【作者】 张江华；

【导师】 曾佑文；

【作者基本信息】 西南交通大学 ， 电工理论与新技术， 2007， 硕士

【摘要】 高温超导材料被发现之后，随着其制备工艺的不断改善，超导性能不断提高，在众多领域得到广泛应用。由于高温超导体所具有的磁通钉扎特性，使其能够稳定悬浮于永磁体之上，并且不需要复杂的控制系统，因此被应用到磁悬浮系统之中，而高温超导磁悬浮轴承则是其中最重要的应用之一。它作为磁悬浮轴承中的一种，由于其所具有的无接触、无摩擦、使用寿命长以及结构简单等特性被广泛关注。首先在绪论中描述了磁悬浮轴承的结构和特性，并对发展现状和应用前景作了介绍。对高温超导磁悬浮轴承来说，其中最重要的参数包括悬浮力和悬浮刚度等，本论文基于临界态模型和电流矢量位，采用有限单元法对超导体内的电流分布进行分析、求解，根据洛仑兹力公式进而得到悬浮力和悬浮刚度等重要参数。在此基础上，开发了方便、快捷的应用程序，并且利用该程序研究了各种参数对悬浮特性的影响，这些参数包括：永磁体几何尺寸、超导体几何尺寸、超导体的临界电流密度以及运动位置等。利用高温超导磁悬浮测试系统对计算结果进行验证，证明了该模型和程序在研究高温超导磁悬浮系统悬浮特性时的可行性。利用该程序，对多种结构和尺寸参数的高温超导磁悬浮轴承进行了计算，得到了悬浮力与位移曲线以及电流分布图像等，为高温超导磁悬浮轴承的设计和优化提供理论基础。更多还原

【Abstract】 The applications of the high temperature superconductor (HTS) become promising due to development of the manufacturing process and improvement of superconducting properties.Because of the flux pinning properties of the HTSs,the superconductors can be levitated stably on the permanent magnets (PM) ,which are entirely passive and do not require any active control systems. The high temperature superconductors were applied to the magntic systems;for example, the high temperature superconducting magnetic bearings,as a kind of magnetic bearings,have the properties of no contact,no friction ,long life and simple structure etc.So the HTS magnetic bearing has been a subject of considerable interest for the last decade all over the world.First the structure and properties of magnetic bearings are depicted,and the development status and future application are introduced in the introduction.The most important parameters of the HST bearings were the levitation force and stiffness.Based on the critical state model and current vector potential,the electric current distribution were calculated by the finite element method(FEM),then the force and stiffness can be computed by the Lorentz formula.A convenient application software which can be used to calculate the force of HTS bearings was developed by author.The parameters which influenced the bearing system were researched by the software.The parameters include the dimensions of the PMs and HTSs,the critical current density and the positions.Results calculated by the software were compared with the experimental results, and the simulated results and experimental ones correspond to each other. Several HTS axial bearings which had different structures and dimensions were simulated by the software, and got the force and current distribution which can be the theoretic foundation of the design and optimize of the HTS bearings.更多还原