非接触电能传输系统的松耦合变压器实验研究

Experimental research of loosely coupled transformer in contactless power transfer system

松耦合变压器作为非接触供电系统的关键部分之一,由于磁路中有较大距离的空气磁路,变压器漏感较大,耦合系数不高,因此严重影响了能量传输功率和效率。文中针对影响变压器耦合系数的因素,利用有限元软件ANSYS分别对U、E型两种形状磁芯的磁场分布随气隙大小和绕组位置进行有限元仿真研究,由磁力线的分布和走向可以看出这两个量对耦合系数的影响。进而提出一种可以提高耦合系数的改进磁结构的松耦合变压器,实验验证了理论分析。

As one of the key part in the contactless power transfer system, the loosely coupled transformer has a larger air gap which makes the transformer have higher leakage inductances and lower coupling coefficient, so the efficiency and transfer character is very low. In the paper, we analyse the factors which have relation with the coupling coefficient in the transformer, and make simulation about the U,E-type magnetic core respectively when the air gap and winding location are changing with the help of ANSYS software, and we can find that the air gap and winding location have what affection to the coupling coefficient from the distribution and direction of the magnetic line. Furthermore, we find a new loosely coupled transformer which is made of some improved magnetic structure to improve the coupling coefficient, and the experiments testify the correctness of analysis and conclusion of the paper.