Abstract
In this paper, the distributed magnetic circuit method (DMCM) is used to calculate the magnetic circuit of a nonsalient pole synchronous generator and deal with the saturation effect of the iron-core material. The conformal transformation method is adopted for calculating the air-gap relative permeance to determine the slot effects of both the stator and the rotor and obtain the spatial and temporal distribution of air-gap flux density and radial vibration force wave. The results of the analytical calculation are very consistent with those of the finite-element method (FEM) and the time (8.47 s) spent on the calculation by the DMCM is much less than the time by the FEM (40 min 45 s). Through measuring the no-load back electromotive force waveform of the generator and the vibration acceleration spectrum of the generator feet, the DMCM is proved to be correct and effective, which will provide the theoretical basis for the accurate design of a magnetic circuit of the generator and for the quantitative analysis of its electromagnetic vibration.
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