A New External Search Coil Based Method to Detect Detailed Static Air-Gap Eccentricity Position in Nonsalient Pole Synchronous Generators. - Yu-Ling He; Zhi-Jie Zhang; Wen-Qiang Tao; Xiaolong Wang 011; David Gerada; Chris Gerada; Peng Gao (IEEE Trans. Ind. Electron., 2021)