Design of a Superconducting Synchronous Generator With LTS Field Windings for 12 MW Offshore Direct-Drive Wind Turbines. - Jin Wang; Ronghai Qu; Yuejin Tang; Yingzhen Liu; Bin Zhang; Jie He; Zhe Zhu; Haiyang Fang; Lushun Su (IEEE Trans. Ind. Electron., 2016)