【作者】 陈鑫；

【导师】 晏飞翔；

【作者基本信息】 西南交通大学 ， 交通信息工程及控制， 2013， 硕士

【摘要】 当前的运输行业大多数直线电动驱动器是传统铜线圈及铁磁芯组成的,这样以便于提高运行速度。然而,这种结构的直线电机仍然存在一些不足之处：无论是同步电机还是感应电机,短定子或是长定子直线电机,铁磁芯的饱和最终会限制最高推进力。目前大多数对直线电机研究的目的在获取更大的推进力和更高的推力密度之上,其主要从线圈参数、绕组、安放位置和几何图形等关键组成部分上进行相关优化。相比而言,本论文提出了一种想法来获得更高的推进力密度。本文主要研究的直线感应电机初级是传统的由三相铜绕组绕制而成的单边扁平型硅钢电枢,次级是由多达四个二代YBCO涂层导体绕制而成的超导圈体,为了比较推进力数据,线圈内部的铁磁材料由铁和铁钴钒合金组成。首先,本论文对直线感应电机超导次级线圈进行了计算设计,并且在加工组装后,开展了相应的实验测试和数据分析。其次,在直线感应电机采用超导次级锁定状态下,考虑到次级在液氮温度下接近零电阻时的超导特性,超导线圈回路利用初级电枢产生的行波磁场感应出电流,从而产生推进力,实现系统推进。根据实验结果,测得最大推力为120N,相当于123.45N/m2的推进力密度,这个数值比铜线绕组好123倍,测量到的滑差和推进力曲线与传统的直线电机不一样,原因在于第二类超导体内部有电容成分。借助该实验结果验证了一个事实：此系统缔造的推进力密度已远远超过目前传统直线电机推进力密度技术上的限制,并且可能打破目前581km/h的地面速度记录,因此这个研究很有意义。更多还原

【Abstract】 Most electric linear drives in the transportation industry nowadays are made of conventional copper wire coils along with the possible aid of ferromagnetic cores. High speeds can be conveniently obtained; however, some drawbacks still remain. The main shortfall of a linear motor, whether it be synchronous or inductive, short stator or long stator, is the magnetic saturation of its ferromagnetic cores which ultimately saturates generation of thrust. Most research has been devoted toward reaching higher and higher thrust densities; however, they mostly aim toward the optimization of its key components such as its coil parameters, winding, positioning and geometry. In contrast, this work focuses on a new concept so that higher thrust densities can be obtained.This work presents the design, construction, computing, experimental testing and data analysis of a linear induction motor that employs a superconducting secondary in the locked-mover state. Given the near zero resistance superconducting properties of the secondary, large amounts of current are able to be induced which are harnessed to generate thrust. The primary of the studied linear motor is a conventional flat, single sided and three-phased made of copper wound coils and a silicon steel armature. The secondary also uses a flat geometry consisting of up to four coils made of2nd generation YBCO coated conductor wire connected in series. Ferromagnetic materials made of iron and Permendur50were also used as cores of the superconducting coils for comparison.The obtained experimental results were better than expected; a maximum thrust of120N was achieved, which was equivalent to a thrust density of123.45N/m, or123x times better than its copper wound counterpart. The slip versus thrust curve was measured to be different than conventional linear motors which Ⅰ explain it by taking into account the capacitive component inherent in Type-Ⅱ superconductors. The evidence obtained from the experiments establish the fact that with the aid of superconducting components, the present thrust density limit in linear motor technology can be far surpassed allowing for the possibility of breaking the present ground speed record of581km/h.更多还原