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Magnetic levitation using a stack of high temperature superconducting tape annuli

机译:使用一叠高温超导带环进行磁悬浮

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摘要

Stacks of large width superconducting tape can carry persistent currents over similar length scales to bulk superconductors, therefore giving them potential for trapped field magnets and magnetic levitation. 46 mm wide high temperature superconducting tape has previously been cut into square annuli to create a 3.5 T persistent mode magnet. The same tape pieces were used here to form a composite bulk hollow cylinder with an inner bore of 26 mm. Magnetic levitation was achieved by field cooling with a pair of rare-earth magnets. This paper reports the axial levitation force properties of the stack of annuli, showing that the same axial forces expected for a uniform bulk cylinder of infinite $extit{J c}$ can be generated at 20 K. Levitation forces up to 550 N were measured between the rare-earth magnets and stack. Finite element modelling in COMSOL Multiphysics using the H-formulation was also performed including a full critical state model for induced currents, with temperature and field dependent properties as well as the influence of the ferromagnetic substrate which enhances the force. Spark erosion was used for the first time to machine the stack of tapes proving that large stacks can be easily machined to high geometric tolerance. The stack geometry tested is a possible candidate for a rotary superconducting bearing.
机译:大宽度超导带堆叠可以以类似的长度尺度将持续电流传递到块状超导体,因此使它们有可能被困在场磁体和磁悬浮中。先前已将46毫米宽的高温超导带切成方形环,以形成3.5 T的持久模式磁体。此处使用相同的胶带片形成内孔为26 mm的复合散装空心圆柱体。磁悬浮通过使用一对稀土磁体进行磁场冷却来实现。本文报道了环形堆垛的轴向悬浮力特性,表明在20 K时可以产生无限大 textit {J c} $的均匀大体积圆柱体的相同轴向力。最大悬浮力为550 N在稀土磁铁和烟囱之间测量。还使用H公式在COMSOL Multiphysics中进行了有限元建模,包括感应电流的完整临界状态模型,该模型具有与温度和场相关的特性以及铁磁性基板的影响,从而增强了力。火花腐蚀首次用于加工胶带叠层,事实证明可以轻松加工较大的叠层,以达到较高的几何公差。测试的叠层几何形状可能是旋转超导轴承的候选材料。

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