A superconducting magnetic bearing (SMB) composed of a high-temperature superconductor (HTS) and permanent magnets (PMs) is simple and easy in use since it is not necessary to supply a source of electricity for excitation windings. However, the SMB is restricted in the load capacity because of the limitation of the magnetization strength of the PM. Thus, it is a very important problem to improve the load capacity of the SMB.
Jo Ju Hak, a post-graduate student of the Faculty of Physical Engineering, has determined a suitable direction of the magnetization of ring-type PMs that brings about the maximum levitation force in a four-surface levitation superconducting magnetic bearing (FSL-SMB) composed of a ring-type HTS bulk and six ring-type PMs.
The simulation results show that the maximum levitation force is generated only when the upper part of PMs is combined with opposite polarity. In this case, the outer radius of inner PMs at the top and bottom sides of the ring-type HTS bulk is about 32.5mm.
The FSL-SMB with opposite polarity will contribute to the improvement of the performance of SMBs consisting of HTS bulk and superconducting magnetic bearings.
You can find the details in his paper “Analysis on magnetization arrangements of ring-type permanent magnets in four surface levitation superconducting magnetic bearing” in “Engineering Research Express” (SCI).
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