Design, construction and 13 K conduction-cooled operation of a 3 T 100 mm stainless steel cladding all-REBCO magnet

Jang, Jae Young; Yoon, Sanghyun; Hahn, Seungyong; Hwang, Young Jin; Kim, Jaemin; Shin, Kang Hwan; Cheon, Kyekun; Kim, Kwang-min; In, Sehwan; Hong, Yong-Ju; Yeom, Hankil; Lee, Hunju; Moon, Seung‐Hyun; Lee, SangGap

doi:10.1088/1361-6668/aa8354

Cited by 53 publications

(23 citation statements)

References 29 publications

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“…Therefore, the effect of applying the proposed system to the INS coil has been confirmed. However, it is necessary to examine further the applicability of this method to the metal clad superconducting coil and the LTS coil [24,25].…”

Section: Discussion and Outlooksmentioning

confidence: 99%

A Novel Fault Diagnosis Method for High-Temperature Superconducting Field Coil of Superconducting Rotating Machine

Song

Choi

et al. 2019

Applied Sciences

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In this paper, a new method is presented for sensitive quench detection in high-temperature superconductor (HTS) rotating machinery. The normal zone propagation velocity of an HTS is about 1000 times slower than that of a low-temperature superconductor. Therefore, the propagation of normal zone resistance, which occurs when the HTS transits from the superconducting state to the normal state, is also slower. Thus, it is difficult to detect the abnormal signals by voltage measurement using voltage taps. Moreover, the monitoring signal includes noise generated by interaction between the HTS rotating machinery and the industrial environment. Therefore, when quenching occurs in the HTS rotating machinery, a thermal runaway occurs in the hot spot. Furthermore, the magnetic energy stored in the HTS coil can damage the machinery. For these reasons, a new method is proposed for sensitive quench detection that reduces the noise generated from the power supply and from the HTS rotating machinery, using both an RLC resonance circuit and fast Fourier transform analysis.

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Section: Discussion and Outlooksmentioning

confidence: 99%

A Novel Fault Diagnosis Method for High-Temperature Superconducting Field Coil of Superconducting Rotating Machine

Song

Choi

et al. 2019

Applied Sciences

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“…Figure 10 shows the B-H curve and iron loss curve according to the peak value of the alternating magnetic field. The electrical resistance of the HTS material was set to zero using the user material-setting function, and the characteristic resistance of the NI field coil was obtained from Equation (1) [28] and the experimental results of test coils in Section 2. From Equation (1), the contact surface resistances of each coil are obtained to be 1.56, 1.83, and 4.34 µΩ•m 2 , respectively.…”

Section: Simulation Model Of the Hts Hsm Using The Ni Hts Field Coilmentioning

confidence: 99%

“…Additionally, in the section after the HTS field coil was fully excited, the time step was set to 0.1 ms, and the rotor was set to move at the rated rotation speed of 2400 rpm. of the NI field coil was obtained from Equation (1) [28] and the experimental results of test coils in Section 2. From Equation ( 1), the contact surface resistances of each coil are obtained to be 1.56, 1.83, and 4.34 µΩ•m 2 , respectively.…”

Section: Simulation Model Of the Hts Hsm Using The Ni Hts Field Coilmentioning

confidence: 99%

Design and Characteristic Analysis of a Homopolar Synchronous Machine Using a NI HTS Field Coil

Hwang

2021

Energies

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This paper deals with a homopolar synchronous machine (HSM) applying high-temperature superconducting (HTS) field coils. Superconductors, especially high-temperature superconductors, have high potential as advanced materials for next-generation electrical machines due to their high critical current density and excellent mechanical strength. However, coils made with high-temperature superconductors have a high risk of being damaged in the event of a quench due to the intrinsic low normal zone propagation velocity (NZPV). Therefore, the coil protection issue has been regarded as one of the most important research fields in HTS coil applications. Currently, the most actively studied method for quench protection of the HTS coils is the no-insulation (NI) winding technique. The NI winding technique is a method of winding an HTS coil without inserting an insulating material between turns. This method can automatically bypass the current to the adjacent turn when a local quench occurs inside the HTS coil, greatly improving the operating stability of the HTS coils. Accordingly, many institutions are conducting research to develop advanced electrical machines using NI HTS coils. However, the NI HTS coil has its intrinsic charge/discharge delay problem, which makes it difficult to successfully develop electrical machines using the NI HTS coil. In this study, we investigated how this charging/discharging problem appeared when the NI HTS coil was used in an HTS homopolar synchronous machine (HSM) which is one of the electrical machines with a high possibility of applying the HTS coil in the future because it has a stationary field coil structure. For this, the characteristic resistances of HTS coils were experimentally obtained and applied to the simulation model.

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“…For large-scale NI magnets, the ramping process of the power supply current is usually interrupted several times because of the temperature rise induced by ramping loss [29]. Furthermore, there are more and more concerns about the mechanical damage of HTS magnets [30][31][32][33][34]. The delamination has been observed in superconductor tapes after the quench of the magnet [35].…”

Section: Introductionmentioning

confidence: 99%

Ramping loss and mechanical response in a no-insulation high-temperature superconducting layer-wound coil and intra-layers no-insulation coil

Liu

Yong

2021

Sci. China Technol. Sci.

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The layer-wound coil has a great potential in nuclear magnetic resonance and magnetic resonance imaging owing to the better spatial homogeneity of the magnetic field. However, high-temperature superconducting (HTS) coil wound by no-insulation (NI) layer-wound technique has been verified with a long field delay time. A new method named the intra-layer no-insulation (LNI) winding technique has been proposed to reduce the charging delay time of the coil. This paper is mainly to study and compare the ramping loss and mechanical characteristics of the layer-wound coil and LNI coil. The results indicate that the total ramping loss can be significantly reduced by using the LNI winding method. The effects of the ramping rate of power supply current and the contact resistivity on the ramping loss are also discussed in the paper. Furthermore, the stress distributions in the layer-wound coil and LNI coil are compared, where the cooling process and Lorentz force are both considered. It can be found that the copper sheet of the LNI coil experiences relatively higher stress than its (RE)Ba 2 Cu 3 O x (REBCO) conductor layer. Meanwhile, the magnitude of stress generated in the REBCO conductor of the LNI coil is slightly different from that of the layer-wound coil.

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Design, construction and 13 K conduction-cooled operation of a 3 T 100 mm stainless steel cladding all-REBCO magnet

Cited by 53 publications

References 29 publications

A Novel Fault Diagnosis Method for High-Temperature Superconducting Field Coil of Superconducting Rotating Machine

A Novel Fault Diagnosis Method for High-Temperature Superconducting Field Coil of Superconducting Rotating Machine

Design and Characteristic Analysis of a Homopolar Synchronous Machine Using a NI HTS Field Coil

Ramping loss and mechanical response in a no-insulation high-temperature superconducting layer-wound coil and intra-layers no-insulation coil

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