High temperature superconducting demonstration synchronous generator with a coreless rotor: design, build and test

在过去的几年中，美国已经将大量资金用于高温超导在电动机和发电机中的应用，特别是在海军中的应用。在英国，我们是唯一一家能够在这种有前途的电力应用技术方面取得重大进展的集团。我们建议在以前的赠款GR/N21253/01下取得的成就的基础上，通过设计和建造无芯转子（使用相同的定子），从HTS带材技术的巨大改进中受益。基于仔细的现场建模的初步估计表明，转子的重量至少可以节省60%，并且我们有信心，如在以前的设计中一样，我们可以使用液氮或空气冷却（在64 K下）实现必要的场，而不需要将温度降低到25- 30 K，这是其他设计中的标准方法，但会显著降低低温效率。无芯设计/这是高温超导电机设计的最终目标/将成为可能，这要归功于我们创新使用的通量分流器，该通量分流器保护BSCCO带材免受过度磁场的影响;当具有更好磁场性能的超导体可用时，这种分流器将不再必要。我们认为HTS技术已经成熟到可以尝试下一代演示器（如本提案中所建议的演示器）的水平。

In the past couple of years significant funding has been directed in the USA towards applications of high temperature superconductivity for electric motors and generators, especially in naval applications. In the UK we are the only group which can claim significant advances in this promising technology for power applications. We propose to build on our achievements under the previous grant GR/N21253/01, and benefit from the dramatic improvements in the technology of HTS tapes, by designing and building a coreless rotor (using the same stator). Preliminary estimates based on careful field modelling suggest that savings in weight of the rotor of at least 60% should be expected and we are confident, as in the previous design, that we can achieve necessary fields using liquid nitrogen or air cooling (at 64K) without the need to reduce the temperatures to 25-30K, which is the standard approach in other designs but which reduces significantly cryogenic efficiency. The coreless design / which is the ultimate goal in the design of HTS machines / will be possible thanks to our innovative use of flux diverters which protect BSCCO tapes from excessive fields; such diverters will not be necessary when superconductors with better field performance become available. We consider the HTS technology to have matured to the level that that the next generation demonstrators, like the one suggested in this proposal, can be attempted.