Measurement and modelling of rotational anomalous loss considering skin effect of electrical steel sheets
ISSN: 0332-1649
Article publication date: 6 November 2017
Abstract
Purpose
Due to existence of skin effect under rotational excitation, especially to high-frequency motors and power transformers run at the frequency of hundreds or even thousands of hertz, core losses will increase significantly, which may cause local overheating damage, and the efficiency and longevity will be decreased. The purpose of this paper is to accurately calculate the rotational anomalous loss in electrical steel sheets.
Design/methodology/approach
The influence of skin effect to rotational anomalous loss coefficient is described in detail. Based on the rotational core losses calculation approach, the transformed coefficient and parameters of rotational anomalous loss are determined in accordance with experimental data obtained by using 3D magnetic properties testing system. Then, a variable loss coefficient calculation model of rotational anomalous loss is built. Meanwhile, a separation of the total 2D elliptical rotation experimental core losses is worked out.
Findings
The two methods are analysed and compared qualitatively. It should be noted that the novel calculation model can be more effectively presented anomalous loss features. Moreover, quantitative comparisons between 2D elliptical rotation and alternating core losses have achieved beneficial conclusions.
Originality/value
Transformed rotational anomalous loss coefficient and parameters of electrical steel sheets considering skin effect are determined. Based on that, a novel calculation model evaluating 2D elliptical rotation anomalous loss is presented and verified based on the experimental measurement and the separation of the total 2D elliptical rotation core losses. The 2D elliptical rotation core losses separation method and quantitative comparison with alternating excitation are helpful to engineering application.
Keywords
Acknowledgements
This work was supported in part by the Key Project of State Key Laboratory of Tsinghua University, under Grant SKLD17Z01; the Key Project of National Natural Science Foundation of China, under Grant 51237005; the Natural Science Foundation of Hebei Province (Youth Foundation), China, under Grant E2014202137; and the National Natural Science Foundation of China, under Grant 51677103.
Citation
Li, J., Wang, L., Yang, Q., Wang, S., Li, Y., Zhang, C. and Qu, B. (2017), "Measurement and modelling of rotational anomalous loss considering skin effect of electrical steel sheets", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 36 No. 6, pp. 1750-1758. https://doi.org/10.1108/COMPEL-12-2016-0576
Publisher
:Emerald Publishing Limited
Copyright © 2017, Emerald Publishing Limited