In the practical application of high-temperature superconducting (HTS) magnetic levitation, the influence of ambient temperature on its performance is mainly reflected in the change of magnetic characteristics of the permanent magnet guideway (PMG). In order to investigate the magnetic characteristics of the PMG at high temperature and the influence of temperature on the levitation performance of HTS bulk above, we studied the magnetic characteristics of three kinds of PMG and six kinds of single permanent magnet (PM) in the temperature range from room temperature to 85 °C. Furthermore, we investigated the effect of this variation on the levitation performance of HTS bulk under a zero-field-cooling condition. The results show that the N-S-S-N-type PMG-H has better magnetic field stability than the Halbach PMG-I and the N-N-S-S-type PMG-J at high temperature. The levitation force of HTS bulks decreases with the increase of the PMG temperature. The variation range of levitation force is larger than that of magnetic field of PM, but absolute values under 55 °C are small. This work provides a reference for the engineering PMG optimization of HTS magnetic levitation.

中文翻译：

---

Nd-Fe-B永磁体高温磁特性及其对高温超导悬浮性能的影响

在高温超导（HTS）磁悬浮的实际应用中，环境温度对其性能的影响主要体现在永磁导轨（PMG）的磁特性变化上。为了研究PMG在高温下的磁特性以及温度对HTS块体悬浮性能的影响，我们研究了三种PMG和六种单一永磁体（PM）在高温下的磁特性范围从室温到 85 °C。此外，我们研究了这种变化对零场冷却条件下 HTS 体悬浮性能的影响。结果表明，NSSN型PMG-H在高温下具有比Halbach PMG-I和NNSS型PMG-J更好的磁场稳定性。HTS 块体的悬浮力随着 PMG 温度的升高而减小。悬浮力的变化范围大于PM磁场的变化范围，但55℃以下的绝对值很小。该工作为高温超导磁悬浮工程PMG优化提供了参考。