Improved method to calculate the high-frequency eddy currents distribution and loss in windings composed of round conductors

摘要

With the switching frequency of power electronic devices increasing rapidly, the high-frequency loss in windings is becoming significant. The one-dimensional (1D) Dowell's method and 2D Ferreira's method are the most accepted methods used for winding loss calculation. Ferreira's method is used to calculate high-frequency loss in windings composed of round conductors. In this study, this method is modified and supplemented with a component called intra-layer proximity effect loss by considering the interaction between conductors in the same layer. The improved model gives much accurate prediction of 2D eddy current distribution in the cross-section of a round conductor with a wider band of frequency than Ferreira's method. On the basis of the eddy current distribution, the AC-to-DC winding resistance ratio is derived. The results of the improved method are verified by finite element method, and the error of loss calculation is <;0.6% when skin effect and proximity effect are very significant.