摘要
非接触变压器是感应电能传输系统中的核心结构,其耦合系数直接影响系统的电能传递效率,因此对其结构优化一直是研究的重点。本文针对一种应用于轨道交通领域的原、副边结构不对称的非接触变压器,根据线性系统的磁场叠加原理,分析了非接触变压器在副边开路和原边开路时其周围的磁场分布,建立了磁路模型,并推导得到原、副边电感及耦合系数的近似计算公式。基于该计算公式对磁路结构进行定性优化,有限元仿真证明了所提磁路模型和参数计算的正确性。在此基础上,利用该磁路模型,优化非接触变压器的结构,提出梯形绕组截面的绕组布置方式,以提高耦合系数;并对原、副边绕组匝数关系进行优化计算,使系统效率最优。根据以上优化,制作非接触变压器实验样机,在48mm气隙下,非接触变压器的耦合系数达到0.45,30k W非接触供电系统在满载时传输效率达到85.3%。
Contactless transformer is the key component in inductive power transfer（ IPT） system and its coupling coefficient（ k） will directly affect the power transfer efficiency. Hence,the optimization of the contactless transformer has been the researching focus. This paper studies a contactless transformer applied in movable vehicle with the structure that primary and secondary side are asymmetrical. Magnetic flux distributions for the conditions that the primary or secondary side is open circuit respectively,are analyzed. According to the superposition principle of magnetic field,magnetic reluctance circuit of this contactless transformer is proposed. Then the primary and secondary inductance（ Lp,Ls） and mutual inductance（ M） are calculated. Based on these formulas,the reluctance circuit structure could be optimized,and the results well agreed with that of Ansys Maxwell,which confirms the magnetic reluctance circuit and the physical character obtained is correct. Furthermore,based on this magnetic reluctance circuit,the trapezoidal windings section of contactless transformer is proposed to improve k and the turn of windings are optimized to enhance the output power. With these optimizations,k reached 0. 45 and efficiency of 85. 3% was achieved with the air gap of 48 mm in 30 k W IPT system experimental platform.
作者
徐罗那
杜玉梅
史黎明
XU Luo-na;DU Yu-mei;SHI Li-ming(Key Laboratory of Power Electronics and Electric Drive,Institute of Electrical Engineering,ChineseAcademy of Sciences,Beijing 100190,China;School of Electronic,Electrical and CommunicationEngineering,University of Chinese Academy of Sciences, Beijing 100049,China)
出处
《电工电能新技术》
CSCD
北大核心
2018年第1期15-22,共8页
Advanced Technology of Electrical Engineering and Energy
基金
国家“十二五”科技支撑计划项目(2013BAG19B00-04-01)
关键词
非接触变压器
磁路模型
绕组截面
耦合系数
contactless transformer
magnetic circuit model
windings cross section
coupling coefficient
