An overview of rotating machine systems with high-temperature bulk superconductors

Zhou, Difan; Izumi, Mitsuru; Miki, M.; Felder, B.; Ida, Tetsuya; Kitano, Masahiko

doi:10.1088/0953-2048/25/10/103001

Cited by 121 publications

(83 citation statements)

References 93 publications

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“…1,2 As a result, these materials are attracting increasing interest for many applications in which they can act effectively as strong quasi-permanent magnets, including rotating machines 3 and stable magnetic levitation devices. 4 Bulk superconducting magnets consist typically of cylinders of 10-50 mm in diameter and 10-20 mm in height.…”

Section: Introductionmentioning

confidence: 99%

A flux extraction device to measure the magnetic moment of large samples; application to bulk superconductors

Egan

Philippe

Wera

et al. 2015

Review of Scientific Instruments

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Articles you may be interested inCompression of a magnetic flux in the intergrain medium of a YBa2Cu3O7 granular superconductor from magnetic and magnetoresistive measurements J. Appl. Phys. 110, 093918 (2011) We report the design and construction of a flux extraction device to measure the DC magnetic moment of large samples (i.e., several cm 3 ) at cryogenic temperature. The signal is constructed by integrating the electromotive force generated by two coils wound in series-opposition that move around the sample. We show that an octupole expansion of the magnetic vector potential can be used conveniently to treat near-field effects for this geometrical configuration. The resulting expansion is tested for the case of a large, permanently magnetized, type-II superconducting sample. The dimensions of the sensing coils are determined in such a way that the measurement is influenced by the dipole magnetic moment of the sample and not by moments of higher order, within userdetermined upper bounds. The device, which is able to measure magnetic moments in excess of 1 A m 2 (1000 emu), is validated by (i) a direct calibration experiment using a small coil driven by a known current and (ii) by comparison with the results of numerical calculations obtained previously using a flux measurement technique. The sensitivity of the device is demonstrated by the measurement of flux-creep relaxation of the magnetization in a large bulk superconductor sample at liquid nitrogen temperature (77 K). C 2015 AIP Publishing LLC. [http://dx

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Section: Introductionmentioning

confidence: 99%

A flux extraction device to measure the magnetic moment of large samples; application to bulk superconductors

Egan

Philippe

Wera

et al. 2015

Review of Scientific Instruments

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“…Because of the significant increase in both electrical and magnetic loading, they are smaller and lighter in structure [19] and have less energy consumption, leading to a reduced energy cost [20]. However, there are three major challenges which must be addressed before a large scale utilization can be obtained.…”

Section: An Indispensable Technology Development Of Htsg Wind Turbinementioning

confidence: 99%

Status of the technology development of large scale HTS generators for wind turbine

Le¹,

Kim²,

Kim³

et al. 2015

Progress in Superconductivity and Cryogenics

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Large wind turbine generators with high temperature superconductors (HTS) are in incessant development because of their advantages such as weight and volume reduction and the increased efficiency compared with conventional technologies. In addition, nowadays the wind turbine market is growing in a function of time, increasing the capacity and energy production of the wind farms installed and increasing the electrical power for the electrical generators installed. As a consequence, it is raising the wind power energy contribution for the global electricity demand. In this study, a forecast of wind energy development will be firstly emphasized, then it continue presenting a recent status of the technology development of large scale HTSG for wind power followed by an explanation of HTS wire trend, cryogenics cooling systems concept, HTS magnets field coil stability and other technological parts for optimization of HTS generator design -operating temperature, design topology, field coil shape and level cost of energy, as well. Finally, the most relevant projects and designs of HTS generators specifically for offshore wind power systems are also mentioned in this study.

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“…[1][2][3] However, the low thermal conductivity and poor mechanical stability limit their ability of trapping larger fields. [4][5][6] By improving the thermal stability and the internal mechanical strength, Tomita et al 7 measured that very high trapped magnetic flux density up to 17.24 T were achieved at 29K in bulk YBa 2 Cu 3 O 7−y samples.…”

Section: Introductionmentioning

confidence: 99%

Kim model for flux-pinning-induced stress in a long cylindrical superconductor

Zeng

Wang

et al. 2016

AIP Advances

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In this work, the flux-pinning-induced stress distribution in a circular cylinder of hightemperature superconductors is studied by adopting the Kim critical state model to describe the relationship between the magnetic flux density and induced current. Based on the plane strain approach, the analytic expressions of the radial and hoop stress in the cylinder are derived for the zero-field cooling and field cooling magnetization processes. It is shown that the stress distributions depend on the activation processes and the values of the dimensionless parameter p in the Kim model, and the overall maximums of the stresses appear at or near the center of the cylinder where cracking may be most likely initiated. In addition, the Kim model has wider applicability than the Bean model, and the influence of p on the stress depends on the activation process.

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An overview of rotating machine systems with high-temperature bulk superconductors

Cited by 121 publications

References 93 publications

A flux extraction device to measure the magnetic moment of large samples; application to bulk superconductors

A flux extraction device to measure the magnetic moment of large samples; application to bulk superconductors

Status of the technology development of large scale HTS generators for wind turbine

Kim model for flux-pinning-induced stress in a long cylindrical superconductor

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