Rotating machines with high-temperature superconductors (HTS) usually consist of
pole-field magnets having coils wound with Bi-2223 HTS wire. We have successfully used
Gd–Ba–Cu–O bulk HTS in pole-field magnets in an axial-gap type rotating machine. These
HTS pole-field bulk magnets were assembled in the rotor plate. They are cooled down with
a liquid cryogen supplied via a rotary joint and circulated inside the rotor plate. The
present design provides a small air gap and a bulk HTS gives a high magnetic field around
the armature coils. Successful mechanical design has enabled us to magnetize the pole-field
bulk to more than 1 T by using a pulsed current applied to the copper armature coils.
These techniques imply the possibility of smaller and lighter rotating motors or generators
with a HTS bulk magnet for a sub-megawatt class propulsion system. We report several
essential techniques for both mechanical and cryogenic designs, and deduce the
characteristic features of the present axial-gap type machine using a HTS bulk magnet.
For the buckling mechanism, fracture would occur in a wider area of the orbital floor when striking force was directed upward than when the force was horizontally directed. This finding would be helpful in predicting fracture width in blowout fractures.
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