A study on stabilities of rotating magnets for superconducting generators

✍ Scribed by Noboru Higuchi; Katsuyuki Kaiho; Itaru Ishii; Seiji Sekine; Naotake Natori; Kazuaki Arai; Harehiko Nomura; Hiroshi Tateishi; Toshitada Onishi

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 557 KB
• Volume: 1
• Category: Article
• ISSN: 0964-1807
• DOI: 10.1016/0964-1807(93)90322-s

✦ Synopsis

Stabilities of magnets in a high gravitational field up to 2000G at a rotating speed of 3,60Orpm, are studied to establish the fundamental design criterion of field windings of superconducting generators.

It is clarified that magnet stability is greatly improved in a rotational field compared with stationary state, because of the enhancement of natural convection for the cooling of the coils caused by a high gravity.

Heat transfer to liquid helium (LHe) are measured using a clean copper and a Formvar coated cop er under rotational field.

The coefficients are 0.7x104Wm-$ K-1 and 0.4x104Wm-2K-lat the gravitational field of about lOOOG, respectively.

They are almost identical to the calculated values based on the normal zone propagation velocities under the same condition.