Effect of punching and water-jet cutting methods on magnetization curve and energy losses of non-oriented magnetic steel sheets

Abstract

Strip samples of widths ranging between 5 mm and 30 mm were cut from different types of non-oriented magnetic steel sheets by means of guillotine shear cutting and water-jet technology and characterized from DC to 400 Hz. The measured magnetization curves and energy losses and their dependence on the strip width, that is, on the proportion of damaged to pristine sample cross-section, have been analyzed and modeled. While confirming an expected lighter material deterioration engendered by water-jet cutting, the analysis of the results remarkably shows that the evolution of the normal magnetization curve and the quasi-static magnetic losses with the width of the cut strip follows a hyperbolic law. This novel finding permits one to predict, using minimum pre-emptive information, the evolution of normal magnetization curve and hysteresis loss from indefinitely wide to narrow fully degraded strip. The highly strain-hardened region is, in this way, estimated to propagate from the strip edge by about 2.1 mm and 1.6 mm in the punched and water-jet cut samples, respectively. The dynamic loss behavior is assessed by analysis of the excess loss component, in accordance with the statistical theory of losses. A small to moderate increase of the dynamic loss (i.e. of the excess loss) with decreasing strip width is found, following to some extent the behavior of the quasi-static loss.

Keywords

Magnetic losses non-oriented steel sheets strain-hardening

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References

Ossart

Hug

Hubert

Buvat

and Billardon

, Effect of punching on electrical steels: experimental and numerical coupled analysis, IEEE Trans. Magn.36 (2000), 3137–3140, doi: 10.1109/20.908712.

Nakata

Nakano

and Kawahara

, Effects of stress due to cutting on magnetic characteristics of silicon steels, IEEE Transl. J. Magn. Japan7 (1992), 1453–457, doi: 10.1109/TJMJ.1992.4565422.

Baudouin

De Wulf

Kestens

and Houbaert

, The effect of guillotine clearance on the magnetic properties of electrical steels, J. Magn. Magn. Mater.256 (2003), 32–40, doi: 10.1016/S0304-8853(02)00004-5.

Maurel

Ossart

and Billardon

, Residual stress in punched laminations: phenomenological analysis and influence on the magnetic behavior of electrical steels, J. Appl. Phys.93 (2003), 7106–7108, doi: 10.1063/1.1557279.

Gmyrek

Cavagnino

and Ferraris

, Estimation of the magnetic properties of the damaged area resulting from the punching process: experimental research and FEM modeling, IEEE Trans. Ind. Appl.49 (2013), 2069–2077, doi: 10.1109/TIA.2013.2261041.

Hofman

Naumoski

Herr

and Herzog

, Magnetic properties of electrical steel sheets in respect of cutting: micromagnetic analysis and macromagnetic modeling, IEEE Trans. Magn.52 (2016), 2000114, doi: 10.1109/TMAG.2015.2484280.

Petrun

Steentjes

Hameyer

and Dolinar

, Modeling the influence of varying magnetic properties in soft magnetic materials on the hysteresis shape using the flux tube approach, J. Appl. Phys.117 (2015), 17A708, doi: 10.1063/1.4906956.

Steentjes

von Pfingsten

and Hameyer

, An application-oriented approach for consideration of material degradation effects due to cutting on iron losses and magnetizability, IEEE Trans. Magn.50 (2014), 027804, doi: 10.1109/TMAG.2014.2334699.

Kedous-Lebouc

Messal

and Youmssi

, Joint punching and frequency effects on practical magnetic characteristics of electrical steels for high-speed machines, J. Magn. Magn. Mater.426 (2017), 658–665, doi: 10.1016/j.jmmm.2016.10.150.

10.

Bertotti

, Hysteresis in Magnetism, San Diego, CA: Academic Press, 1998, pp. 391–430.

11.

Barbisio

Fiorillo

and Ragusa

, Predicting loss in magnetic steels under arbitrary induction waveform and with minor hysteresis loops, IEEE Trans. Magn.40 (2004), 1810–1819, doi: 10.1109/TMAG.2004.830510.

12.

Appino

Hamrit

Fiorillo

Ragusa

de la Barrière

Mazaleyrat

and LoBue

, Skin effect in steel sheets under rotating induction, Int. J. Appl. Electromagn. Mech.48 (2015), 247–254, doi: 10.3233/JAE-151995.

13.

de la Barrière

Appino

Fiorillo

Ragusa

Lecrivain

Rocchino

Ben Ahmed

Gabsi

Mazaleyrat

and LoBue

, Characterization and prediction of magnetic losses in soft magnetic composites under distorted induction waveform, IEEE Trans. Magn.49 (2013), 1318–1326, doi: 10.1109/TMAG.2012.2218614.

14.

Ragusa

Zhao

Appino

Khan

de la Barrière

and Fiorillo

, Loss decomposition in non-oriented steel sheets: the role of the classical losses, IEEE Magn. Lett.7 (2016), 5106105, doi: 10.1109/LMAG.2016.2604204.