Experimental study of a new kind of superconducting inductor

Masson, Philippe; Lévêque, Jean; Netter, Denis; Rezzoug, A.

doi:10.1109/tasc.2003.813055

Cited by 26 publications

(24 citation statements)

References 6 publications

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“…A good agreement is obtained for the angular positions S1, S5, S7 and S9. The difference between the calculated and measured [5] flux density for the angular positions S2, S3, S4, S6, S8 and S10 is due that the measured positions which are lower than the calculated radius 33 mm. In order to optimize the shielding pellet dimensions to have In order to optimize the shielding pellet dimensions to have a maximum flux density in the air-gap of the machine and between each pair of the shielding bulks, we introduced several dimensions of the pellet.…”

Section: Resultsmentioning

confidence: 77%

“…To validate the numerical model, we used the experimental data of the previous topology of the inductor (without pellet) giving the magnetic flux density versus the angular position numbered from S1 to S10 [5].…”

Section: Resultsmentioning

confidence: 99%

“…To calculate the magnetic flux density in the design, we calculate the magnetic scalar potential V from using the Coulomb model of coils [5]. The calculation of the gradient of the potential gives the magnetic field.…”

Section: Magnetic Modelmentioning

confidence: 99%

“…. 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.…”

Section: Introductionmentioning

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: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Section: Magnetic Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…By combining these last possibilities, several inductor structures of synchronous machines can be considered. The principle is based on the modulation of the magnetic field obtained by the exciting coils using superconducting screens [3]- [5]. High air-gap flux density values are achieved which result in compact machines suitable in marine, wind turbine and aircraft industries [2], [3]- [6].…”

Section: Introductionmentioning

confidence: 99%

3D Magnetic field modeling of a new superconducting synchronous machine using reluctance network method

Kelouaz

Ouazir

Hadjout

et al. 2018

Physica C: Superconductivity and its Applications

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-In this paper a new superconducting inductor topology intended for synchronous machine is presented. The studied machine has a standard 3-phase armature and a new kind of 2-poles inductor (claw-pole structure) excited by two coaxial superconducting coils. The air-gap spatial variation of the radial flux density is obtained by inserting a superconducting bulk which deviates the magnetic field due to the coils. The complex geometry of this inductor usually needs 3D finite elements (FEM) for its analysis. However, to avoid a long computational time inherent to 3D FEM, we propose in this work an alternative modeling which uses a 3D meshed reluctance network. The results obtained with the developed model are compared to 3D FEM computations as well as to measurements carried out on a laboratory prototype. Finally, a 3D FEM study of the shielding properties of the superconducting screen demonstrates the suitability of using a diamagnetic-like model of the superconducting screen.

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Improvement of YBCO Superconductor Magnetic Shielding by Using Multiple Bulks

Douine

Male

Lubin

et al. 2013

J Supercond Nov Magn

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International audienceHTS bulks present a high critical current density which can be used as magnetic shields. Previous works showed that BSCCO bulks can screen magnetic fields up to 0.1 T. For large scale applications like electrical machines, stronger magnetic field is usually needed. In so doing, (RE)BCO materials are more suitable since they can shield much higher magnetic fields. Another key issue concerns the size of the bulks. Nowadays, it is possible to manufacture 150-mm diameter class cylindrical YBCO bulk. In order to get larger magnetic shielding areas, multiple bulk superconductors should be arrayed and stacked in layers. This paper presents experimental results on screening performances of layered YBCO pellets. These results are compared with 2D simulations. The experiments are carried out at 77 K under external magnetic fields of 150 mT. Different topologies are considered: single-layer configuration with 9 square pellets and double-layer configuration with respectively 9 and 4 square pellets. Experimental and simulation results show that a checkerboard of one layer configuration does not fully shield the external magnetic field. Improved shielding properties are obtained when the double-layer configuration is used

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Experimental study of a new kind of superconducting inductor

Cited by 26 publications

References 6 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

3D Magnetic field modeling of a new superconducting synchronous machine using reluctance network method

Improvement of YBCO Superconductor Magnetic Shielding by Using Multiple Bulks

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