A Novel 3-DOF Axial Hybrid Magnetic Bearing
A Novel 3-DOF Axial Hybrid Magnetic Bearing
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DOI：
10.1109/tmag.2010.2074206
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发表时间：
2010-12-01
影响因子：
2.1
通讯作者：
Tang Jiqiang
中科院分区：
文献类型：
--
作者：
Fang Jiancheng;Sun Jinji;Tang Jiqiang
提出了一种新型永磁偏置轴向混合磁轴承结构。它有四段杆来控制三个自由度（3-DOF）。在传统轴向磁轴承内外气隙的基础上，在永磁体和定子磁极之间构造了一种新型的气隙，称为辅助气隙。该气隙将偏置磁通路径与控制磁通路径分开。结果，由于控制磁通路径的较低磁阻，可以实现轴向磁轴承的较低功率损耗。利用等效磁路法和三维有限元法对三自由度轴向混合磁轴承进行了分析和建模。实验结果表明，该轴向磁轴承具有良好的控制性能，且X、Y、Z三个方向之间的耦合较小。然而，由于四段定子极在推力板中产生交变磁通密度，在高速下旋转功率损失将很大。因此，我们提出了一种新的定子，命名为平行槽定子和新型推力板，以有效地减少旋转功率损失，这是由DT 4和纳米晶材料组装。同时，设计并组装了一台采用新型定子和止推板的轴向混合磁轴承样机，并将其应用于5 000 r/min、角动量为15 Nm的五自由度反作用飞轮系统中，实验结果验证了该方案的可行性。
In this paper, we propose a novel structure of permanent-magnet-biased axial hybrid magnetic bearing. It has four segments of poles to control three degrees of freedom (3-DOF). Based on the inner and outer air gaps in conventional axial magnetic bearings, a novel air gap, called the subsidiary air gap, is constructed between the permanent magnet and the stator poles. This air gap separates the bias flux paths from the control flux paths. As a result, lower power loss of the axial magnetic bearing can be achieved due to lower magnetic reluctance of the control flux paths. Furthermore, by means of the equivalent magnetic circuit method and the 3-D finite-element method (FEM), we analyze and model the 3-DOF axial hybrid magnetic bearing. Experimental results show that the presented axial magnetic bearing has good control performance and little coupling among X, Y, and Z directions. However, the rotational power loss will be large at high speed because of the alternating flux density in the thrust plate produced by four segments of stator poles. Therefore, we propose a novel stator, named the parallel-slot stator, and novel thrust plate to reduce the rotational power loss effectively, which is assembled by DT4 and nanocrystalline materials. Meanwhile, we have designed and assembled an axial hybrid magnetic bearing prototype with the novel stator and thrust plate, which is applied in the five-degrees-of-freedom reaction flywheel system with angular momentum of 15 Nms at 5000 r/min. It is validated by the experimental results.