Abstract: The magnetically coupled coil of the wireless charging system of electric vehicles is the biggest difference between wireless charging and wired charging, and is the key component of the wireless charging system that can realize the wireless transmission of electrical energy. The paper uses ANSYS Maxwell to build a circular coil and a square coil model, simulates both types of coils, and analyses the influence of the number of turns and transmission distance on the two types of coils; analyses the relationship between coil mutual inductance and coupling coefficient with the number of turns and transmission distance. The relationship between the mutual inductance and coupling coefficient of the coil and the number of turns and transmission distance is also analysed. The results show that the performance of the circular coil is better than that of the square coil for the same number of wires.

Key words: Electric vehicles; Wireless charging system; Magnetic coupling coil; ANSYS Maxwell

摘要： 电动汽车无线充电系统的磁耦合线圈是无线充电和有线充电的最大不同点，是无线充 电系统能够实现电能无线传输的关键部件。论文使用 ANSYS Maxwell 建立圆形线圈和方形线 圈模型，对两种类型线圈进行仿真，分析线圈匝数和传输距离对两种线圈的影响；分析线圈 互感、耦合系数与线圈匝数、传输距离的关系。使用相同数量导线绕制成圆形线圈和方形线 圈，对比分析两种线圈传输性能。结果显示，在导线数量相同的情况下，圆形线圈的性能优 于方形线圈。

关键词: 电动汽车；无线充电系统；磁耦合线圈；ANSYS Maxwell