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Axial Flux PM Machines With Concentrated Armature Windings: Design Analysis and Test Validation of Wind Energy Generators

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4 Author(s)
Di Gerlando, A. ; Dept. of Electr. Eng., Politec. di Milano, Milan, Italy ; Foglia, G. ; Iacchetti, M.F. ; Perini, R.

Some design and operation aspects of axial flux permanent magnet synchronous machines, wound with concentrated coils, are presented. Due to their high number of poles, compactness, and excellent waveform quality and efficiency, these machines show satisfactory operation at low speeds, both as direct drive generators and as motors. In this paper, after a general analysis of the model and design features of this kind of machine, the attention is focused on wind power generation: The main sizing equations are defined, and the most relevant figures of merit are examined by means of a suitable parametric analysis. Some experimental results obtained by testing a three-phase, 50-kW, and 70-rpm prototype are presented and discussed, validating the modeling theory and the design procedure.

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Industrial Electronics, IEEE Transactions on  (Volume:58 ,  Issue: 9 )