TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
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Volume 51, Issue 5
Displaying 1-7 of 7 articles from this issue
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Preface
Feature: Current Status and Future Outlook of High Temperature Superconducting
Review Article
  • Fundamentals of R&D for Superconducting Electric Rotating Machinery
    ― High-temperature Superconducting Generators and Motors ―
    Itsuya MUTA
    2016 Volume 51 Issue 5 Pages 147-154
    Published: May 25, 2016
    Released on J-STAGE: June 22, 2016
    DOIhttps://doi.org/10.2221/jcsj.51.147
    JOURNAL FREE ACCESS
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    It is said that extensive CO2 emissions is a well-known cause for the crucial temperature rise the Earth is experiencing, so all people of the world need to devise a good way to reduce global CO2 emissions. One mean is to utilize some technologies to improve the efficiency of electrical equipment, such as that used for electric- power generation and power machinery. One of the most effective technologies is thought to be the application of high-temperature superconductivity so as to improve energy conversion efficiency based on the zero resistivity of superconductive winding conductors, together with the use of low iron loss magnetic materials. This paper clarifies a theoretical design philosophy for high-efficiency, small-size and lightweight electric rotating machinery, and reports on a survey of the current status of R&D regarding high-temperature superconducting (HTS) electric rotating machinery. In addition, the paper discusses observations regarding the ulterior solvents for successfully and actually manufacturing HTS electric machinery.
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Focused Reviews
  • Research and Development of Fully Superconducting Motors for Liquid-hydrogen Transfer Pumps
    Kazuhiro KAJIKAWA, Taketsune NAKAMURA, Hiroaki KOBAYASHI
    2016 Volume 51 Issue 5 Pages 155-163
    Published: May 25, 2016
    Released on J-STAGE: June 22, 2016
    DOIhttps://doi.org/10.2221/jcsj.51.155
    JOURNAL FREE ACCESS
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    The research and development conducted regarding fully superconducting motors for liquid-hydrogen transfer pumps using MgB2 monofilamentary wires are gathered into this paper. Synchronous rotation without slip can be realized using squirrelcage-type rotor windings composed of quasi-superconducting loops soldered between MgB2 wires, thereby enabling superconducting motors with low loss and high efficiency to be achieved. The use of MgB2 wires for stator windings also enables the primary winding loss to be reduced drastically compared to conventional copper winding. The transfer of liquid hydrogen from a metal cryostat containing the fabricated MgB2 motor to a glass Dewar vessel for visual monitoring is demonstrated successfully.
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  • Development of Stirling Cryocooler for Electric Bus Superconducting Motor
    Kenta YUMOTO, Kyosuke NAKANO, Yoshikatsu HIRATSUKA
    2016 Volume 51 Issue 5 Pages 164-170
    Published: May 25, 2016
    Released on J-STAGE: June 22, 2016
    DOIhttps://doi.org/10.2221/jcsj.51.164
    JOURNAL FREE ACCESS
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    Recently, practical applications of high-temperature superconducting (HTS) wires are being promoted. Superconducting motor is one of the application for HTS wires, with the advantage of expected higher efficiency. As the performance of the wire was improved, the development of a superconducting motor has been actively conducted. To demonstrate the higher efficiency of electric vehicles driven by a superconducting motor, the development of a superconducting motor and its cooling system has been performed through the joint research of Sumitomo Heavy Industries, Ltd. (SHI) and Sumitomo Electric Industries, Ltd. (SEI). To improve the total efficiency of a superconducting motor system, it is vital to improve cryocooler performance. In this project, SHI developed a high-efficiency Stirling cryocooler and performance tests were conducted. As a result, a cooling capacity of 151 W at 70 K with a compressor input power of 2.15 kW corresponding to a COP of 0.07, was achieved. Actual vehicle testing was also conducted. The results of tests and simulations showed that it is possible to increase efficiency about 10% compared to a conventional electric motor.
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