Design and Testing of Real-Scale MgB2 Coils for SUPRAPOWER 10-MW Wind Generators

Superconducting MgB
₂
coils have a promising application niche in large wind generators. The potential implementation as field coils results in machines with smaller size and reduced weight, which is a real benefit compared to conventional nonsuperconducting alternatives. This is a key factor where the wind market demands higher power rate and more compact turbines in order to optimize capital and operational costs. Under the SUPRAPOWER project, a 10-MW direct-drive wind generator concept will be probed through an experimental validator, with superconducting rotating dc coils. For the required temperature, current density, and magnetic field, the available commercial MgB
₂
wire has been selected, as it is cost effective and well suited compared to other solutions. The aim of the present work is to analyze the operational conditions of MgB
₂
dc field coils, which are cryogen-free cooled and developed in accordance with SUPRAPOWER generator requirements. This paper deals with the design, manufacturing, and experimental results of full-scale superconducting coils.