Uniform trapped fields produced by stacks of HTS coated conductor tape

Mitchell-Williams, Tom B.; Baškys, Algirdas; Hopkins, Simon C.; Kalitka, V.S.; Molodyk, Alexander; Glowacki, B.A.; Patel, Anup

doi:10.1088/0953-2048/29/8/085008

Cited by 21 publications

(9 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The obtained results are relevant also for different applications, such as levitation [17], or electric motors based on the diamagnetic behaviour of a bulk HTS [18]. The results can help understand the behaviour of tilted stacks, which were observed to provide good homogeneity and strength of the field [19]. Similar patterns of currents are observed in magnetic shields, which can be used to decrease demagnetisation [20], especially open magnetic shields made of short pieces of tapes [21].…”

Section: Introductionmentioning

confidence: 56%

See 1 more Smart Citation

Distribution of Trapped Magnetic Flux in Superconducting Stacks Magnetised by Angled Field

Smara

Climente-Alarcón

Glowacki

2019

J Supercond Nov Magn

View full text Add to dashboard Cite

Some novel energy applications require the use of complex shapes of stacks of superconducting tapes as trapped-flux magnets. A trapped-flux magnet magnetised in a superconducting motor may experience an angled magnetising field rather than a field normal to its surface. This will affect the trapped magnetic flux distribution. This work presents the results of the numerical and experimental analyses of the stacks magnetised in an angled magnetic field. The finite element model using H-formulation is developed to compute the induced superconducting currents. The measurements are performed on stacks with different thicknesses and with different orientations against a magnetising field. The resulting distribution of the magnetic flux as well as the electric currents is computed, presented and discussed in details. The importance of the observed distribution patterns is assessed in the context of the implementation of such stacks in a fully superconducting electric motor.

show abstract

Section: Introductionmentioning

confidence: 56%

“…The measurements are performed using a scanning Hall probe magnetometry system, described at [19]. In the case of measurements with the angle of 0 • , the sample is placed in a holder directly under the scanning probe, both visible at the bottom of Fig.…”

Section: Methodsmentioning

confidence: 99%

Distribution of Trapped Magnetic Flux in Superconducting Stacks Magnetised by Angled Field

Smara

Climente-Alarcón

Glowacki

2019

J Supercond Nov Magn

View full text Add to dashboard Cite

show abstract

“…In most part of the published works the superconducting material was arranged in the form of coils; however, bulk superconductor with trapped field can also be used for electric machines [4][5][6]. Stacks of 2G tapes have been proposed as a potential substitute of bulk superconductors [7][8][9]. The literature also presents the 2G tapes stacks in several different applications, like: cables [10][11][12][13], rotational electric machines [14][15], superconducting levitation [16][17][18][19], etc.…”

Section: Introductionmentioning

confidence: 99%

Proposal of a Novel Design for Linear Superconducting Motor Using 2G Tape Stacks

Sotelo

Sass

Carrera

et al. 2018

IEEE Trans. Ind. Electron.

View full text Add to dashboard Cite

This manuscript presents a new design for superconducting linear motor (SLM). This SLM uses stacks of second generation (2G) superconducting tapes, which are responsible for replacing YBCO bulks. The proposed SLM may operate as a synchronous motor or as a hysteresis motor, depending on the load force magnitude. A small scale linear machine prototype with 2G stacks was constructed and tested to investigate the proposed SLM topology. The stator traveling magnetic field wave was represented by several Nd-Fe-B permanent magnets. A relative movement was produced between the stator and the stack, and the force was measured along the displacement. This system was also simulated by finite element method, in order to calculate the induced currents in the stack and determine the electromagnetic force. The H-formulation was used to solve the problem and a power law relation was applied to take into account the intrinsically nonlinearity of the superconductor. The simulated and measured results were in accordance. Simulated results were extrapolated, proving to be an interesting tool to scale up the motor in future projects. The proposed motor presented an estimated force density of almost 500 N/kg, which is much higher than any linear motor.

show abstract

“…So, in this paper, we will systematically study the trapped field demagnetization of a partially coupled stack with consideration of resistance between tapes under a time-varying alternating cross-field by minimum electromagnetic entropy production 2D method (MEMEP 2D). Soldered self-supporting stacks have been already experimentally constructed in 26,27 , which did not experience mechanical issues. However, cross-field demagnetization on these stacks has not been studied.…”

mentioning

confidence: 99%

Numerical modelling of soldered superconducting REBCO stacks of tapes suggests strong reduction in cross-field demagnetization

Pardo

2023

Sci Rep

View full text Add to dashboard Cite

Stacks of superconducting REBCO tapes (or “stacks”) can trap high magnetic fields, above 17 T. However, relatively low oscillating transverse magnetic fields can fully demagnetize the stacks. This is an issue if the stacks act as poles in the rotor of a superconducting motor, for instance. Here, we study the drastic suppression of cross-field demagnetization in stacks by soldering the tapes at the ends using a normal conductor. In particular, we analyzed by numerical modeling a stack of five REBCO thin films connected at the ends by resistances. The computed trapped field of a stack with zero solder resistance decays very fast at the beginning but then tends to stabilize to relatively high values, while the trapped field of an isolated stack (infinite resistance at the ends) decays further (it decays to zero if the transverse field is above the parallel penetration field). For intermediate solder resistances, the stable value of the trapped magnetic field is in between those of the isolated and zero-resistance configurations. Since the stable trapped field in soldered stacks increases with the number of tapes, stacks of sufficiently high number of soldered tapes could be immune to cross-field demagnetization. This opens the gate for a new kind of superconductors that mostly behave as bulks, especially if the stacks are made of delaminated tapes or it is possible to solder the tapes by very low resistance.

show abstract

Uniform trapped fields produced by stacks of HTS coated conductor tape

Cited by 21 publications

References 19 publications

Distribution of Trapped Magnetic Flux in Superconducting Stacks Magnetised by Angled Field

Distribution of Trapped Magnetic Flux in Superconducting Stacks Magnetised by Angled Field

Proposal of a Novel Design for Linear Superconducting Motor Using 2G Tape Stacks

Numerical modelling of soldered superconducting REBCO stacks of tapes suggests strong reduction in cross-field demagnetization

Contact Info

Product

Resources

About