An Overview on Passive Magnetic Bearings

Timothy Slininger, W. Chan, E. Severson, B. Jawdat
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Abstract

Magnetic bearings are an area of interest for high speed applications, such as flywheel energy storage systems, to remove friction losses. Stable levitation cannot be achieved through a static passive magnetic bearing system, as indicated by Earnshaw's Theorem. Solutions using active magnetic bearings have been presented which achieve stable levitation, but induce losses in the current used to actively stabilize one or more degrees of freedom. To overcome these losses while retaining stable operation a fully passive architecture can be created utilizing superconducting magnetic bearings. This paper will review the key passive magnetic and superconducting technologies, their design and optimizations methods for different topologies, and existing work done to combine both into a functional stable system.
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被动磁轴承综述
磁轴承是高速应用的一个感兴趣的领域,如飞轮储能系统,以消除摩擦损失。根据恩肖定理,通过静态被动磁轴承系统无法实现稳定的悬浮。已经提出了利用主动磁轴承实现稳定悬浮的解决方案,但在用于主动稳定一个或多个自由度的电流中会产生损耗。为了克服这些损失,同时保持稳定的运行,可以利用超导磁轴承创建一个完全被动的结构。本文将回顾关键的无源磁性和超导技术,针对不同拓扑结构的设计和优化方法,以及将两者结合成一个功能稳定的系统所做的现有工作。
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