【作者】 朱勇；

【导师】 李永明；

【作者基本信息】 重庆大学 ， 工程硕士（电气工程领域）（专业学位）， 2016， 硕士

【摘要】 随着环境恶化和能源危急,电动汽车凭借其得天独厚的优势成为人们研究的一大热点。近年来电动汽车发展迅速并得到日益普及,但仍有一些问题阻碍了电动汽车的进一步发展和推广,其中充电问题一直是一大难题。传统的电动汽车充电多采用插电式,这种充电方法容易受到天气的影响还会造成漏电,同时也不方便。无线充电的出现能够很好弥补这些缺点,这种方式更加方便和灵活,操作性也更强,因此无线充电的方式具有很高的研究价值和应用推广意义。电动汽车无线充电主要采用电磁感应式和磁耦合谐振式两种方式。早在十几年前人们便对电磁感应式的充电方式展开研究,在MIT的研究团队于2007年提出磁耦合谐振的无线电能传输技术以后,人们便将注意力转移到磁耦合谐振的无线电能传输研究中。在这短短的十年时间内,磁耦合谐振式无线电能传输便得到迅速发展,其中电动汽车无线充电便是其中一大研究热点。本文结合国家自然科学基金项目“磁谐振式无线电能传输特性及其空间电磁场对人体的影响研究”(批准号:51477014),主要进行了以下工作的研究:(1)针对磁耦合谐振的四种补偿方式进行对比分析,根据传输能力进行对比,最终确定了串串补偿的方式。(2)在串串补偿的基础上对电动汽车无线充电系统进行建模,利用有限元仿真软件分析了系统的传输功率和效率,并从电磁场的角度出发,分析了线圈周围的电磁场分布特性,并从电磁能量和磁力线的分析中进一步验证了系统的传输能力,最终系统的输出功率为3790.81W,效率可达87.53%,系统满足SAE规定的功率和效率等级要求,实际中可以实现。(3)在上述无线充电系统的基础上,进一步分析了其电磁安全性。首先分别建立了三维人体模型和整车有限元模型,分别仿真分析了人体直接暴露在谐振系统下和整车充电条件下人体关键组织的电磁吸收情况,并与ICNIRP导出准则以及我国国标进行对比,对其电磁安全性做出评价。更多还原

【Abstract】 With the degradation of the environment and the aggravation of the energy crisis,electric vehicle has become a research hotspot becauseof its exceptional advantages. But the transfer of electric power is a key factor which hinders its development. Most of the electric vehicles still need to be plugged in for recharging. This way of charging can not only be affected by the weather easily but also inconvenient. The emergence of wireless charging can overcome these shortcomings, this kind of charging is more convenient,flexible and available. So the study for wireless charging method is much valuable, and application is more significant.The wireless power transfer for electric vehicles mainly based on two types—electromagnetic induction and Magnetic resonant coupling. People started to do research on the way of power transfer which based on electromagnetic induction more than a decade ago. Since the research group in MIT proposed wireless power transfer techniques based on magnetic resonances in 2007, more attention has been shifted to the research of the wireless power transfer based on magnetic resonant coupling. In just ten years, wireless power transfer based on magnetic resonant coupling has been developed rapidly.This paper supported by the Natural Science Fund Project " Study on the transmission characteristics and the spatial magnetic field effects on the human body to magnetic resonance type radio "(51477014),the researcher mainly conducted the following studies:(1) Though the comparison and analysis of four methods of compensation on magnetic resonant coupling from the view point of transmission capability, the method of series compensation is finally defined.(2) Modeled the wireless power transfer system of electric vehicle based on series compensation. Using the finite element simulation software to analyze the transmission power and efficiency. From the aspect of electromagnetic fields, the paper introduces the electromagnetic distribution that surround coils, and found further evidence in the analysis of electromagnetic energy and magnetic field lines to support the energy transmission capability in the system. The output power of the system is 3790.81 W,and efficiency up to 87.53% in the end. The system meets the requirements of the power and efficiency level of SAE, and can be realized in practice.(3) On the basis of the above wireless power transfer system, the paper further analyzes the electromagnetic security. The researcher constructed 3D body model and finite element model of complete vehicles separately, then simulated and analyzed the electromagnetic absorption of human organs when human exposure to the resonant system and vehicle charging system. Compared with the ICNIRP derived standards and national standard of China, the author evaluated the electromagnetic safety of the system.更多还原