超导磁力轴承悬浮力的有限元分析

【作者】 纪德志；

【导师】 祝长生；

【作者基本信息】 浙江大学 ， 电机与电器， 2007， 硕士

【摘要】 由第二类高温超导体与永磁体构成的高温超导磁力轴承(High TemperatureSuperconducting Magnetic Bearing,HTSMB)是一种利用电磁力将转子悬于空中,使转子和定子之间实现无机械接触的一种新型轴承。它是一个稳定系统,在无需控制的情况下就可实现稳定的悬浮,在工业上有一定的应用前景。本文在电磁场理论以及超导材料临界态模型的基础上,基于商业有限元软件ANSYS,利用VB工具开发了超导磁力轴承悬浮力特性的有限元分析系统,并对超导磁力轴承的静态悬浮力特性进行了分析,得到了包括磁场强度、磁力线分布、悬浮力等参数,讨论了轴承的不同结构以及结构参数对轴承悬浮力特性的影响。悬浮力是永磁体与超导体之间间隙的函数,悬浮力的大小与超导磁力轴承的结构有着密切的关系。对于超导推力轴承,悬浮力与推力轴承的结构存在一个最佳匹配关系,当永磁体的直径或宽度与超导体的直径相当时,推力轴承的悬浮力最大。在超导径向轴承中,沿轴向方向的悬浮力与超导体在轴向上的位移有关,径向悬浮力与定、转子在径向方向上的相对位置有关。计算发现,当永磁体与超导体之间间隙相等时,永磁体接近超导体时的悬浮力要比永磁体离开超导时的悬浮力大。更多还原

【Abstract】 A high temperature superconducting magnetic bearing, constructed by high temperature superconductors and permanent magnetic material, is a new kind of bearing, which is untouched between it’s stators and rotors. Since it is a stable system and doesn’t need controllers, so the high-temperature superconducting magnetic bearing is used in some rotating machinery.Based on the electromagnetic field theory and the critical state model of high-temperature superconductor material, an analysis system for the high-temperature superconducting bearings using VB language on commercial FEM soft ANSYS, is developed in this paper. The static characteristics of the high temperature superconducting bearing are analysed and the flux density vector, magnetic field intensity and levitation force are obtained. The effect of bearing’s type and bearing’s structure parameters on the characteristics of the high temperature superconducting bearings is discussed.Levitation force is a function of distance between permanent magnet and superconductor, which is related with the bearing’s construction. For a thrust superconducting magnetic bearing, the levitation force is the largest when permanent magnet’s diameter or width approximates superconductor’s diameter. For a radial superconducting magnetic bearing, axial levitation force is correlative to superconductor’s axial displacement and radial levitation force is correlative to the radial displacement between the stator and the rotator. Results show that at the same distance between permanent magnet and superconductor, the levitation force is larger when the permanent magnet is approaching to superconductor than that when the permanent magnet is leaving superconductor.更多还原