Calculation of alternating current losses in stacks and coils made of second generation high temperature superconducting tapes for large scale applications

Zermeño, V.; Abrahamsen, Asger Bech; Mijatović, Nenad; Jensen, Bogi Bech; Sørensen, Mads Peter

doi:10.1063/1.4827375

Cited by 305 publications

(207 citation statements)

References 20 publications

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“…The use of homogenized stacks is an alternative to overcome the aforementioned challenges [19,20]. It consists in replacing the stack by a bulk superconductor with homogenized properties, as can be seen in figure 4.…”

Section: Homogenized Hts Stacksmentioning

confidence: 99%

H-formulation for simulating levitation forces acting on HTS bulks and stacks of 2G coated conductors

Sass¹,

Sotelo²,

Andrade³

et al. 2015

Supercond. Sci. Technol.

126

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Several techniques to model high temperature superconductors (HTSs) are used throughout the world. At the same time, the use of superconductors in transportation and magnetic bearings promises an increase in energy efficiency. However, the most widespread simulation technique in the literature, the H-formulation, has not yet been used to simulate superconducting levitation. The goal of this work is to present solutions for the challenges concerning the use of the H-formulation to predict the behavior of superconducting levitators built either with YBCO bulks or stacks of 2G wires. It is worth mentioning the originality of replacing bulks with HTS stacks in this application. In our simulation methodology, the movement between the HTS and the permanent magnet was avoided by restricting the simulation domain to the HTS itself, which can be done by applying appropriate boundary conditions and analytical expressions for the source field. Commercial finite element software was used for the sake of ease of implementation. Simulation results were compared with experimental data, showing good agreement. We conclude that the H-formulation is suitable for problems involving moving objects and is a good alternative to other approaches for simulating superconducting magnetic bearings.

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Section: Homogenized Hts Stacksmentioning

confidence: 99%

H-formulation for simulating levitation forces acting on HTS bulks and stacks of 2G coated conductors

Sass¹,

Sotelo²,

Andrade³

et al. 2015

Supercond. Sci. Technol.

126

View full text Add to dashboard Cite

show abstract

“…For this work, the H-formulation of the magnetic fields was implemented in COMSOL [16] using zeroth-order edge elements [13]. A particular advantage of this combi nation of formulation and element type is that the current density derived from the solution is homogeneous within each mesh element.…”

Section: Methodsmentioning

confidence: 99%

“…In the superconducting actuator model, the stacks of tapes consisting of 120 layers are modeled by 10 homogeneous bulk regions [13].…”

Section: Modeling Of Superconducting Materialsmentioning

confidence: 99%

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Modeling and comparison of superconducting linear actuators for highly dynamic motion

Bruyn¹,

Jansen²,

Lomonova³

2015

Archives of Electrical Engineering

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This paper presents a numerical modeling method for AC losses in highly dynamic linear actuators with high temperature superconducting (HTS) tapes. The AC losses and generated force of two actuators, with different placement of the cryostats, are compared. In these actuators, the main loss component in the superconducting tapes are hysteresis losses, which result from both the non-sinusoidal phase currents and move ment of the permanent magnets. The modeling method, based on the H-formulation of the magnetic fields, takes into account permanent magnetization and movement of per manent magnets. Calculated losses as function of the peak phase current of both super conducting actuators are compared to those of an equivalent non-cryogenic actuator.

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“…8,9 Then, the electromagnetic behaviors and AC losses in stack of superconducting strips were widely studied by investigators, such as vertical arrays, horizontal arrays, and matrix arrays. [10][11][12][13][14][15][16] In addition, since the AC loss is dependent on many factors, some researchers also paid their attentions to the effects of frequency and defects on the AC losses of superconductors. [17][18][19][20][21][22][23] The above investigations mainly studied the AC losses in superconducting layers without ferromagnetic substrate.…”

Section: Introductionmentioning

confidence: 99%

Effect of the magnetic material on AC losses in HTS conductors in AC magnetic field carrying AC transport current

et al. 2015

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This paper presents an investigation on the AC losses in several typical superconducting composite conductors using the H-formulation model. A single superconducting strip with ferromagnetic substrate or cores and a stack of coated conductors with ferromagnetic substrates are studied. We consider all the coated conductors carrying AC transport currents and simultaneously exposed to perpendicular AC magnetic fields. The influences of the amplitude, frequency, phase difference and ferromagnetic materials on the AC losses are investigated. The results show that the magnetization losses of single strip and stacked strips have similar characteristics. The ferromagnetic substrate can increase the magnetization loss at low magnetic field, and decrease the loss at high magnetic field. The ferromagnetic substrate can obviously increase the transport loss in stacked strips. The trends of total AC losses of single strip and stacked strips are similar when they are carrying current or exposed to a perpendicular magnetic field. The effect of the frequency on the total AC losses of single strip is related to the amplitude of magnetic field. The AC losses decrease with increasing frequency in low magnetic field region while increase in high magnetic field region. As the phase difference changes, there is a periodic variation for the AC losses. Moreover, when the strip is under only the transport current and magnetic field, the ferromagnetic cores will increase the AC losses for large transport current or field.

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Calculation of alternating current losses in stacks and coils made of second generation high temperature superconducting tapes for large scale applications

Cited by 305 publications

References 20 publications

H-formulation for simulating levitation forces acting on HTS bulks and stacks of 2G coated conductors

H-formulation for simulating levitation forces acting on HTS bulks and stacks of 2G coated conductors

Modeling and comparison of superconducting linear actuators for highly dynamic motion

Effect of the magnetic material on AC losses in HTS conductors in AC magnetic field carrying AC transport current

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