超電導発電機回転子におけるヘリウムの挙動
1982 年 17 巻 1 号 p. 2-9
詳細
1982 年 17 巻 1 号 p. 2-9
This paper reviews the fundamental thermodynamic behaviors of helium in superconducting rotating machine.
Helium in a large diameter rotor of a superconducting generator would suffer the high centrifugal acceleration which ranges in several thousands fold normal gravity. In such a high centrifugal field, helium temperature near rotor periphery would rise due to the adiabatic compression. This temperature rise could seriously impair the current carrying capability of superconducting field winding especially in large diameter rotor. However, provided to arrange the helium coolant circuit appropriately in a rotor, one could realize the condition which would be favorable for the superconducting winding even in high speed rotor with large diameter.
The thermosiphon effect and the self-pumping effect which are strongly related to the rotation would affect on the helium flow actively in a circuit and could offset the temperature rise resulting from compression of the helium in the rotor body. The several examples for the realization of these effects in helium management system inside rotors and the related problems are also described.
