Persistent Current Switch for HTS Superconducting Magnets: Design, Control Strategy, and Test Results

Li, Chao; Geng, Jianzhao; Shen, Boyang; Li, Xinru; Gawith, James; Ma, Jun; Yang, Jiabin; Coombs, Tim

doi:10.1109/tasc.2018.2889463

Cited by 18 publications

(11 citation statements)

References 19 publications

(17 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Numerous studies have shown that bulk superconductors and stacks of HTS tapes are capable of trapping magnetic fields of several teslas or higher and can therefore be used as pseudopermanent trapped field magnets (TFMs) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The range of potential practical applications of such magnets extends from magnetic bearings and levitation devices to motors and highfield magnets [1,2,16,[19][20][21][22][23]. For example, TFMs made from magnetized stacks of HTS tapes have been shown to provide higher levitation forces compared to bulks [24], whereas bulk HTSs look very promising for the development of compact high-torque rotating machines [18].…”

Section: Introductionmentioning

confidence: 99%

Modeling of vortex dynamics in HTSs with defects under the impact of pulsed magnetic field

Moroz

Kashurnikov

Rudnev

et al. 2021

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

By means of the Monte Carlo method, a numerical study of the vortex system in a high-temperature superconductor under the impact of pulses of magnetic field has been conducted. Various shapes and amplitudes of pulses have been considered. Samples with random and regular distributions of three different numbers of defects have been compared from the viewpoint of efficiency of flux trapping. The low-temperature behavior of vortices and their penetration into samples have been shown to be independent of the pulse shape but strongly dependent of the type of pinning distribution. Saturating dependences of density of trapped magnetic flux on the pulse amplitude have been obtained. The samples with random pinning demonstrated higher efficiency of flux trapping at lower pulse amplitudes, and the samples with a triangular lattice of defects—at higher amplitudes. If the amplitude exceeded the saturation field of both samples, the trapped field was almost equal. The increasing number of defects has lead to an increase in trapped field within the considered range of concentrations.

show abstract

Section: Introductionmentioning

confidence: 99%

Modeling of vortex dynamics in HTSs with defects under the impact of pulsed magnetic field

Moroz

Kashurnikov

Rudnev

et al. 2021

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…The DC current, I dc , is first injected to the spiral tape or the CORC cable via a ramp function, I r (t), and Dirichlet boundary condition is used for I r (t), as given in Eq. (7).…”

Section: Numerical Modelling a T-a Formulationmentioning

confidence: 99%

“…Rare-Earth Barium Copper Oxide (REBCO) hightemperature superconducting (HTS) coated conductors become promising candidates for power applications, such as rotating machines [1], [2], [3], flux pumps [4], [5] and persistent current switches [6], [7], [8], due to their excellent in-field critical current performance. In those HTS devices,…”

Section: Introductionmentioning

confidence: 99%

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

et al. 2023

View full text Add to dashboard Cite

In some high temperature superconducting (HTS) applications, HTS coated conductors carry DC current under external AC magnetic fields. Dynamic resistance occurs when the amplitude of the magnetic field is greater than the threshold magnetic field of the coated conductors. The resulting AC loss, termed as total loss, consists of dynamic loss due to dynamic resistance and magnetization loss due to the shielding currents caused by the AC magnetic field. Conductor on round core (CORC) cables wound with HTS coated conductors have attracted broad attention due to their large current-carrying capability and mechanical flexibility for coil applications. However, there has been no report on dynamic resistance and total loss in CORC cables. In this work, we present 3D FEM simulation results on the dynamic resistance and total loss of a spiral tape and three CORC cables, based on the T −A formulation. The number of layers of the CORC cables, the amplitude of the AC magnetic field and transport DC current levels have been varied to study the impact of those parameters on dynamic resistance and total loss of the three CORC cables. The simulation results show that magnetization loss without current in a spiral tape can be analytically estimated by Brandt and Indenbom's theoretical equation for a superconducting strip under perpendicular AC magnetic field with a geometric coefficient 2/π. Furthermore, dynamic resistance of the spiral tape and each tape in a single-layer cable can be predicted by the analytical equation for a strip carrying DC current under perpendicular AC magnetic field, also taking into account the geometric coefficient 2/π. The simulation results also show that the difference of total loss values in the three CORC cables depends on the shielding effect: the more layers of CORC cables, the lower each loss component. The two-layer Cable with each tape in the outer layer sitting on top of the tape in the inner layer has the lowest loss and the highest threshold magnetic field.

show abstract

“…[30][31][32][33] carried out investigation on the working principle of the transformer-rectifier HTS flux pump. [34][35][36][37][38][39] proposed different types of switches to improve the behavior in charging speed. [40][41][42][43][44][45] discussed the characteristics of the dynamic resistance, which determines the working performance of flux pump.…”

Section: Introductionmentioning

confidence: 99%

Modeling methodology for the transformer-rectifier flux pump considering electromagnetic and thermal coupling

Li,

Xin

et al. 2023

Supercond. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

High-temperature superconducting (HTS) magnets are promising in the application of high-intensity magnetic field. HTS flux pumps are devices that can charge closed HTS magnets without direct electrical contact. Simulation is an effective way to clarify the physical mechanism and provide further insight into the design of the device. In this work, we propose an accurate and efficient modeling methodology to simulate the transformer-rectifier HTS flux pump, which has considered electromagnetic and thermal coupling. The validity of the model has been verified by experimental results and theoretical calculations. The working characteristics of the HTS flux pump are investigated based on the proposed model, including DC bias component in the charging loop, the voltage recovery delay of the dynamic bridge and the temperature distribution in the dynamic bridge. The simulation results clearly depict working details of the device, in terms of electricity, magnetism and heat. The proposed model can serve as a powerful tool to design the HTS flux pump in practical applications.

show abstract

Persistent Current Switch for HTS Superconducting Magnets: Design, Control Strategy, and Test Results

Cited by 18 publications

References 19 publications

Modeling of vortex dynamics in HTSs with defects under the impact of pulsed magnetic field

Modeling of vortex dynamics in HTSs with defects under the impact of pulsed magnetic field

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

Modeling methodology for the transformer-rectifier flux pump considering electromagnetic and thermal coupling

Contact Info

Product

Resources

About