Simulations of Nonuniform Behaviors of Multiple No-Insulation (RE)Ba2Cu3O7-x HTS Pancake Coils During Charging and Discharging

Song, Honghai; Wang, Yawei

doi:10.1109/tasc.2015.2513412

Cited by 35 publications

(10 citation statements)

References 10 publications

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“…Based on experimental and simulation results, the peak electromagnetic torque was not obvious for small diameter aluminum billets (<200 mm). The world's first commercial MW-class superconducting DC induction heater was proposed and developed by China in 2019 [4]- [7], [9], [13], [19]- [21], [24], [36]- [46]. It has been designed for aluminum billets with diameters of 200-446 mm and lengths of 80-1500 mm.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Peak Electromagnetic Torque Characteristics for Superconducting DC Induction Heaters

Yang

Dai

et al. 2020

IEEE Access

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The efficiency of novel superconducting direct current (DC) induction heaters can be up to 80-90%. This is much higher than the 40-50% of conventional alternating current induction heaters. Induction heaters are used to preheat aluminum billets in extrusion pressing. Such devices use a driving motor to rotate the billet. A peak in the electromagnetic torque appears at low rotation speeds (of the motor). Therefore, this peak electromagnetic torque is of particular interest when designing the driving system, which is one of the main challenges for megawatt-class superconducting DC induction heaters. In this paper, the peak electromagnetic torque characteristics of different sized billets were analyzed. A numerical 3D finite element method model was built to analyze the peak electromagnetic torque and resistive heating power behavior of aluminum billets. The results obtained from simulations and experiments match well. The effect of the following five relative parameters, on electromagnetic torque and resistive heating power, were studied: billet diameter, billet length, magnetic flux density, billet material, and electrical conductivity. The peak electromagnetic torque increases nonlinearly with increasing billet diameter, up to 640 mm. The time elapsed between the peak to stable torque decreases nonlinearly with increasing magnetic flux density. The effects of billet material (copper, titanium alloy and stainless steel) on torque were analyzed and compared. These results are likely to guide more cost-effective and practical designs for the billet driving system of superconducting DC induction heaters. INDEX TERMS Superconducting DC induction heater, peak electromagnetic torque, aluminum billet, magnetic flux density.

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Section: Introductionmentioning

confidence: 99%

Analysis of Peak Electromagnetic Torque Characteristics for Superconducting DC Induction Heaters

Yang

Dai

et al. 2020

IEEE Access

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“…Moreover, unlike an insulated coil, an NI coil does not burn out under an overcurrent, which is twice as large as the critical current [9,14,15]. Recently, NI coils with high thermal stability and selfprotecting features have been widely studied to provide guidelines for the potential design of magnets in the future [10,12,[15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Thermal stability and mechanical behavior in no-insulation high-temperature superconducting pancake coils

Liu

Zhang

Yong

et al. 2018

Supercond. Sci. Technol.

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No-insulation (NI) high-temperature superconducting (HTS) coils exhibit high thermal stability and self-protecting features compared with traditional insulated HTS coils. As NI coils experience heat disturbance, the underlying mechanism of the heat propagation, the changes of the central field and voltage of the coil need to be further explored. Moreover, due to the rapid temperature rise caused by the heat disturbance, the coil typically suffers from large strain and stress. Therefore, the mechanical behavior is also a vital factor in the design and operation of superconducting magnets. This paper proposes a multiphysics quench model to study the thermal stability, composed of an equivalent circuit axisymmetric model combined with a two-dimensional magnetic field model and a one-dimensional (1D) heat transfer model. An additional 1D solid mechanical model is used to analyze the mechanical behavior of the NI coil. The results indicate that when the temperature of the coil exceeds its critical value, the current flows along the radial direction. The heat generated by the radial resistance of the coil is small, so that it is difficult to induce a quench. The thermal expansion and heat propagation velocity also affect the distributions of the hoop and radial stresses in the coil. The change of the hoop stress is larger than that of the radial stress, and the electromagnetic force has a relatively small effect in the self-field. The pulsed energy, inner diameter of the coil and location of the heater are all found to have an observable effect on the thermal stability and mechanical behavior.

