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永磁体N-N相对式排列提升旋转式高温超导磁通泵开路电压的仿真研究
宋世恒, 李文皓, 肖书良, 李敏娟, 周迪帆, 蔡传兵
0
(上海大学理学院物理系)
摘要:
旋转式高温超导磁通泵可以无接触地向超导线圈中注入直流电,在超导磁体充电方面具有独特的优势。在本文中,我们基于H-A方程耦合建立了一个磁通泵二维有限元模型,分别模拟了三块永磁体、五块永磁体在不同的排列方式下对磁通泵开路电压的影响。与正常的N极向下的排列方式相比,改进后的N-N相对式排列能够提升磁通泵的开路电压;改进后的Halbach排列对开路电压几乎没有影响。在50 Hz的旋转频率下,永磁体N-N相对式排列使开路电压提升13%。这是由于永磁体N-N相对式排列后,磁通将会被挤压,从而产生有多个峰值的磁感应强度分布,使等效电压波形从不对称的四重峰变为多重峰。通过优化磁体结构设计,可以控制磁感应强度分布,提升磁通泵的开路电压,为提升实验装置的输出性能提供一种新颖的设计方向。
关键词:  高温超导磁通泵,H-A耦合,N-N相对式排列,开路电压
DOI:
投稿时间:2023-04-06修订日期:2023-05-05
基金项目:中科院先导专项,国家自然科学基金,上海市科技创新计划,国家重点研发计划
Simulation of N-N Relative Arrangement of Permanent Magnets to Raise Open-Circuit Voltage of Dynamo-Type High-Tc Superconducting Flux Pump
Song shiheng, Li wenhao, Xiao shuliang, Li minjuan, Zhou difan, Cai chuanbing
(Shanghai Key Laboratory of High Temperature Superconductors,Department of Physics,Shanghai University)
Abstract:
The dynamo-type high-Tc superconducting (HTS) flux pump can inject direct current into the superconducting coil without contact, which has a unique advantage in superconducting magnet charging. In this paper, a two-dimensional finite element model of flux pump is established based on H-A equation coupling, and the influences of three permanent magnets (PMs) and five PMs on the open-circuit voltage (Voc) of flux pump under different arrangement modes are simulated respectively. Compared with the normal N-pole downward arrangement, the improved N-N relative arrangement can increase the Voc. The improved Halbach arrangement has little effect on the Voc. At a rotation frequency of 50 Hz, the N-N relative arrangement of PMs increases the Voc by 13%. This is because after the N-N relative arrangement of PMs, the magnetic flux will be squeezed, resulting in a magnetic induction intensity distribution with multiple peaks, so that the equivalent voltage waveform (Veq) changes from an asymmetric quadruple peak to a multiple peak. By optimizing the design of the magnet structure, the magnetic induction intensity distribution can be controlled and the Voc of the flux pump can be increased, which provides a novel design direction for improving the output performance of the experimental device.
Key words:  HTS flux pump, H-A coupling, N-N relative arrangement, open-circuit voltage

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