Numerical tools appear to be essential for modeling and designing devices based on superconducting materials. In this article different simulation results are presented, using a computer code based on the finite element method adopted for the resolution of the electromagnetic equations, in the case of an axisymmetric two-dimensional problem, with this code we study the variations of the different electromagnetic quantities. The second generation superconductor has been modeled as an interesting diamagnetic material as inductive pulse sources. The performance in magnetic field resistance, energy storage and thermal stability of the ribbon, known as YBCO, makes it possible to broaden its field of application. Two categories of machines have been proposed and analyzed, the first is classic and the second uses a superconducting ribbon. In addition, a comparative study between the two proposed models is carried out and the results are analyzed and discussed.
International audienceIn this paper, numerical simulations of trapped field and temperature rise in a bulk superconductor during magnetization process are studied. The pulsed field magnetization method and the modified multi-pulse technique with stepwise cooling are presented. We adopt the control volume method for solving the thermomagnetic system describing the physical phenomena. The electromagnetic fields and temperature are computed because of an explicit algorithm. The results are compared with published experimental results and show a good concordance
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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