Airgap winding for large turbogenerators

Davies, E.J.

doi:10.1049/piee.1971.0091

Cited by 7 publications

(5 citation statements)

References 1 publication

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“…• Reduction of dissipation caused by ferromagnetic teeth (198) • Additional space for armature winding (65,193) i.e. higher electric loading of armature (A s from 3.1)…”

Section: Details About Hts Coilsmentioning

confidence: 99%

Superconducting wind turbine generators

Abrahamsen¹,

Mijatović

Seiler³

et al. 2010

Supercond. Sci. Technol.

197

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We have examined the potential of 10 MW superconducting direct drive generators to enter the European offshore wind power market and estimated that the production of about 1200 superconducting turbines until 2030 would correspond to 10% of the EU offshore market. The expected properties of future offshore turbines of 8 and 10 MW have been determined from an up-scaling of an existing 5 MW turbine and the necessary properties of the superconducting drive train are discussed. We have found that the absence of the gear box is the main benefit and the reduced weight and size is secondary. However, the main challenge of the superconducting direct drive technology is to prove that the reliability is superior to the alternative drive trains based on gearboxes or permanent magnets. A strategy of successive testing of superconducting direct drive trains in real wind turbines of 10 kW, 100 kW, 1 MW and 10 MW is suggested to secure the accumulation of reliability experience. Finally, the quantities of high temperature superconducting tape needed for a 10 kW and an extreme high field 10 MW generator are found to be 7.5 km and 1500 km, respectively. A more realistic estimate is 200–300 km of tape per 10 MW generator and it is concluded that the present production capacity of coated conductors must be increased by a factor of 36 by 2020, resulting in a ten times lower price of the tape in order to reach a realistic price level for the superconducting drive train.

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“…• Reduction of dissipation caused by ferromagnetic teeth (198) • Additional space for armature winding (65,193) i.e. higher electric loading of armature (A s from 3.1)…”

Section: Details About Hts Coilsmentioning

confidence: 99%

Superconducting wind turbine generators

Abrahamsen¹,

Mijatović

Seiler³

et al. 2010

Supercond. Sci. Technol.

197

View full text Add to dashboard Cite

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“…Some arguments in favor of the air-gap armature design are removal of teeth saturation and higher armature current loadings. The advantages of air-gap armature windings have not yet been proven commercially and it was reported [6] that the air-gap armature winding involves several challenges, which still needed to be addressed e.g. cooling, mechanical integrity, assembly, and eddy current loss.…”

Section: A Hts Machine Designmentioning

confidence: 99%

“…data, is not standardized and is highly dependent on several parameters. In order to compare different types of HTS tapes, the data from published material [6]-[9] is used in this study together with estimated price ratios for the HTS tapes, Fig. 3.…”

Section: B Hts Coil Designmentioning

confidence: 99%

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Coil Optimization for High Temperature Superconductor Machines

Mijatović

Jensen

Abrahamsen

et al. 2011

IEEE Trans. Appl. Supercond.

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Abstract-This paper presents topology optimization of HTS racetrack coils for large HTS synchronous machines. The topology optimization is used to acquire optimal coil designs for the excitation system of 3 T HTS machines. Several tapes are evaluated and the optimization results are discussed.The optimization algorithm is formulated to minimize the cost for the coils wound with one type of HTS as well as multiple HTS types. It could also be used to minimize other parameters, e.g. space required for the coils. The results are inherently highly dependent on the HTS properties, which at 20 K seem to be in favor of the 1 G tape. The maximal HTS savings achieved allowing multiple current supplies in the excitation system are investigated and estimated to be in the range of 50% for highly nonlinear J-B dependence HTS tapes.

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“…Après avoir déterminé les expressions des grandeurs caractérisant le fonctionnement de la machine, nous procédons enfin à la validation de ce calcul, en confrontant les résultats obtenus avec ceux issus de l'expérience. 1. Bases de la modélisation.…”

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