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“…The no-insulation (NI) approach to (RE)Ba 2 Cu 3 O x (REBCO) high temperature superconducting (HTS) magnets is one of the most innovative new approaches to high field superconducting magnet design, resulting in higher winding pack density and superior thermal stability, as compared to conventionally-insulated REBCO magnets. NI coils are expected to be selfprotecting, recovering from quenches without external quench protection mechanisms or other active measures [1][2][3][4][5][6][7][8][9][10][11][12][13]. As a result, the NI approach reduces the costs of fabrication and operation of REBCO magnets.…”

Section: Introductionmentioning

confidence: 99%

Improved stability, magnetic field preservation and recovery speed in (RE)Ba₂Cu₃O_x-based no-insulation magnets via a graded-resistance approach

Chan

Schwartz

2017

Supercond. Sci. Technol.

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The no-insulation (NI) approach to winding (RE)Ba2Cu3Ox (REBCO) high temperature superconductor solenoids has shown significant promise for maximizing the efficient usage of conductor while providing self-protecting operation. Self-protection in a NI coil, however, does not diminish the likelihood that a recoverable quench occurs. During a disturbance resulting in a recoverable quench, owing to the low turn-to-turn contact resistance, transport current bypasses the normal zone by flowing directly from the current input lead to the output lead, leading to a near total loss of the azimuthal current responsible for magnetic field generation. The consequences are twofold. First, a long recovery process is needed to recharge the coil to full operational functionality. Second, a fast magnetic field transient is created due to the sudden drop in magnetic field in the quenching coil. The latter could induce a global inductive quench propagation in other coils of a multi-coil NI magnet, increasing the likelihood of quenching and accelerating the depletion of useful current in other coils, lengthening the post-quench recovery process. Here a novel graded-resistance method is proposed to tackle the mentioned problems while maintaining the superior thermal stability and self-protecting capability of NI magnets. Through computational modeling and analysis on a hybrid multiphysics model, patterned resistive-conductive layers are inserted between selected turn-to-turn contacts to contain hot-spot heat propagation while maintaining the turn-wise current sharing required for self-protection, resulting in faster post-quench recovery and reduced magnetic field transient. Effectiveness of the method is studied at 4.2 and 77 K. Through the proposed method, REBCO magnets with high current density, high thermal stability, low likelihood of quenching, and rapid, passive recovery emerge with high operational reliability and availability.

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Simulations of Nonuniform Behaviors of Multiple No-Insulation (RE)Ba₂Cu₃O_7-x HTS Pancake Coils During Charging and Discharging

Cited by 35 publications

References 10 publications

Analysis of Peak Electromagnetic Torque Characteristics for Superconducting DC Induction Heaters

Analysis of Peak Electromagnetic Torque Characteristics for Superconducting DC Induction Heaters

Thermal stability and mechanical behavior in no-insulation high-temperature superconducting pancake coils

Improved stability, magnetic field preservation and recovery speed in (RE)Ba₂Cu₃O_x-based no-insulation magnets via a graded-resistance approach

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Simulations of Nonuniform Behaviors of Multiple No-Insulation (RE)Ba2Cu3O7-x HTS Pancake Coils During Charging and Discharging

Cited by 35 publications

References 10 publications

Analysis of Peak Electromagnetic Torque Characteristics for Superconducting DC Induction Heaters

Analysis of Peak Electromagnetic Torque Characteristics for Superconducting DC Induction Heaters

Thermal stability and mechanical behavior in no-insulation high-temperature superconducting pancake coils

Improved stability, magnetic field preservation and recovery speed in (RE)Ba2Cu3Ox-based no-insulation magnets via a graded-resistance approach

Contact Info

Product

Resources

About

Simulations of Nonuniform Behaviors of Multiple No-Insulation (RE)Ba₂Cu₃O_7-x HTS Pancake Coils During Charging and Discharging

Improved stability, magnetic field preservation and recovery speed in (RE)Ba₂Cu₃O_x-based no-insulation magnets via a graded-resistance approach