Theoretical concept and FEM simulations of improved shielding for round horizontal yokes for rotational power loss measurement

Zurek, Stan

doi:10.1515/jee-2017-0038

Abstract

The paper introduces a theoretical concept of a shielding for horizontal yokes for measurements of rotational power loss and other rotational and two-dimensional properties. Apart from horizontal parts, the shielding relies on vertical pieces distributed uniformly around the sample circumference, symmetrically on both sides. The simulations in 2D and 3D FEM show significant improvement in reduction of H perpendicular to the sample surface (H_z). The gradient of the tangential H is reduced so that the extrapolation of values towards the surface might be no longer required. There is also an added benefit that the required magnetomotive force is significantly lower (20-70%) for achieving the same B in the sample, as compared to the previously used simple horizontal shields.

References

[1] J. Sievert et al , ”Intercomparison of measurements of magnetic losses electrical sheet steel under rotation flux conditions”, Com- mission of the European Communities, Report EUR 16255 EN, EC Brussels, Luxembourg, 1995.
Search in Google Scholar Back to article
[2] S. Zurek, ”Qualitative 3D FEM study of B and H distribu- tion circular isotropic samples for two-dimensional loss measure- ments”, Electrical Review (Przeglad Elektrotechniczny), R.91, NR 12/2015, 2015, pp. 43.10.15199/48.2015.12.09
Search in Google Scholar Back to article
[3] C. T. A. Johnk,Engineering electromagnetic fields & waves Willey International Edition New York, USA, 1975, ISBN 9780471442905.
Search in Google Scholar Back to article
[4] S. Zurek, ”Sensitivity to off-axis vector components of typical wire wound flat H-coil configurations”, IEEE Sensors Journal, vol. 17 (13), 2017, pp. 4021.10.1109/JSEN.2017.2704599
Search in Google Scholar Back to article
[5] S. Zurek, ”Clockwise-anticlockwise differences of rotational power loss for non-oriented electrical steels due to off-axis H-coil sensitivity”, under preparation.
Search in Google Scholar Back to article
[6] S. Somkun, ”Magnetostriction and magnetic anisotropy non- ori- ented electrical steels and stator core laminations”, PhD thesis, Wolfson Centre for Magnetics, Cardiff University, Cardiff, UK, 2010.
Search in Google Scholar Back to article
[7] T. Nakata et al , ”Improvement of measuring accuracy of mag- netic field strength single sheet testers by using two H coils”, IEEE Trans. Magnetics, vol. 23 (5), 1987, pp. 2596.10.1109/TMAG.1987.1065607
Search in Google Scholar Back to article
[8] O. Stupakov et al , ”Measurement of electrical steels with direct field determination”, IEEE Trans. Magnetics, vol. 46 (2), 2010, pp. 298.10.1109/TMAG.2009.2032861
Search in Google Scholar Back to article
[9] S. Zurek et al , ”Errors the power loss measured clockwise and anticlockwise rotational magnetisation. Part 1: Mathematical study”, IEE Proceedings, Science, Measurement and Technol- ogy, vol. 153 (4), 2006, pp. 147.10.1049/ip-smt:20050072
Search in Google Scholar Back to article
[10] S. Zurek et al , ”Errors the power loss measured clockwise and anticlockwise rotational magnetisation. Part 2: Physical phe- nomena”, IEE Proceedings, Science, Measurement and Technol- ogy, vol. 153 (4), 2006, pp .152.10.1049/ip-smt:20050073
Search in Google Scholar Back to article
[11] D. Makaveev et al , ”Measurement system for 2D magnetic prop- erties of electrical steel sheets: design and performance”, Pro- ceedings of 6th 1&2DM Workshop, Bad Gastein, Austria, 2000, pp. 48.
Search in Google Scholar Back to article
[12] J. G. Zhu et al , ”Two dimensional measurement of magnetic field and core loss using a square specimen tester”, IEEE Trans. Magnetics, vol. 29 (6), 1993, pp. 2995.10.1109/20.281098
Search in Google Scholar Back to article
[13] F. Fiorillo et al , ”The measurement of rotational losses at IEN”, Use of the thermometric method, Proceedings of 1st 1&2DMWorkshop, Braunschweig, Germany, 1991, pp. 162.
Search in Google Scholar Back to article
[14] J. Wanjiku et al , ”Shielding of the z-component of magnetic field a 2-D magnetizer with a deep yoke”, presented at IEEE International Electric Machines & Drives Conference (IEMDC), 2015.10.1109/IEMDC.2015.7409231
Search in Google Scholar Back to article
[15] M. Jesenik et al , ”Enlargement of the rotational field homo- geneity area a two-phase round rotational single sheet tester”, Informacije MIDEM, vol. 32 (2), 2002, pp. 100.
Search in Google Scholar Back to article
[16] D. Meeker, ”Finite Element Method Magnetics”, http://www.femm.info.
Search in Google Scholar Back to article
[16] ANSYS, http://www.ansys.com.
Search in Google Scholar Back to article

Theoretical concept and FEM simulations of improved shielding for round horizontal yokes for rotational power loss measurement

Abstract

Paradigm

My account