Calculation and Measurement of the Magnetic Field of Nd2Fe14B Magnets for High-Temperature Superconducting Magnetic Bearing Rotor

2019 ◽  
Vol 33 (4) ◽  
pp. 931-940
Author(s):  
Yincai Zou ◽  
Xing Bian ◽  
Jin Shang ◽  
Xiang Guan ◽  
Jihao Wu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Magnetic Bearing ◽  
High Temperature Superconducting ◽  
The Magnetic Field ◽  
Superconducting Magnetic Bearing

scholarly journals Improving homogeneity of the magnetic field by a high-temperature superconducting shield

2014 ◽  
Vol 507 (3) ◽  
pp. 032028 ◽  
Author(s):  
E Kulikov ◽  
N Agapov ◽  
V Drobin ◽  
A Smirnov ◽  
G Trubnikov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
High Temperature Superconducting ◽  
Superconducting Shield ◽  
The Magnetic Field

scholarly journals Magnetic Field Saturation of Non-Insulation High-Temperature Superconducting Coils during Overcurrent

Electronics ◽  
2021 ◽  
Vol 10 (22) ◽  
pp. 2789
Author(s):  
Wei Wu ◽  
Yusong Gao ◽  
Zhijian Jin
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Hot Spot ◽  
Axial Direction ◽  
Load Factor ◽  
Field Calculation ◽  
High Temperature Superconducting ◽  
Superconducting Coils ◽  
The Magnetic Field ◽  
Double Pancake

Non-insulation high-temperature superconducting coils provide a much lower risk of burnout in fault/abnormal conditions, such as hot-spot quench and overcurrent. This study employs an equivalent circuit grid model, coupled with magnetic field calculation and the E–J power law of superconductors, to deeply and systematically investigate the overcurrent charging process in a double-pancake non-insulation coil. An evident saturation of the magnetic field in the axial direction of the coil was observed and verified by experiments. Experimentally, the entire process, including the behavior of the magnetic field, was consistent with the numerical results. Based on the verified model, two main points were addressed: (1) Transient current distribution inside the coil during overcurrent charging was studied. Potential quenching risks were found to be at the innermost and outermost turn near the electrodes, as well as the pancake-to-pancake connection part. (2) Magnetic field saturation, which is a unique phenomenon in non-insulation superconducting coils during overcurrent charging, was studied in detail and first quantitatively defined by a new concept “converged load factor”. Its relationship with turn-to-turn resistivity was revealed.

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