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

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, N-N 相对式排列改进后能够提升磁通泵的开路电压; 改进式 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. 最后, 对永磁体宽度进行了参数化扫描来分析永磁体尺寸对开路电压的影响. 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.

Simulation of N-N Relative Arrangement of Permanent Magnets to Raise Open-circuit Voltage of Dynamo-type High-Tc Superconducting Flux Pump

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. Finally, the influence of PM size on Voc is analyzed by parametric scanning of PM width. 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.