Pulsed-field magnetization study for Gd123 bulk HTS cooled with condensed neon for axial-gap type synchronous motor

The closed-cycled refrigeration of neon by using a GM cryocooler has successfully provided a low-temperature pulsed-field magnetization at 38 K for field-pole Gd123 bulks in the testing rotating machine. Upon magnetization, a new split-type of armature coil, Controlled Magnetic field density Distribution Coil (CMDC) was employed. The CMDC has realized a control of magnetic field by choosing effective diameter of the vortex coil either 44 mm or 84 mm for the sample with 60 mm in diameter. The maximum trapped magnetic flux density reached over 1.3 T at 1.3 mm from the surface of bulk. 2.5 times larger flux was obtained for the field pole bulk in contrast to the liquid nitrogen cooling. The output of the motor was enhanced to 25 kW associated with a practical closed-cycle cooling without a liquid cryogen.