Optimizing superconducting magnetic bearings of HTS flywheel systems based on 3D H-ϕ formulation

IF 1.8 3区 工程技术 Q3 PHYSICS, APPLIED
Wenhao Li , Dongxu Wang , Sisi Peng , Zigang Deng , Difan Zhou , Chuanbing Cai
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引用次数: 0

Abstract

The superconducting flywheel system exploiting the magnetic coupling between the bulk high temperature superconductors (HTSs) and permanent magnets (PMs) exhibits excellent performance of self-stable levitation, and is promising for power applications. In this paper, we use the H-ϕ formulation combined with moving mesh to establish a full 3D model for the thrust type and journal type bearings in the HTS flywheel system. We then proposed different Halbach schemes to enhance the magnetic flux density of the rotor and thus the coupling, and investigated the levitation force, relaxation characteristics, electromagnetic transient distribution, and temperature characteristics of the bearings. Results show that, under axial zero field-cooled (ZFC) condition, the optimized PM rotor scheme can significantly improve the maximum levitation force and stiffness by 4.0 and 2.3 times respectively for the thrust type bearing, and the maximum levitation force of journal type bearing can be improved by a factor of 5.5. Under the radial ZFC condition, the maximum levitation force and stiffness of the journal type bearing have been increased by 4.9 times and 2.9 times. For the relaxation of both bearings during operation, the optimized PM rotors lead to relatively greater attenuation of levitation force. The proximity of the optimized PM rotors intensifies the magnetic flux movement of the HTS bulks but only brings about a limited temperature rise, and the superconductors still maintain a good low-temperature working environment. This study provides an effective methodology for analyzing the HTS bearing systems and good references for the optimal design of compact HTS flywheel energy storage systems (FESSs).

基于 3D H-ϕ 配方优化 HTS 飞轮系统的超导磁性轴承
超导飞轮系统利用块体高温超导体(HTS)和永磁体(PM)之间的磁耦合,表现出优异的自稳悬浮性能,在电力应用中大有可为。在本文中,我们使用 H-ϕ 公式结合移动网格建立了 HTS 飞轮系统中推力型和轴颈型轴承的全三维模型。然后,我们提出了不同的哈尔巴赫方案来增强转子的磁通密度,从而提高耦合度,并研究了轴承的悬浮力、弛豫特性、电磁瞬态分布和温度特性。结果表明,在轴向零场冷(ZFC)条件下,优化的永磁转子方案可显著提高推力型轴承的最大悬浮力和刚度,分别提高 4.0 倍和 2.3 倍,而轴颈型轴承的最大悬浮力可提高 5.5 倍。在径向 ZFC 条件下,轴颈型轴承的最大浮力和刚度分别提高了 4.9 倍和 2.9 倍。对于两个轴承在运行过程中的松弛情况,优化的 PM 转子会导致相对更大的浮力衰减。优化永磁转子的靠近加强了 HTS 体块的磁通运动,但只带来了有限的温升,超导体仍能保持良好的低温工作环境。这项研究为分析 HTS 轴承系统提供了有效的方法,并为紧凑型 HTS 飞轮储能系统(FESS)的优化设计提供了良好的参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Cryogenics
Cryogenics 物理-热力学
CiteScore
3.80
自引率
9.50%
发文量
0
审稿时长
2.1 months
期刊介绍: Cryogenics is the world''s leading journal focusing on all aspects of cryoengineering and cryogenics. Papers published in Cryogenics cover a wide variety of subjects in low temperature engineering and research. Among the areas covered are: - Applications of superconductivity: magnets, electronics, devices - Superconductors and their properties - Properties of materials: metals, alloys, composites, polymers, insulations - New applications of cryogenic technology to processes, devices, machinery - Refrigeration and liquefaction technology - Thermodynamics - Fluid properties and fluid mechanics - Heat transfer - Thermometry and measurement science - Cryogenics in medicine - Cryoelectronics
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