A study of hybrid magnetic bearings for rlexible fotor using Passive and Active types

迄今为止，关于磁悬浮轴承的研究已经很多。这些磁力轴承已用于太空等特殊领域。然而，磁轴承的需求正在增长，它一直试图将磁轴承应用于工业重型转子。由于大电流线圈和线圈冷却等原因，不容易应用于大而重的转子。本研究针对上述原因，提出被动磁轴承（永磁体）与主动磁轴承（电磁体）的混合磁轴承。特别是采用了最大被动磁轴承和最小主动磁轴承，并对混合磁轴承进行了设计、制造和动态性能分析。最后，对悬浮进行了实验研究，研究分为两类。一种是仅使用永磁体的推力磁轴承，另一种是被动和主动型的径向磁轴承。径向磁轴承被称为零功率磁轴承。也就是说，偏置电流被永久磁铁取代。这些零功率磁轴承已实际实现在这项研究中。采用零功率磁悬浮轴承实现了柔性转子的高稳定悬浮。

There are many studies concerning magnetic bearings up to now. These magnetic bearings have been used for special field such as space. However, the needs of magnetic bearings is growing up and it has been trying to apply magnetic bearings for industrial heavy rotors. It is not easy to apply to large and heavy rotors because of big current coils and cooling of coils, etc.This study proposes the hybrid magnetic bearings with passive magnetic bearings (permanent magnets) and active magnetic bearings (electromagnets) for the above mentioned reasons. In particular, The maximum passive magnetic bearings and the minimum active magnetic bearings are used and the hybrid magnetic bearings have been designed, manufactured, analyzed for dynamic performance. Finally, the experimental study of levitation has been done.The study was into classified two types. One is the thrust magnetic bearings using only permanent magnets, The other is radial magnetic bearings with passive and active types. The radial magnetic bearings are so called zero-power magnetic bearings. Namely, the bias current is replaced with permanent magnts. These zero-powered magnetic bearings have been actually realized in this study. Also the flexible rotor has levitated with high stability using the zero-powered magnetic bearings.