Analysis of the outer electromagnetic shield of a superconducting turbine-generator

With reference to a superconductive synchronous generator the iron losses in the outer shield are evaluated, using the vector potential algorithm and the Poisson-like equation. The numerical results are compared with those obtained by means of a finite elements program. The temperature distribution in the shield is also determined. The thickness of the iron yoke is then optimized introducing another conductive cylinder outside it. The optimization is done with reference to the overall Joule losses in the shielding system.