Analysis on end-effect of radial HTS magnetic levitation bearing
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摘要:
针对径向高温超导磁悬浮轴承轴向尺寸有限引起的端部效应会影响其轴向悬浮特性,提出一种基于 H 公式的二维有 限元建模方法,对径向高温超导磁悬浮轴承的端部效应进行分析。 首先,通过实验测试验证提出的有限元建模方法;然后,分别 建立具有不同尺寸定、转子的径向高温超导磁悬浮轴承有限元模型;最后,得到不同尺寸的超导定子与不同极数的永磁转子下 轴向悬浮力与位移的关系。 结果表明,由于端部效应,随着超导定子分块数量的增加,轴向悬浮特性不断恶化;随着永磁转子极 数的增加,轴向悬浮力最大值先提高后降低,最终趋于永磁转子无限长时的轴向悬浮力最大值。
Abstract:
The end-effect of which is caused by the limited axial size of radial HTS magnetic bearing will affect axial levitation behavior of radial HTS magnetic bearing. A 2-D finite element modeling method based on H-formulation is proposed to analyze the end-effect of radial HTS magnetic bearing. Firstly, the proposed finite element modeling method is verified by experimental tests. Then, the finite element models of radial HTS magnetic bearings with different sizes of stator and rotor are established respectively. Finally, it is obtained that the relationship between axial levitation force and displacement of superconducting stator of different size and permanent magnet rotor with different number of poles. The results show that due to the end effect, the axial levitation behavior deteriorates with the increase of the number of superconducting stator bulks. Moreover, with the increase of the number of permanent magnet rotor poles, the maximum axial levitation force shows a trend from rise to decline and it eventually approaches the maximum axial levitation force of permanent magnet rotor for infinite length.
