A Review on the Empirical Core Loss Models for Symmetric Flux Waveforms

This article presents a review of the empirical core loss models for symmetric flux waveforms. These empirical models are based on Steinmetz and Bertotti loss models. The principles, advantages, and limitations of the existing models are explained and discussed. The models are evaluated based on four main criteria: 1) physics background, 2) complexity, 3) accuracy, and 4) flexibility and generality to include multiple effects. This article also discusses some scientific issues in existing works regarding the characterization of relaxation loss.