期刊
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
卷 32, 期 4, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2021.3131135
关键词
High-temperature superconductors; Superconducting magnets; Magnetic resonance imaging; Magnetic flux; Mathematical models; Voltage; Transformers; Dynamic voltage; HTS flux pump; magnet; switch
This paper proposes a novel approach to modeling HTS transformer-rectifier flux pumps, which can charge HTS magnetic loads without the need for bulky current leads or expensive cryogenic requirements. The model was built in MATLAB/Simulink and the simulation results show that the system can quickly charge the HTS load under given parameters.
Thispaper proposes a novel approach to the modelling of HTS transformer-rectifier flux pumps that can charge HTS magnetic loads without the need for bulky current leads or expensive cryogenic requirements. The model was built in MATLAB/Simulink for a flux pump with 2 HTS switches, an HTS transformer with a primary inductance of 15 mH, secondary inductance of 50 mu H and an HTS magnetic load with an inductance of 2 mH. With a 5 A pk-pk triangular current waveform at 2 Hz the system can load the HTS load to 34.63 A in 5 s. This incremental addition of flux to the load demonstrates the advantage of flux pumps as they can charge high-field magnets without the need for large power sources. The speed of flux pumping is improved by increasing the system frequency, the magnitude of the dynamic voltage developed in the HTS switches and by increasing the primary inductance of the transformer. This has widespread industrial applicability in fields such as the charging of high-field magnets for MRI systems.
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