低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
57 巻, 2 号
選択された号の論文の9件中1~9を表示しています
巻頭言
特集:電力・産業応用に向けて加速する超電導回転機技術
解説
  • 寺尾 悠, 大崎 博之
    2022 年 57 巻 2 号 p. 71-78
    発行日: 2022年
    公開日: 2022/03/20
    ジャーナル フリー

    This paper describes the technological trend of superconducting rotating machines for future electric aircraft propulsion systems. In order to realize these systems and replace the state-of-the-art turbofan engines in aviation systems, lightweight electric equipment such as motor/generators of 16 kW/kg or higher and power converters of 19 kW/kg or higher are required. Since superconducting wires have a higher current density than copper wires, they have the potential to realize such high-power density rotating machines. Therefore, there are many research groups studying the superconducting rotating machines for future electric aircraft systems. This review will introduce not only the research trends of superconducting rotating machines and systems, but also the state-of-the-art motors and hybrid aviation systems.

  • 和泉 充
    2022 年 57 巻 2 号 p. 79-86
    発行日: 2022年
    公開日: 2022/03/20
    ジャーナル フリー

    Energy and environment have been extremely highlighted, since we are obliged to challenge to sustain the development of a world community against climate change. Rotating machinery provides motors or generators for use in power bases, various industries, transportation mobility in logistics. The growing population and economy make it necessary to eliminate the dependence on fossil fuels. Our team has engaged in the intensive study of superconducting rotating machinery under industry-academia collaborations. In the course of our works, the team studied the field poles and the ship propulsion motor by using 1G HTS wire. Separately, we have conducted a successive study to prove the viability of a machine with field poles composed of Gd-123 HTS bulks. Both the design and construction were carried out in TUMSAT. The machines have been studied for durability and survivability. We provide a brief review of the publicized studies of us on the HTS rotating machinery and try to concrete a potential application of HTS rotating machinery to ship propulsion and renewable energy such as marine current turbines. The concept may contribute to improving the local power supply sources on the coast and islands by reducing the environmental damage.

  • 福井 聡
    2022 年 57 巻 2 号 p. 87-100
    発行日: 2022年
    公開日: 2022/03/20
    ジャーナル フリー

    As a climate change countermeasure to limit the average temperature increase from pre-industrial times below 1.5 ℃, various efforts are being made to reach the neutrality of greenhouse gases by 2050. To realize the worldwide carbon neutrality, the extensive utilization of renewable energies is one of the key solutions. Among renewable energies, the wind power generation has the advantage of low generation cost and high capacity factor. The world's installed wind power capacity has reached 651 GW by the end of 2019 including the new installations of 60.4 GW. The annual growth rate in 2019 was about 9 %. The market for wind power generation is steadily expanding and various technologies are being actively developed. This article begins with the summary of the technology trends and transitions in large-scale wind power generation. As a representative and successful example of the recent HTS wind turbine generator developments, the results of the EcoSwing project are reviewed. According to the achievements of the EcoSwing project, the technology status of HTS wind turbine generators is discussed.

テーマ解説
研究論文
  • 佐々木 修平, 宮崎 純, 大島 悠太, 佐藤 航大
    2022 年 57 巻 2 号 p. 109-115
    発行日: 2022年
    公開日: 2022/03/20
    ジャーナル フリー

    Currently, renewable energy has been attracting attention as a tool to resolve various environmental and energy issues. However, renewable energy cannot provide a stable power supply due to the influence of the climate. Therefore, we are aiming to develop a “Multiple energy storage system” using the superconductor (SC) to compensate for the fluctuating power. In previous research, we demonstrated the magnetic levitation of permanent magnets (PMs) on both sides of the SC and rotational motion by exciting coil. However, we found out that it was difficult to increase the capacity of the system by a single SC. In this paper, we investigated the possibility of using multiple SCs for magnetic levitation of larger PMs (rotating bodies). In addition, we attempted to suppress the vibration of the rotating bodies during rotation. As a result, the magnetic levitation and rotation of the large PMs in this system was successfully realized. Then, an SC coil reduced the characteristic variation of the multiple SCs and suppressed the vibration of the rotating bodies. Therefore, the experiment showed that it was possible to build a large-scale system.

機器/技術紹介
研究/事業グループ紹介
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