磁耦合谐振式无线电能传输系统线圈的电磁分析与优化设计

发布时间：2018-05-28 02:34

本文选题：磁耦合谐振 + 无线电能传输　；参考：《北京交通大学》2017年硕士论文

【摘要】：近年来,无线电能传输(WPT)技术不断发展,逐渐成为国内外学术界关注的热点技术。作为无线电能传输技术发展的新方向,磁耦合谐振式WPT技术具有可实现中远距离电能传输、效率高、辐射小和非磁性物体对系统影响小等特点。磁耦合谐振式WPT技术在便携式电子设备、智能家居以及电动汽车等轨道交通领域都有广阔的应用前景。目前,国内外专家学者已经针对磁耦合谐振式WPT技术展开研究,并取得一定成果,但有些问题尚未进行系统性研究。例如,磁耦合谐振式WPT系统在移动状态下,线圈的电磁分析和优化设计。本文正是基于这个问题进行研究分析,磁耦合线圈的设计直接影响WPT的性能,是WPT系统研究的核心内容。以电动汽车为例,首先分析磁耦合谐振式WPT系统结构和电能传输过程。然后采用互感模型理论,建立等效电路模型,并通过Maxwell仿真进行电磁分析。最后以提高系统效率,增强抗偏移能力,降低系统辐射为目标对线圈进行优化设计。本文的主要研究工作如下:(1)采用互感理论模型分析WPT过程,对比分析选择串联-串联谐振补偿结构,建立系统等效电路模型,在此基础上分析功率效率特性、频率特性、距离特性和方向特性这四个基本特性。(2)耦合线圈的优化设计以提高系统传输效率、增强抗偏移能力和降低辐射为优化目标。在已有模型基础上,通过Matlab仿真计算效率等参数最优值,优化设计线圈参数。优化设计主要是针对耦合线圈参数和结构进行优化。结构优化包括对比分析选择抗偏移能力好的矩形平面螺旋结构作为耦合线圈结构,加入平面磁芯结构提高耦合系数。(3)通过Maxwell仿真软件,对WPT过程中耦合线圈抗偏移能力进行电磁仿真和分析,得到线圈最优传输距离和平面磁芯结构最优位置。(4)根据优化后参数计算可得耦合线圈实体模型参数,绕制耦合线圈,搭建系统实验平台,对优化后线圈进行实验分析。实验可得优化后线圈系统传输效率提高12%,抗偏移能力最大可提高57.6%。本文的研究不仅研究了磁耦合谐振式WPT系统在移动状态下的电磁分布,而且对磁耦合线圈进行了优化设计。本文的研究成果为无线充电过程中存在位置偏移导致效率降低的问题提供解决思路,为便携式电子产品和电动汽车无线充电的应用提供理论基础。
[Abstract]:In recent years, wireless energy transmission (WPTT) technology has been developing, and has gradually become a hot topic in academic circles at home and abroad. As a new direction in the development of radio energy transmission technology, the magnetically coupled resonant WPT technology has the characteristics of medium and long distance power transmission, high efficiency, small radiation and small influence of non-magnetic objects on the system. Magnetic coupling resonant WPT technology has a wide application prospect in portable electronic devices, smart home and electric vehicles and other rail transit fields. At present, experts and scholars at home and abroad have carried out research on magnetically coupled resonance (WPT) technology, and some achievements have been made, but some problems have not been systematically studied. For example, the electromagnetic analysis and optimization design of magnetic coupling resonant WPT system in moving state. The design of magnetic coupling coil directly affects the performance of WPT and is the core of WPT system research. Taking electric vehicle as an example, the structure of magnetic coupling resonant WPT system and the process of electric power transmission are analyzed. Then, the equivalent circuit model is established by using mutual inductance model theory, and electromagnetic analysis is carried out by Maxwell simulation. Finally, the coil is optimized to improve system efficiency, enhance anti-migration ability and reduce system radiation. The main work of this paper is as follows: (1) the WPT process is analyzed by using the mutual inductance theory model, the series resonant compensation structure is compared and the equivalent circuit model of the system is established. On this basis, the power efficiency characteristics and frequency characteristics are analyzed. The optimization design of the coupling coil is to improve the transmission efficiency, enhance the anti-migration ability and reduce the radiation. Based on the existing models, the parameters of coil are optimized by Matlab simulation. The optimization design is mainly aimed at the optimization of the coupling coil parameters and structure. Structural optimization includes comparative analysis of rectangular planar helical structure with good anti-migration ability as coupling coil structure and adding planar magnetic core structure to increase coupling coefficient by Maxwell simulation software. Through electromagnetic simulation and analysis of the anti-offset ability of coupling coil in WPT process, the optimal transmission distance of coil and the optimal position of planar core structure are obtained. The solid model parameters of coupling coil can be calculated according to the optimized parameters, and the coupling coil can be wound. The system experiment platform is built and the optimized coil is analyzed experimentally. The experimental results show that the transmission efficiency of the coil system is improved by 12 and the maximum anti-offset ability is increased by 57.6 percent. In this paper, not only the electromagnetic distribution of the magnetically coupled resonant WPT system under moving state is studied, but also the optimization design of the magnetically coupled coil is carried out. The research results in this paper provide a theoretical basis for the application of wireless charging of portable electronic products and electric vehicles.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM724

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