Preliminary study on axial-type BSCCO superconducting motor

A small axial-type BSCCO high-T-c superconducting motor cooled with liquid nitrogen has been fabricated and tested in terms of speed, torque and speed -torque characteristic curves. BSCCO bulky disk is used to be 120 mm in dia meter and 8 mm thick, and two-pole concentrated armature winding is fed wit h the PWM inverter. The BSCCO machine could substantially operate as hyster esis motor. In the experimental motor, M-H characteristic curves at differe nt local points of the BSCCO disk were not same, air-gap magnetic flux dens ity was not completely sinusoidal, and viscosity losses existed due to liqu id nitrogen, so that the motor could not rotate at synchronous speed. Perfo rmances have been evaluated and an equivalent circuit of the BSCCO-2223 bul k motor has been estimated from test results. (C) 2001 Elsevier Science B.V . All rights reserved.