Preliminary study on a rotating armature type superconducting motor

A rotating armature type motor with a laboratory made four pole saddle shape superconducting field winding has been constructed. Cool-down tests were carried out successfully several times. By the motor operating as a generator under no load and resistive load conditions, machine constants are obtained. The air gap field with outer magnetic shield yoke is 29% higher than without yoke. The field coil could stand current up to 120 A. The rated terminal voltage should be 220 V for 1800 rpm (at 90 A field current). The armature coil could stand current up to 50 A, with a rated armature current value of 40 A corresponding to 15 kW at 0.98 power factor. Moreover the experimental and theoretical characteristics of the motor will be presented