Test equipment for a flywheel energy storage system using a magnetic bearing composed of superconducting coils and superconducting bulks

Ogata, Masafumi; Matsue, Hitoshi; Yamashita, Tomohisa; Hasegawa, Hitoshi; Nagashima, K.; Maeda, Tatsumi; Matsuoka, Taro; Mukoyama, S.; Shimizu, Hideki; Horiuchi, Shinichi

doi:10.1088/0953-2048/29/5/054002

Cited by 33 publications

(12 citation statements)

References 7 publications

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“…Superconducting YBa

(YBCO) open-cell foam samples [ 1 , 2 , 3 ] are interesting materials for a variety of applications (fault current limiters, trapped field magnets, space applications [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ]) due to their various, unique properties, which include low sample weight, a very effective oxygenation process, excellent thermal properties allowing for quick cooling, excellent mechanical properties, the possibility for easy shaping of the samples and straightforward upscaling of the sample size. The cooling effectivity, effective oxygenation and sample upscaling have previously been demonstrated in [ 3 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Parameters for Modelling of Superconducting Foams

et al. 2022

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Superconducting YBa2Cu3Oy (YBCO) foams were prepared using commercial open-cell, polyurethane foams as starting material to form ceramic Y2BaCuO5 foams which are then converted into superconducting YBCO by using the infiltration growth process. For modelling the superconducting and mechanical properties of the foam samples, a Kelvin-type cell may be employed as a first approach as reported in the literature for pure polyurethane foams. The results of a first modelling attempt in this direction are presented concerning an estimation of the possible trapped fields (TFs) and are compared to experimental results at 77 K. This simple modelling revealed already useful information concerning the best suited foam structure to realize large TF values, but it also became obvious that for various other parameters like magnetostriction, mechanical strength, percolative current flow and the details of the TF distribution, a refined model of a superconducting foam sample incorporating the real sample structure must be considered. Thus, a proper description of the specific microstructure of the superconducting YBCO foams is required. To obtain a set of reliable data, YBCO foam samples were investigated using optical microscopy, scanning electron microscopy and electron backscatter diffraction (EBSD). A variety of parameters including the size and shape of the cells and windows, the length and shape of the foam struts or ligaments and the respective intersection angles were determined to better describe the real foam structure. The investigation of the foam microstructures revealed not only the differences to the original polymer foams used as base material, but also provided further insights to the infiltration growth process via the large amount of internal surface in a foam sample.

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“…Superconducting YBa

Section: Introductionmentioning

confidence: 99%

Microstructural Parameters for Modelling of Superconducting Foams

et al. 2022

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“…As a typical type-II superconductor, YBaCuO bulk is also called the high temperature superconducting (HTS) bulk. And YBaCuO bulks are widely used in maglev bearing (Hull, 2000), flywheel storage (Ogata et al, 2016), and maglev vehicle (D’Ovidio et al, 2008; Deng et al, 2016b; Liang et al, 2019; Schultz et al, 2005; Sotelo et al, 2015; Wang et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Theoretical optimization and experimental verification of a non-contact damper for high temperature superconducting Maglev systems

Deng

Huang

et al. 2022

Journal of Vibration and Control

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High-temperature superconducting (HTS) maglev has excellent potential in high-speed transportation due to its capability of passive stabilization levitation. However, in applications, the vibration of maglev vehicle with a large amplitude will be triggered for some external incentives or interference owing to its weak damping characteristics. Hence, it is preferable and necessary to find a way to reduce the vibration without mechanical contact. In terms of mechanical structure, the HTS maglev system mainly consists of HTS bulks and permanent magnets guideway (PMG). Utilizing the magnetic field provided by PMG, we designed and assessed an electromagnetic shunt damper (EMSD) for the HTS maglev system, by which the vibrations can be attenuated without contact. At first, the parameters of EMSD were theoretically optimized, respectively. Second, according to the structure of the Halbach PMG, the experimental EMSD was presented. In this damper, two groups of coils in reverse series were set above the two magnetic poles of the PMG to get a large induced electromotive force. Eventually, the experimental results show that the vibrations of the HTS maglev model vehicle can be attenuated more than 80% in the resonance region when the designed EMSD was employed in the system. Namely, this non-contacting damper will highly enhance the dynamic characteristics of HTS maglev systems.

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“…Superconducting YBa 2 Cu 3 O y (YBCO) open-cell foam samples [1][2][3] are interesting materials for a variety of applications (fault current limiters, trapped field magnets, space applications [4][5][6][7][8][9][10]) due to their various, unique properties, which include low sample weight, a very effective oxygenation process, excellent thermal properties allowing for quick cooling, excellent mechanical properties, the possibility for easy shaping of the samples and straightforward upscaling of the sample size. The cooling effectivity, effective oxygenation and sample upscaling have previously been demonstrated in [3,11,12].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Parameters for Modelling of Superconducting Foams

Koblischka¹,

Koblischka-Veneva²,

Nouailhetas³

et al. 2022

Preprint

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Superconducting YBa2Cu3Oy (YBCO) foams were prepared using commercial open-cell, polyurethane foams as starting material to form ceramic Y2BaCuO5 (Y-211) foams which are then converted into superconducting YBCO by using the infiltration growth process. For modelling the superconducting and mechanical properties of the foam samples, a Kelvin-type cell may be employed as a first approach like done in the literature for pure polyurethane foams. However, for a refined model of a superconducting foam sample, the real sample structure must be considered. Thus, a proper description of the specific microstructure of the superconducting YBCO foams is required. A variety of parameters including the cell size and shape, the window size and shape, the length and shape of the foam struts or ligaments and the respective angles of intersection are used to describe the real foam structure. To obtain a set of reliable data, YBCO foam samples were investigated using optical microscopy, SEM and electron backscatter diffraction (EBSD). The detailed investigation of the foam microstructure reveals not only the differences to the polymeric foams used as base material, but also gives insight to details of the infiltration growth process via the increased surface amount in a foam sample.

show abstract

Test equipment for a flywheel energy storage system using a magnetic bearing composed of superconducting coils and superconducting bulks

Cited by 33 publications

References 7 publications

Microstructural Parameters for Modelling of Superconducting Foams

Microstructural Parameters for Modelling of Superconducting Foams

Theoretical optimization and experimental verification of a non-contact damper for high temperature superconducting Maglev systems

Microstructural Parameters for Modelling of Superconducting Foams

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