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Kern, Alexander (author), Mulder, Christoph (author), Hameye, Kay (author), Dong, J. (author)Magnetic force excitations in the air gap of generators can lead to tonal noise emissions of direct-drive wind turbines. Besides the magnetic circuit design, the generator air gap topology has an impact on the excited vibration modes and their frequencies, respectively. For the model-based analysis of the excited force density waves, the spatial...conference paper 2021