Electromagnetic, Thermal, and Mechanical Quench Simulation of NI REBCO Pancake Coils for High Magnetic Field Generation

Noguchi, So

doi:10.1109/tasc.2019.2904317

Cited by 48 publications

(40 citation statements)

References 9 publications

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“…Therefore, the loop current of the DP module required time to be fully saturated. Regarding the 2G HTS open-loop non-insulation coils, there is a well-established simplified circuit model that represents a series-parallel model of inductance and resistance, so that the charging and discharging characteristics of the coils can be simulated [21]. A PCS branch is added to the set of the circuit model to simulate the excitation process of the closed-loop coil, as shown in Figure 17.…”

Section: Excitation Experiments Under Closed-loop Conditionmentioning

confidence: 99%

High-Temperature Superconducting Non-Insulation Closed-Loop Coils for Electro-Dynamic Suspension System

Yu³

et al. 2021

Electronics

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The null-flux electro-dynamic suspension (EDS) system is a feasible high-speed maglev system with speeds of above 600 km/h. Owing to their greater current-carrying capacity, superconducting magnets can provide a super-magnetomotive force that is required for the null-flux EDS system, which cannot be provided by electromagnets and permanent magnets. Relatively mature high-speed maglev technology currently exists using low-temperature superconducting (LTS) magnets as the core, which works in the liquid helium temperature region (T ⩽ 4.2 K). Second-generation (2G) high-temperature superconducting (HTS) magnets wound by REBa2Cu3O7−δ (REBCO, RE = rare earth) tapes work above the 20 K region and do not rely on liquid helium, which is rare on Earth. In this study, the HTS non-insulation closed-loop coils module was designed for an EDS system and excited with a persistent current switch (PCS). The HTS coils module can work in the persistent current mode and exhibit premier thermal quenching self-protection. In addition, a full-size double-pancake (DP) module was designed and manufactured in this study, and it was tested in a liquid nitrogen (LN2) environment. The critical current of the DP module was approximately 54 A, and it could work in the persistent current mode with an average decay rate measured over 12 h of 0.58%/day.

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Section: Excitation Experiments Under Closed-loop Conditionmentioning

confidence: 99%

High-Temperature Superconducting Non-Insulation Closed-Loop Coils for Electro-Dynamic Suspension System

Yu³

et al. 2021

Electronics

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“…of CERC REBCO single pancake coil, which consists of the coil current path and the conductive-epoxy-resin path in parallel. The circuit element of each winding turn is composed of the REBCO layer resistance , the copper matrix resistance , and the inductance [13]. Here, to consider the magnetic field and temperature dependencies of REBCO critical current characteristics, a power index E-J characteristic model given in [14] is used as a critical current model of REBCO layer resistance.…”

Section: Simulation Modelmentioning

confidence: 99%

“…Fig. 3 shows an equivalent circuit of conventional NI coil [13] for comparison. The azimuthal components in the coil are the same as those of the CERC coil.…”

Section: Simulation Modelmentioning

confidence: 99%

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Sudden Discharging and Overcurrent Simulations of REBCO Coils Coated With Conductive Epoxy Resin

Mato

Noguchi

2021

IEEE Trans. Appl. Supercond.

Self Cite

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In 2011, a no-insulation (NI) winding technique was first proposed. Rare-Earth Barium Copper Oxide (REBCO) pancake coils using the NI winding technique are promising to generate an ultrahigh magnetic field, because the NI winding technique drastically enhances the thermal stability. When a local hot spot appears on a turn of the NI REBCO pancake coil, the enforced current can bypass into the adjacent turns to suppress the Joule heat generation. Recently, different types of REBCO coils to enhance the thermal stability by escaping the current flow from a local hot spot have been researched and developed. A few years ago, a REBCO single pancake coil whose upper surface was coated with conductive epoxy resin was proposed as one kind of NI winding techniques. The high thermal stability of conductive-epoxy-resin-coated (CERC) REBCO single pancake coil was demonstrated through an overcurrent test. However, the current behavior in the coil is still unclear. Therefore, we have newly developed an equivalent circuit model for CERC REBCO pancake coils. The sudden discharging and overcurrent tests were simulated for CERC REBCO pancake coils, and the resistance parameters were varied to investigate the coil stability.  Index Terms-Conductive-epoxy-resin-coated REBCO coil, magnet stability, no-insulation winding technique, quench protection.

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“…In 2000 s, the current source output current has reached the preset threshold, but the magnetic flux in the center of the coil is still increasing, for which there is a certain inductive resistance of the DP module, which makes the coil turns and the PCS shunt occur, thus the loop current of the coil needs some time to fully be saturated. Regarding the open-loop non-insulation 2G HTS coils, there is a well-established circuit model that is simplified to a series-parallel model of inductance and resistance, so that the charging and discharging characteristics of the coils can be simulated [20]. The PCS branch is added to the set of the circuit model to simulate the excitation process of the closed-loop coil, as shown in Figure 18, where R ct represents the turn-to-turn contact resistance, L the total coil inductance, and R mt and R sc the matrix resistance and equivalent REBCO layer resistance, respectively.…”

Section: Experiments Of Excitation Under Closed-loop Conditionmentioning

confidence: 99%

High Temperature Superconducting Non-insulation Closed-loop Coils for Electro-dynamic Suspension System

Lu¹,

Wu²,

Yu³

et al. 2021

Preprint

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Null-flux Electro-dynamic suspension (EDS) system promises to be one of the feasible high-speed maglev systems above 600 km/h. On account of its greater current-carrying capacity, superconducting magnet can provide super-magnetomotive force that is required for null-flux EDS system and cannot be provided by electromagnets and permanent magnets. There is already a relatively mature high-speed maglev technology with low temperature superconducting (LTS) magnets as the core, which works in the liquid helium temperature region (T≤4.2 K). 2-Generation high temperature superconducting (HTS) magnet winded by REBa2Cu3O7−δ (REBCO, RE=rare earth) tapes works above 20 K region and do not need to count on liquid helium which is rare on earth. This paper designed HTS no-insulation closed-loop coils applied for EDS system and energized with persistent current switch. The coils can work at persistent current model and has premier thermal quench self-protection. Besides, a full size double-pancake module was designed and manufactured in this paper, and it was tested in liquid nitrogen. The double-pancake module’s critical current is about 54 A and it is capable of working at persistent current model, whose average decay rate measured in 12 hours is 0.58%/day.

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Electromagnetic, Thermal, and Mechanical Quench Simulation of NI REBCO Pancake Coils for High Magnetic Field Generation

Cited by 48 publications

References 9 publications

High-Temperature Superconducting Non-Insulation Closed-Loop Coils for Electro-Dynamic Suspension System

High-Temperature Superconducting Non-Insulation Closed-Loop Coils for Electro-Dynamic Suspension System

Sudden Discharging and Overcurrent Simulations of REBCO Coils Coated With Conductive Epoxy Resin

High Temperature Superconducting Non-insulation Closed-loop Coils for Electro-dynamic Suspension System

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