Progress Toward Megawatt Class Superconducting Generators which Operate at Greater than 20 Kelvin

Oberly, C. E.; Joshi, C.H.; Rodenbush, A. J.; Young, Steven J.; Long, L. J.; Kozlowski, Gregory

doi:10.1007/978-1-4615-2522-6_115

Cited by 5 publications

(1 citation statement)

References 13 publications

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“…Its field windings are manufactured by ASC from HTS wire and provide 72 000 A turns at 1.5 T and 20 K. The project's perspectives are to reduce further the weight and size of the generator by increasing the magnetic flux. As the magnetic induction greatly exceeds the saturation of magnetic materials the high density iron is replaced by structures of aluminium and fibre-reinforced composite [3].…”

Section: Us Airforce Generator Demonstrationmentioning

confidence: 99%

Development of synchronous motors and generators with HTS field windings

Papst¹,

Gamble

Rodenbush

et al. 1997

Supercond. Sci. Technol.

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Synchronous machines with superconducting field windings offer reduced losses, size and weight. Continuous advances in the HTS conductor development at American Superconductor Corporation enable the demonstration of machines with increasing power. The latest achievements include a > 200 h.p. (150 kW) motor operated on an inverter, built and tested at Reliance Electric Corporation, and coils for a 1 MW generator for airborne applications. The HTS coils provide MMFs of the order of 70 000 A turns per pole and operate between 20 and 27 K. At this temperature, gaseous helium or hydrogen is used as the coolant. The cooling is more efficient by a factor of 10 than for cooling systems required for LTS materials operating at liquid helium temperatures. The elevated operating temperature offers significant benefits for the overall efficiency as the coefficient of performance for removing the parasitic heat load (cryostat and current lead loss) is improved. On this path to commercially viable machine sizes, American Superconductor currently is developing and manufacturing HTS coils for a 1000 h.p. (750 kW) synchronous motor which will be delivered to Reliance Electric for demonstration in 1998.

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Section: Us Airforce Generator Demonstrationmentioning

confidence: 99%

Development of synchronous motors and generators with HTS field windings

Papst¹,

Gamble

Rodenbush

et al. 1997

Supercond. Sci. Technol.

View full text Add to dashboard Cite

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Test Results of Two Small, High-Temperature Superconducting Coils

Lue

Schwenterly

Luton

et al. 1994

Advances in Cryogenic Engineering Materials

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Prospects for HTS applications

1996

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High temperature superconductor (HTS) wire is rapidly maturing into a working material being produced in ever larger quantities and being used in more significant demonstrations and prototypes. Conductor is now produced routinely in several hundred meter lengths with reproducible results. Current density has progressed to a level suitable for demonstration of many applications. Wire strength has improved and large prototypes fabricated or under consideration using HTS include Superconducting Magnetic Energy Storage (SMES), rotating electrical machines including synchronous ac and dc homopolar motors and drives, generators and condensers, underground transmission cables, utility distribution equipment such as transformers and current limiters, commercial processing applications such as magnetic separation, and specialty magnets such as high field inserts. In this paper the requirements, progress toward these requirements, and the prospects for the future are reviewed.operational redundancy (i.e. no excess refrigeration capacity to handle outages), and is based on a discount rate of 13% and ten years of operation. The savings are calculated relative to the cost of cooling to 7 K. (A 7 K cold head temperature is considered necessary to maintain a Nb3Sn device at a 10 K maximum temperature.) It is clear from the shape of this curve why many HTS applications are being considered for operation in the range from 20 K to 40 K. It should be noted that savings in the cost of the refrigeration equipment are incremental to the benefit presented in Fig. 1. P m n t Value of Whding (6) 410 I

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Progress Toward Megawatt Class Superconducting Generators which Operate at Greater than 20 Kelvin

Cited by 5 publications

References 13 publications

Development of synchronous motors and generators with HTS field windings

Development of synchronous motors and generators with HTS field windings

Test Results of Two Small, High-Temperature Superconducting Coils

Prospects for HTS applications

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