Browsing by Keyword "MgB coil"
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Item Design and Testing of Real-Scale MgB2 Coils for SUPRAPOWER 10-MW Wind Generators(2016-04) Sarmiento, G.; Sanz, Santiago; Pujana, A; Merino, Jose Maria; Marino, Iker; Tropeano, Matteo; Nardelli, Davide; Grasso, Gianni; Tecnalia Research & Innovation; DIGITAL ENERGYSuperconducting MgB2 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 MgB2 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 MgB2 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.Item Lightweight MgB2 superconducting 10 MW wind generator(2015-12-21) Marino, Iker; Pujana, Ainhoa; Sarmiento, G.; Sanz, Santiago; Merino, Jose Maria; Tropeano, Matteo; Sun, Jiuce; Canosa, T.; Tecnalia Research & Innovation; DIGITAL ENERGYThe offshore wind market demands a higher power rate and more reliable turbines in order to optimize capital and operational costs. The state-of-the-art shows that both geared and direct-drive conventional generators are difficult to scale up to 10 MW and beyond due to their huge size and weight. Superconducting direct-drive wind generators are considered a promising solution to achieve lighter weight machines. This work presents an innovative 10 MW 8.1 rpm direct-drive partial superconducting generator using MgB2 wire for the field coils. It has a warm iron rotor configuration with the superconducting coils working at 20 K while the rotor core and the armature are at ambient temperature. A cooling system based on cryocoolers installed in the rotor extracts the heat from the superconducting coils by conduction. The generator's main parameters are compared against a permanent magnet reference machine, showing a significant weight and size reduction. The 10 MW superconducting generator concept will be experimentally validated with a small-scale magnetic machine, which has innovative components such as superconducting coils, modular cryostats and cooling systems, and will have similar size and characteristics as the 10 MW generator.