have been improved， with the volume of the optimized core only 60% of the original reference core， the coil transmission efficiency increased to 98.117%， and the core loss reduced by about 10 W， which proves the effectiveness of the proposed optimization method.

Key words: wireless charging, magnetic flux uniformity, novel core structure, multi-objective optimization

Meng Xiong,Dong Zhang,Guojian You,Tianfei Sun,Kai Sheng,Xuezhe Wei. Multi-objective Optimization Design of High Efficiency and High Utilization Magnetic Core of Wireless Charging of Electric Vehicles[J].Automotive Engineering, 2023, 45(9): 1740-1752.

Figures/Tables 19

约束参数	优化边界范围值
磁通密度上限值B_max	B_max≤200 mT
发射端激励电流I_{1_RMS}	$I 1_R M S = 2 π P O Q 4 U i n = 34 ? A$
接收端激励电流I_{2_RMS}	$I 2_R M S = 22 U i n ω M π Q$
磁芯体积削减系数α	0.4≤α<1
凸台高度值T₀	0 mm≤T₀≤20 mm
各阶梯层长度占比A_1/2/3/4	10%≤A_1/2/3/4≤50%且A₁+ A₂+A₃+A₄=100%
各阶梯层厚度值T_1/2/3/4	4 mm≤T₄ <T₃<T₂<T₁≤16 mm
线圈间耦合系数k	k>0.289
磁通均匀系数CV（B）	CV（B） <1.113

References 26

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参数名称及符号	初始参数值	参数扫描范围
磁芯总长度L_{all_0}	800 mm	［400 mm，800 mm］
凸台高度T_{0_0}	0	［0，20 mm］
各阶梯层长度占比 A_{1_0}、A_{2_0}、A_{3_0}、A_{4_0}	各占L_all/2长度的25%	［25%，50%］
阶梯层厚度T_{1_0}	16 mm	［12 mm，16 mm］
阶梯层厚度T_{2_0}	12 mm	［8 mm，12 mm］
阶梯层厚度T_{3_0}	8 mm	［4 mm，8 mm］
阶梯层厚度T_{4_0}	4 mm	［0，4 mm］

耦合参数名称	参考发射线圈	优化发射线圈
线圈自感	78.33 μH	81.42 μH
线圈互感	18.66 μH	20.53 μH
耦合系数	0.289	0.312
发射端交流电阻	82 mΩ	78 mΩ
线圈等效电阻	29 mΩ	29 mΩ
铝板等效电阻	19 mΩ	24 mΩ

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Multi-objective Optimization Design of High Efficiency and High Utilization Magnetic Core of Wireless Charging of Electric Vehicles

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References 26

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