Abstract
Superconducting generators (SCG) show the potential to reduce the head mass of large offshore wind turbines. By evaluating the availability and required cooling capacity in the temperatures range around 20 K, a Gifford-McMahon (GM) cryocooler among all the candidates was selected. The cold head of GM cryocooler is supposed to rotate together with the rotating superconducting coil. However, the scroll compressor of the GM cryocooler must stay stationary due to lubricating oil. As a consequence, a rotary helium union (RHU) utilizing Ferrofluidic® sealing technology was successfully developed to transfer helium gas between the rotating cold head and stationary helium compressor at ambient temperatures. It contains a high-pressure and low-pressure helium path with multiple ports, respectively. Besides the helium line, slip rings with optical fiber channels are also integrated into this RHU to transfer current and measurement signals. With promising preliminary test results, the RHU will be installed in a demonstrator of SCG and further performance investigation will be performed.
Highlights
Offshore superconducting wind turbines show the potential to reduce weight and size due to the high magnetic field and low current loss of using high temperature superconductors (HTS)
With promising preliminary test results, the rotary helium union (RHU) will be installed in a demonstrator of Superconducting generators (SCG) and further performance investigation will be performed
HTS applied in the wind turbine work at cryogenic temperatures
Summary
To cite this article: Jiuce Sun et al 2017 IOP Conf. - Development of a valved non-lubricated linear compressor for compact 2K GiffordMcMahon cryocoolers Y Hiratsuka, Q Bao and M Xu. - Development of a cryocooler vibrationreduction system Takayuki Tomaru, Toshikazu Suzuki, Tomiyoshi Haruyama et al. - Development of a dry linear compressor for GM and pulse tube cryocoolers J Hoehne. View the article online for updates and enhancements. This content was downloaded from IP address 212.142.140.173 on 14/11/2018 at 09:40
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IOP Conference Series: Materials Science and Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
