ON THE DESIGN OF ARMATURE WINDING OF LARGE SUPERCONDUCTING SYNCHRONOUS MACHINE.

Armature winding problems for a large superconducting synchronous generator are studied. The higher flux density produced by the superconducting field winding, increase in the space for the armature conductors owing to the absence of iron, and reduction of insulation requirements allow better utilization of space and materials. To reduce the eddy current loss and ohmic loss in the armature winding, the conductor has an optimum size. Round strand conductors, with individual wires each having a diameter of approximately 1 mm, are adopted. Plastics (epoxy/glass, etc. ) are widely used as structural materials, but problems of their elastic hysteresis are not solved yet. The key or wedge system is considered to be suitable for structural bracing of the armature winding. The current density rating is determined not only by the heating loss, but also by the value of reactance in some cases. Some methods of winding are proposed to generate higher terminal voltages so that the first transformer is dispensed with.