The electromagnetic and mechanical design aspects of optimally designed double rotor radial flux permanent-magnet wind generators with nonoverlap air-cored (ironless) stator windings are analyzed in this paper. An accurate analytical design optimization method is proposed. The analytical model is confirmed by finite-element analysis. It is shown, among other things, that the electromagnetic design, and not the mechanical design, determines the rotor yoke dimensions and, thus largely, the mass and cost of the generator.
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Stegmann et al. (2011) studied this question.