The Design of a Lightweight HTS Synchronous Generator Cooled by Subcooled Liquid Nitrogen

Bailey, Wendell; Al-Mosawi, M.K.; Yang, Y.; Goddard, K.F.; Beduz, C.

doi:10.1109/tasc.2009.2017841

Cited by 12 publications

(10 citation statements)

References 5 publications

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“…Thus, the estimated heat transfer through the TTE is ∼10 W which is comparable to the design from (105,118) where TTE was made from composite material (G10) and 60W of heat in total was estimated for 77 K. The table includes the heat transfer estimate for the top shaft. This is included because the cryostat is operated as open LN 2 bath and the HTS field winding had the shaft as a top TTE.…”

Section: Cryostatmentioning

confidence: 70%

Superconducting wind turbine generators

Abrahamsen¹,

Mijatović

Seiler³

et al. 2010

Supercond. Sci. Technol.

192

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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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Section: Cryostatmentioning

confidence: 70%

Superconducting wind turbine generators

Abrahamsen¹,

Mijatović

Seiler³

et al. 2010

Supercond. Sci. Technol.

192

View full text Add to dashboard Cite

show abstract

“…Equi-efficiency lines can also be drawn according to (6), representing the same dB O /dC M in these complex curves. Thus, the equi-efficiency lines do not remain circular, if the length of end turns are considered.…”

Section: B End Segments Penaltymentioning

confidence: 99%

“…4(e)] has taken the end turns penalty of material consumption into consideration. The outline is calculated according to (6), and an operating current of 210 A is set for ease of comparison. The peak magnetic field at target position is 2.0 T. The maximum value of magnetic field amplitude, perpendicular component of field and field at Θ = 60 • are 4.48 T, 2.60 T, and 3.66 T, respectively.…”

Section: B Stepped Cross-sectional Shape Magnetmentioning

confidence: 99%

“…As the power capacity of an electric rotating machine is generally proportional to the peak value of gap field B g , HTS mag- nets are mostly used as field windings in the rotor for increasing B g , such as the 36.5 MW ship propulsion motor of American Superconductor Corporation (AMSC) [1], the 400 kW and 4 MW motors of Siemens [2], [3], and the 100 kW HTS generator of the University of Southampton [4]- [6]. Several 10 MW class generators have also been designed by AMSC for future wind farms [7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design and Optimization of High‐Temperature Superconducting Racetrack Magnet for the Rotor of a 100‐kW Generator

et al. 2015

IEEE Trans. Appl. Supercond.

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Concept design and optimization for a hightemperature superconducting (HTS) rotor of a 100-kW generator is studied in this paper. The rotor has eight HTS magnets constructed by air-cored racetrack coils. The HTS magnets with a unique circular cross-sectional shape can produce a gap field over 2.0 T. The present design is based on a new graphical method developed to estimate the maximum operating current of an HTS magnet that takes both I c -B characteristics and angular dependence into consideration. The optimized stepped shape design saved more than 8% of the HTS material compared with the rectangular one without sacrificing the gap field.

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“…The iron core helped to overcome the shortfalls in the BSCCO HTS tapes available at the time, enabling us to retain a sensible air-gap flux density and to operate at 77 K. The iron core also provided a solid frame from which to support the HTS coils, flux diverters, the cold copper shield to reduce harmonic losses, the cooling infrastructure and the torque tubes. A simple and lightweight cryostat design was proposed in [5], which would overcome the problems of supporting the important rotor features. This paper begins by describing the construction of the cryostat, the winding and the final assembly with the torque tubes and pole pieces.…”

Section: Introductionmentioning

confidence: 99%

Testing of a Lightweight Coreless HTS Synchronous Generator Cooled by Subcooled Liquid Nitrogen

Bailey

Wen

Al-Mosawi

et al. 2011

IEEE Trans. Appl. Supercond.

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A lightweight 'coreless' (100 kW), 2-pole HTS rotor, designed and built at the University of Southampton has been completed and is now in the testing phase of the project. By removing the iron core from the new cold rotor, the weight has been halved in comparison to the previous rotor. The 'cold' components of the rotor assembly make up a sixth of the total weight, which has provided significant time and cost savings in the cool down process. A lightweight doughnut shaped cryostat houses the HTS winding. The winding itself is constructed from sixteen double pancake coils, wound from BSCCO HTS tape. Practical testing of the generator began with a series of stationary tests. The critical current of the HTS winding is 77 A at liquid nitrogen temperature (77.4 K) and increases to 156 A, when cooled with liquid air (61.6 K). The air-gap flux density is 0.3 T at 156 A. The machines total harmonic distortion (THD) was predicted to be around 5.4% with the measured and this despite using an unoptimized stator. Finally, the synchronous reactance, was evaluated to be 0.24 p.u. This is a 1/5 of the value found for conventional synchronous machines and is largely due to its air-core structure.

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The Design of a Lightweight HTS Synchronous Generator Cooled by Subcooled Liquid Nitrogen

Cited by 12 publications

References 5 publications

Superconducting wind turbine generators

Superconducting wind turbine generators

Design and Optimization of High‐Temperature Superconducting Racetrack Magnet for the Rotor of a 100‐kW Generator

Testing of a Lightweight Coreless HTS Synchronous Generator Cooled by Subcooled Liquid Nitrogen

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