Proposal of a Fully Superconducting Motor for
Liquid Hydrogen Pump with MgB₂ Wire

Kazuhiro Kajikawa and Taketsune Nakamura

Abstract—The outline design of a fully superconducting motor for liquid hydrogen pump with a magnesium-diboride (MgB₂ ) superconducting wire is carried out to present various advantages arising from its prospective performances. Thesquirrel-cage rotor winding composed of superconducting loops with the MgB₂ wire enables us to operate the motor not only in a slip mode but also in a synchronous rotation mode, and consequently the rotor winding loss can be suppressed drastically. Furthermore, it would be expected that the stator winding loss becomes smalle rby using the MgB₂ wire compared with familia rnormal metals as typified by a copper. The time evolution of magnetic field distribution around the stator winding is obtained by means of a finite element analysis in order to estimate the AC loss and the primary circuit resistance.

IndexTerms—Liquid hydrogen, magnesium diboride, super-conducting motor ,transfer line.

Manuscript received19 August 2008.
This work was supported by the Industrial Technology Research Grant Program in 2008 (08B38006a) from the New Energy and Industrial Technology Development Organization (NEDO) of Japan.
K. Kajikawa is with the Research Institute of Superconductor Science and Systems, Kyushu University, Fukuoka 819-0395, Japan (corresponding author to provide phone: +81-92-802-3836; fax: +81-92-802-3829; e-mail:kajikawa@sc.kyushu-u.ac.jp).
T. Nakamura is with the Department of Electrical Engineering, Kyoto University, Kyoto 615-8510, Japan.

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