[W-MA-111] Improvements in Accuracy of Anomalous Eddy Current Loss Calculations (2)

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Overview

The iron loss analysis method the most commonly applied uses measured iron loss data (hereinafter referred to as the conventional method). In the conventional method, since the application range is limited to the measurement conditions, there were problems in evaluating the influence of harmonics and DC superposition. On the other hand, new models such as play models and 1D methods, have come to be applied to iron loss analysis (hereinafter referred to as new methods). However, even with these new methods they still won’t be able to take in account the anomalous eddy current loss.
The previous report [[W-MA-88] Improvements in Accuracy of Anomalous Eddy Current Loss Calculations (1)] showed a method applicable to transient calculation as a modeling method of anomalous eddy current loss. The challenge of this method, has been a problem of physical interpretation of fitting by a function of anomalous eddy current loss correction coefficient, and a coefficient of less than 1 in a high frequency region. In this paper, as a result of examining and applying a new modeling method of anomalous eddy current loss, it is possible to obtain anomalous eddy current loss according to the excitation state. However, it was found that when applied to a high-frequency, high-DC bias field with large deviation from the excitation state at the time of derivation, it deviates from the actual measurement. It was confirmed that the iron loss due to the waveform including the harmonics can be calculated with high accuracy under the condition that the frequency is 1 kHz or less and the direct current superimposed amount is not large.

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