Abstract
Studies on ihc application of superconductivity to industrial motors did not take place until the 1970s 1:1]-1:41a, decade after practical, niobium alloy based conductors became available in 1961. The development effort on 10w-T~motors and generators peaked in the late 1970s and enrly 1981)s L51, [GI and continued until k French collaboration recently tested B I50 kW, low speed (400 rpm), permanent magnetic motor with a superconducting armature. The low-Tc tnnterials are limited to operation somewhere below 20 K, and most applications use liquid helium at 4.2 K as the refrigerant.
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