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Two-dimensional Cartesian air-gap element (CAGE) for dynamic finite-element modeling of electrical machines with a flat air gap

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6 Author(s)
Wang, R. ; Dept. of Electr. Eng., Univ. of Stellenbosch, Matieland, South Africa ; Mohellebi, H. ; Flack, T.J. ; Kamper, M.J.
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This paper extends the air-gap element (AGE) to enable the modeling of flat air gaps. AGE is a macroelement originally proposed by Abdel-Razek et al. (IEEE Trans. Magn., vol. 17, pp. 3250-3252, 1981; ibid., vol. 18, pp. 655-659, 1982) for modeling annular air gaps in electrical machines. The paper presents the theory of the new macroelement and explains its implementation within a time-stepped finite-element (FE) code. It validates the solution produced by the new macroelement by comparing it with that obtained by using an FE mesh with a discretized air gap. It then applies the model to determine the open-circuit electromotive force of an axial-flux permanent-magnet machine and compares the results with measurements

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Magnetics, IEEE Transactions on  (Volume:38 ,  Issue: 2 )