After develop of the first machine, SCGs of rotating
field types have been developed animatedly in many
countries. The fundamental structure was defined as
shown Fig. 1. Liq.He is supplied through the transfer
coupling to inside of rotor. Evaporated gaseous helium
cools torque tube and radiation shield (cold damper).
After that, the gas goes out of generator through the
transfer coupling. The rotor consists of helium accumulating
space, coil retaining cylinder, vacuum space,
radiation shield (cold damper), vacuum space and warm
damper. The stater consists of air-gap armature winding
and machine shield.