Losses in a high-temperature superconductor exposed to AC and DC transport currents and magnetic fields

2001 ◽  
Vol 11 (1) ◽  
pp. 2635 ◽  
Author(s):  
N. Schonborg ◽  
S. Hornfeldt
Keyword(s):  
High Temperature ◽  
Magnetic Fields ◽  
High Temperature Superconductor

SHF absorption in low magnetic fields in Mn-V-Mo oxide systems: possible new type of high-temperature superconductor

1990 ◽  
Vol 148 (1-2) ◽  
pp. 119-121 ◽  
Author(s):  
B.V. Rozentuller ◽  
S.V. Stepanov ◽  
M.M. Shabarchina ◽  
A.I. Tsapin
Keyword(s):  
High Temperature ◽  
Magnetic Fields ◽  
High Temperature Superconductor ◽  
Oxide Systems ◽  
New Type

Internal magnetic fields in the high-temperature superconductor YBa2Cu3O7−δ from muon spin rotation experiments

1988 ◽  
Vol 72 (2) ◽  
pp. 175-180 ◽  
Author(s):  
B. Pümpin ◽  
H. Keller ◽  
W. Kündig ◽  
W. Odermatt ◽  
B. D. Patterson ◽  
...  
Keyword(s):  
High Temperature ◽  
Magnetic Fields ◽  
High Temperature Superconductor ◽  
Muon Spin ◽  
Spin Rotation ◽  
Muon Spin Rotation

High-temperature superconductor based composites: Large magnetoresistance in weak magnetic fields

2001 ◽  
Vol 27 (11) ◽  
pp. 952-955 ◽  
Author(s):  
D. A. Balaev ◽  
D. M. Gohfeld ◽  
S. I. Popkov ◽  
K. A. Saihutdinov ◽  
M. I. Petrov
Keyword(s):  
High Temperature ◽  
Magnetic Fields ◽  
High Temperature Superconductor ◽  
Weak Magnetic Fields

scholarly journals AC losses of no-insulation high temperature superconductor (RE)Ba2Cu3Ox coils induced by ripple magnetic fields in machines

2020 ◽  
Author(s):  
Yawei Wang
Keyword(s):  
High Temperature ◽  
Magnetic Fields ◽  
High Temperature Superconductor ◽  
Eddy Currents ◽  
Ac Loss ◽  
Ac Losses ◽  
Induced Current ◽  
Risk Optimization ◽  
Current Flows ◽  
The Stability

<p>No-insulation high temperature superconductor (NI HTS) (RE)Ba2Cu3Ox coil technology is effective in enhancing the thermal stability of HTS coils. Applying the NI technique on the rotor windings of HTS machines can improve the stability and reliability of the machines. However, the NI HTS rotor windings experience ripple magnetic fields, which leads to induced eddy currents through the turn-to-turn contacts. The accompanying turn-to-turn losses will considerably affect the machine efficiency. In this study, we compared experimentally the losses of NI HTS coils subjected to external AC magnetic fields with those of insulated coils. Measurement system based on calibration-free method is developed for the AC loss measurement on HTS coils exposed to external AC magnetic fields. The results show that the AC loss of NI HTS coils can be 20 times higher than that of insulated HTS coils, and lowering turn-to-turn resistivity can significantly reduce this AC loss. Modeling analysis shows that most of induced current flows in the outer turns of the NI HTS coil because of skin effect, and lower turn-to-turn resistivity leads to higher induced current in superconducting layers and more significant accumulation of turn-to-turn loss. This will increase quench risk. Optimization of turn-to-turn resistivity is required when the NI HTS coil is applied in the machines environments. </p>

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