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Investigation of the eddy-current anomaly in electrical sheet steels

 

作者: F.Brailsford,  

 

期刊: Journal of the Institution of Electrical Engineers - Part II: Power Engineering  (IET Available online 1948)
卷期: Volume 95, issue 43  

页码: 38-48

 

年代: 1948

 

DOI:10.1049/ji-2.1948.0007

 

出版商: IEE

 

数据来源: IET

 

摘要:

The well-known discrepancy between the calculated value of the eddy-current losses in electrical sheet steels at supply frequencies and the experimentally observed value is discussed. The effect of the flux waveform distortion due to magnetic non-uniformity of laminations is examined experimentally and found to be small. It is shown, however, from experiments on a model, that inside each lamination the flux waveform distortion with alternating magnetization is severe, and is sufficient to cause the hysteresis loss per cycle to be strongly frequency-dependent. On the other hand, the discrepancy which occurs with alternating magnetization is found to be absent with a pure rotational flux where there are no waveform effects. It is concluded that, without having recourse to more elaborate explanations, the observed anomaly might be largely accounted for by the increased hysteresis loss brought about by internal flux waveform distortion, the true eddy-current loss being, in fact, not appreciably different from its calculated value.

 

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