Abstract
We describe a method for analyzing the harmonics components of the air-gap magnetic flux density distribution of doubly-fed generators that takes into consideration the influence of the circumference slot arrangement and winding pattern. The proposed method is based on an analytical equation of the permeance and the magnetomotive force (mmf) distributions. This method is applied to analyze quantitatively the harmonic components of the air-gap magnetic flux density distributions of a doubly-fed generator under different driving conditions. The analytical results obtained using the proposed method are in agreement with those of finite element magnetic field analysis (FEA). Thus, this method is shown to be an appropriate and useful method for quantitatively estimating magnetic flux density for doubly-fed generator.
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