摘要
在非接触电能传输系统中，变压器的耦合系数直接关系到系统的变换效率。为提高非接触变压器的耦合系数，同时减小其体积、质量，给出改进的变压器磁芯结构及绕组排列方法，并结合电磁场仿真结果，提出新型非接触变压器的磁路模型。根据耦合程度不同，将总磁通分为无耦合、部分耦合和全耦合3部分。基于变压器磁路模型和该磁通分类方法，给出各部分磁阻和变压器耦合系数的量化计算方法，并进一步给出变压器优化设计方法，提出边沿扩展平面U型磁芯结构。采用优化后的变压器结构，设计了35V～60V输入、60W输出的非接触变换器。变压器耦合系数的计算结果和测试结果一致，证明了所提磁路模型及耦合系数计算方法的正确性。与采用PlanarE64磁芯相比，在10mm气隙条件下，变压器耦合系数可从0．53提高到0．6，磁芯质量从122g减小到60g，最高变换效率提高了约2．5％。
Coupling coefficient （k） of a transformer is a key parameter affecting the efficiency of a contactless energy transmission system. Aiming to obtain higher k, smaller size and lighter weight for the contactless transformer, techniques for the improvement of core structure and coil arrangement were proposed. With the help of the magnetic field simulation results using Ansoft 2D, a new magnetic reluctance circuit was proposed for the transformer. Based on magnetic flux coupling, the magnetic flux of the proposed transformer could be divided into three parts： uncoupled, partially coupled and fully coupled. And thus the magnetic flux tube was analyzed and five steps calculation visualized the effect of the core geometry parameters on the reluctance and k. Further optimization was taken and a novel contactless transformer was fabricated for a 60W contactless energy transmission system. The k calculated was verified with experimental measurement to be very accurate. A contactless transformer with k of 0.6 and weight of 60g was achieved. Compared with our previous transformer having k of 0.53 and weight of 122g, the new transformer offers about 2.5% improvement in the maximum efficiency.
出处
《磁性元件与电源》
2011年第5期129-138,118,共11页
Components and Power
基金
国家自然科学基金项目（51077069）
香港研究资助局基金项目（PolyU 5306/06E）
江苏省自然科学基金项目（BK2009372）.
关键词
非接触变压器
耦合系数
磁路模型
Ansoft2D
contactless transformer, coupling coefficient, magnetic reluctance circuit, Ansoft 2D
