Analysis and Comparison Between No-Insulation and Metallic Insulation REBCO Magnet for the Engineering Design of a 1-MW DC Induction Heater

Wang, Yawei; Yang, Ping; Li, Ké; Song, Honghai; Yang, Jie; Ma, Chao; Jin, Zhijian; Hong, Zhiyong

doi:10.1109/tasc.2017.2669918

Cited by 29 publications

(14 citation statements)

References 21 publications

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“…High temperature superconductors (HTSs) show great advantages, in terms of energy conservation, because of their zeroresistance characteristics. They have been widely applied to improve energy efficiency in electrical devices, such as power cables, fault current limiters, and magnets [1], [4]- [19].…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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%

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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“…Therefore, the AC loss of NI HTS coils exposed to AC external magnetic fields can be reduced by both increasing and reducing the turn-to-turn resistivity. Lowering turn-to-turn resistivity always means better thermal stability, while this will lead to more serious charging delay, which is also challenging for the fast magnetization and demagnetization of NI HTS coils [40,41]. Increasing the turn-to-turn resistivity can significantly reduce the charging delay, while this may also considerably reduce the thermal stability of NI HTS coils.…”

Section: Ac Loss Of Ni Coils Induced By Ripple Magnetic Fieldsmentioning

confidence: 99%

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

Wang¹

2020

Preprint

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<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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“…So compared to the HTS DC induction heaters that can preheat larger aluminum billets, the simulation models have fewer finite element units, which will take less calculation time. The first commercial MW-class HTS DC induction heater for preheating large aluminum billets has been designed years ago and assembled in early 2019 [8]- [10]. And it has been designed to preheat the aluminum billets with diameters of 200 -446 mm and lengths of 800 -1760 mm.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic and Thermal Analysis of Cylindrical Aluminum Billet Heated by 1MW HTS DC Induction Heater

Yan

Dai

2020

IEEE Access

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In order to improve the efficiency of the conventional AC induction heater, an HTS DC induction heating technology has been proposed. A 1 MW HTS DC induction heater has been developed, and the efficiency of the HTS DC induction heater can be more than 80% due to the HTS DC magnet with no AC loss. The electromagnetic and thermal analysis of the HTS DC induction heater is necessary for further optimization of the 1 MW HTS DC induction heater. A 3D finite element simulation model for the coupling analysis of electromagnetic and thermal has been built based on the actual 1 MW HTS DC induction heater and optimized for accelerating the computing speed by using permanent magnet instead of the HTS magnet. The heating process of the cylindrical aluminum billet has also been simulated and compared with the experimental results. The results show that the simulation results can be in line with the experimental results. What is more, the optimized simulation model can be used to further optimize the device parameters for different workpiece temperature distributions, or design and evaluate the new HTS DC induction heater in the future. INDEX TERMS Induction heating, high temperature superconductor (HTS), aluminum, direct current (DC), electromagnetic and thermal analysis.

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Analysis and Comparison Between No-Insulation and Metallic Insulation REBCO Magnet for the Engineering Design of a 1-MW DC Induction Heater

Cited by 29 publications

References 21 publications

Analysis of Peak Electromagnetic Torque Characteristics for Superconducting DC Induction Heaters

Analysis of Peak Electromagnetic Torque Characteristics for Superconducting DC Induction Heaters

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

Electromagnetic and Thermal Analysis of Cylindrical Aluminum Billet Heated by 1MW HTS DC Induction Heater

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