3D modeling of forces between magnet and HTS in a levitation system using new approach of the control volume method based on an unstructured grid

Alloui, Lotfi; Bouillault, Frédéric; Bernard, Laurent; Lévêque, Jean; Mimoune, S.M.

doi:10.1016/j.physc.2012.01.012

Cited by 22 publications

(14 citation statements)

References 13 publications

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“…It is one of the numerical methods widely used in computation of heat and fluid dynamic problems [7]. Furthermore, this method has been applied successfully to a variety of electromagnetic problems [8][9][10][11]. It uses a support space mesh based on an unstructured grid (Fig.…”

Section: Calculation Methodsmentioning

confidence: 99%

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Increasing flux density by HTS shielding pellet in superconducting synchronous machine based on flux concentration

Boumaraf

Mimoune

Alloui

et al. 2014

Int J Syst Assur Eng Manag

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In this paper, we propose a solution which enhances the performance of the inductor in high-power superconducting synchronous machines based on the flux concentration. The work is done by keeping the same topology and using a high temperature superconducting shielding pellet located between the two coils of the inductor. This pellet permits to recover the magnetic field which vanishes in the medium region due to the opposite direction of the coils. We did a 3D magnetostatic field analysis using the control volume method with unstructured grid. This analysis showed that the suggested solution allowed obtaining a maximum efficiency of about 8% in the flux density. . In fact, the previous superconducting inductor has been optimized and its new geometry provides higher performance when using NbTi wires [5]. In the same way, a modification of HTS shield length should decrease the magnetic flux concentration. INDEX TERMS:To increase the power in these types of machines, several ways are proposed. The first obvious solution suggests new superconducting wires with higher current density possibility, the second one consists in a biggest inductor radius dimension and the third alternative suggests exploring a long inductor length [6].In this work, we propose an ingenious solution by using a HTS shielding pellet between the two coils of the inductor. The introduction of this pellet enhances the performance of the inductor while keeping the same geometry as in the previous topology. The inserting of the pellet has the goal to recover the magnetic field that vanishes in the medium region due to the opposite direction of coils in previous geometry. To model the magnetostatic field, we adopted in this work a three dimensional (3D) magnetostatic field analysis using the control volume method (CVM) with unstructured grid. PROPOSED DESIGNThe previous structure of the superconducting inductor is based on the flux concentration (Fig. 1). The inductor uses both low-temperature superconductors (LTS) NbTi wires and High temperature superconductors (HTS) YBCO bulk. The LTS NbTi wires create a high magnetic field through two coaxial coils fed by opposite currents. Four YBCO bulk plates are located between the two coils to screen the normal component of the magnetic field. They are used as magnetic shields, shape the flux lines and then provide a spatial magnetic field variation.The inductor configuration allows a good flux concentration between the four YBCO shielding bulk plates and increases the magnetic flux density in the air gap providing a high power density and a high electromagnetic torque. The inductor is kept stationary in order to simplify the cryogenics and minimize cold losses [5].To increase moreover the power density of the superconducting motor by increasing magnetic flux density several ways are possible. One solution suggests new

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Section: Calculation Methodsmentioning

confidence: 99%

“…To calculate the flux in the lateral facets, the magnetic scalar potential V is expressed in referential (R') defined by (ξ,η) coordinates following the same procedure as in [11]. Using this transformation, we can express the derivative of the magnetic scalar potential in the referential (R).…”

Section: Adopted Approximationmentioning

confidence: 99%

Increasing flux density by HTS shielding pellet in superconducting synchronous machine based on flux concentration

Boumaraf

Mimoune

Alloui

et al. 2014

Int J Syst Assur Eng Manag

Self Cite

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“…PT and PB are respectively the top and bottom nodes of the control volume. The Laplacian in (1) is integrated over each 3D control volume following the same procedure as in [10]. The obtained algebraic system is solved iteratively by Gauss Seidel method.…”

Section: Magnetic Model and Calculation Methodsmentioning

confidence: 99%

Effect of HTS shielding pellet on the performance of superconducting synchronous motor based on flux concentration

Boumaraf

Titaouine

Benchabane

et al. 2014

2014 16th International Power Electronics and Motion Control Conference and Exposition

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In this paper, we propose a solution which enhances the performance of the inductor in high-power superconducting synchronous machines based on the flux concentration while keeping the same topology and using a high temperature superconducting shielding pellet located between the two coils of the inductor. This pellet permits to recover the magnetic field which vanishes in the medium region due to the opposite direction of the coils. A method for 3D magnetostatic field analysis using the control volume method with unstructured grid is proposed. With this topology, we have obtained a maximum efficiency of about 8% in the flux density.

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“…They adopt the finite element method (FEM). However, FEM is prone to numerical oscillations and convergence problems, in particular, if the constitutive law given by a power law relation between the electric field and the current density is used [10], [11]. Different works have shown that numerical methods based on conservative approaches allow avoiding numerical oscillations [11]- [13].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Trapped Magnetic Field During Magnetization Process by Using SPA Method of Bulk Superconductor

et al. 2015

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3D modeling of forces between magnet and HTS in a levitation system using new approach of the control volume method based on an unstructured grid

Cited by 22 publications

References 13 publications

Increasing flux density by HTS shielding pellet in superconducting synchronous machine based on flux concentration

Increasing flux density by HTS shielding pellet in superconducting synchronous machine based on flux concentration

Effect of HTS shielding pellet on the performance of superconducting synchronous motor based on flux concentration

Analysis of Trapped Magnetic Field During Magnetization Process by Using SPA Method of Bulk Superconductor

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