António J. Arsénio Costa, João F. P. Fernandes, P. J. Costa Branco
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引用次数: 0
摘要
本文分析了采用先前研究过的拓扑结构被动增强水平轴径向悬浮被动磁轴承(PMB)轴向刚度的不同解决方案的可行性。与采用场冷却(FC)技术的轴承相比,高温超导体(HTS)大块的零场冷却(ZFC)技术能产生更高的磁推力和悬浮力,电磁损耗也更低,但另一方面,其导向稳定性却远低于采用 FC 技术的轴承。由于稳定性的原因,大多数超导磁悬浮系统都采用 FC 技术。本研究小组的研究方向是开发一种水平轴 HTS ZFC 径向悬浮 PMB,这种 PMB 具有显著的悬浮力和较低的电磁损耗,其拓扑结构可确保导向稳定性。以往的工作表明,优化轴承几何结构以最大限度地提高磁导向力,可能不足以保证许多应用所需的轴向刚度。首先,我们评估了通过增加定子中 HTS 磁块的数量来增强导向力的程度。然后,评估了通过被动添加两个限制永磁环来增强轴向刚度的情况。结果表明,在不增加大量投资的情况下,通过增加限制永磁环,轴向刚度得到了极大增强。这一变化使得所研究的 ZFC 超导 PMB 能够应用于高精度轴向稳定性领域,如精密陀螺仪、水平轴螺旋桨和涡轮机。
Axial Stiffness Augmentation by adding Superconductor Bulks or Limiting Permanent Magnet Rings to a Horizontal Axis Zero-Field Cooled High-Tc Radial Passive Superconducting Bearing
This paper analyzes the viability of different solutions to passively augment the axial stiffness of a horizontal axis radial levitation passive magnetic bearing (PMB) with a previously studied topology. The zero-field cooling (ZFC) of high-temperature superconductor (HTS) bulks promotes higher magnetic impulsion and levitation forces and lower electromagnetic losses than those with field-cooling (FC) but, on the other hand, the guiding stability is much lower than those with FC. Because of stability reasons, FC was adopted in most superconducting maglev systems. The trend of this research group has been to develop a horizontal axis HTS ZFC radial levitation PMB presenting notable levitation forces with reduced electromagnetic losses, defined by a topology that creates guiding stability. Previous work has shown that optimizing the bearing geometry to maximize magnetic guidance forces might not be enough to guarantee the axial stiffness required for many applications. First, the extent to which guidance forces are augmented by increasing the number of HTS bulks in the stator is evaluated. Then, the axial stiffness augmentation by passively adding two limiting permanent magnet (PM) rings is evaluated. The results show that the axial stiffness is highly augmented by adding limiting PM rings with no significant additional investment. This change enables the use of the studied ZFC superconducting PMB in high-precision axial stability applications, such as precision gyroscopes, horizontal axis propellers, and turbines.
期刊介绍:
Actuators (ISSN 2076-0825; CODEN: ACTUC3) is an international open access journal on the science and technology of actuators and control systems published quarterly online by MDPI.