Waveform Control Pulse Magnetization for HTS Bulk With Flux Jump
Waveform Control Pulse Magnetization for HTS Bulk With Flux Jump
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具有磁通跳变的 HTS Bulk 波形控制脉冲磁化
DOI：
10.1109/tasc.2018.2816099
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发表时间：
2018
影响因子：
1.8
通讯作者：
Izumi Mitsuru
中科院分区：
文献类型：
--
作者：
Ida Tetsuya;Li Zhi;Miki Motohiro;Watasaki Masahiro;Izumi Mitsuru
为了在高温超导同步电机中以更少的次数将强磁场俘获到多个块体中，我们改进了单脉冲磁化的性能。在所提出的波形控制脉冲磁化（WCPM）方法，一个单一的脉冲磁场可以有效地磁化高温超导体块。在本研究中，我们在77 K下使用无铁芯的分裂式铜线圈，用WCPM磁化Gd-Ba-Cu-O高温超导块材。将WCPM中的预定占空比从40%提高到45%，脉冲磁场磁化（PFM）引起的高温超导体磁通跳跃，俘获磁通密度大大增加。占空比为50%的WCPM可以达到比传统PFM高150%的捕获磁通密度。我们总是观察到通量跳跃超过1.7 T的这种散装，而使用PFM。当我们尝试WCPM的磁通密度略高于所观察到的磁通跳跃作为控制目标进行抑制，高温超导体捕获的高磁通密度相媲美的场冷却方法，只有通过施加一个单脉冲磁场。该块体通过反馈控制成功地捕获了传统单PFM难以实现的高磁通密度，并具有来自WCPM的低能量损耗。通过精细地利用PFM中的磁通跳跃阱，证明了高温超导块材可以捕获强磁场。
We improved the performance of single pulse magnetization in order to trap high magnetic field to many bulks in the high-temperature superconducting (HTS) synchronous motor with less number of times. In the proposed waveform control pulse magnetization (WCPM) method, a single pulse magnetic field may effectively magnetize the HTS bulk. In this study, we magnetized Gd-Ba-Cu-O HTS bulk by the WCPM at 77 K using the split-type copper coils without a core. Increasing the predetermined duty ratio in WCPM from 40% to 45%, HTS bulk caused flux jump by pulse field magnetization (PFM), and trapped magnetic flux density greatly increased. WCPM with 50% duty ratio allowed to reach a trapped magnetic flux density 150% higher than the conventional PFM. We always observed flux jumps over 1.7 T for this bulk while using PFM. When we attempted WCPM with the magnetic flux density slightly higher than the observed flux jump as control target for suppressing, the HTS bulk trapped a high magnetic flux density comparable to the field cooling method, only by applying a single-pulsed magnetic field. This bulk successfully trapped high magnetic flux density difficult to realize with the conventional single PFM with low energy loss from the WCPM through feedback control. By finely using flux jump well in PFM, it was shown that the HTS bulk can trap high magnetic field.