Abstract
In reluctance and permanent magnet synchronous machines, flux barriers are crucial for magnetic flux guidance. Designed as cutouts, flux barriers reduce the mechanical strength of the rotor construction. To operate these electric drives at higher rotational speed, an alternative flux barrier design is required. Since residual stress influences the magnetic properties of soft magnetic materials, this paper deals with embossing induced residual stress as flux barriers in non-oriented electrical steel with 2.4 wt% silicon and a sheet thickness of 0.35 mm. The investigated flux barriers were fabricated with a cylindrical or spherical punch at two different penetration depths and were compared to a flux barrier fabricated as cutout. A residual stress analysis using finite element analysis helps understanding the mechanism of embossed flux barriers. Additionally, the influence of induced residual stress on the magnetic material behavior is measured using standardized single sheet tests and neutron grating interferometry measurements. This investigation aimed at a better understanding of the flux barrier design by local induction of residual stress.
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References
Naumoski H, Maucher A, Herr U (2015) Investigation of the influence of global stresses and strains on the magnetic properties of electrical steels with varying alloying content and grain size. https://doi.org/10.1109/EDPC.2015.7323206
Cao H, Huang S, Shi W (2019) Influence of core stress on performance of permanent magnet synchronous motor. J Magn 24(1):24–31. https://doi.org/10.4283/JMAG.2019.24.1.024
Weiss HA, Trober P, Golle R, Steentjes S, Leuning N, Elfgen S, Hameyer K, Volk W (2018) Impact of punching parameter variations on magnetic properties of nongrain-oriented electrical steel. IEEE Trans Ind Appl 54(6):5869–5878. https://doi.org/10.1109/TIA.2018.2853133
Kai Y, Tsuchida Y, Todaka T, Enokizono M (2014) Influence of biaxial stress on vector magnetic properties and 2-D magnetostriction of a nonoriented electrical steel sheet under alternating magnetic flux conditions. IEEE Trans Magn 50(4). https://doi.org/10.1109/TMAG.2013.2287875
Vogt S, Neuwirth T, Schauerte B, Weiss HA, Falger PM, Gustschin A, Schulz M, Hameyer K, Volk W (2019) Extent of embossing-related residual stress on the magnetic properties evaluated using neutron grating interferometry and single sheet test. Prod Eng Res Devel 13(2):211–217. https://doi.org/10.1007/s11740-018-0863-7
Grünzweig C, David C, Bunk O, Dierolf M, Frei G, Kühne G, Kohlbrecher J, Schäfer R, Lejcek P, Rønnow HMR, Pfeiffer F (2008) Neutron decoherence imaging for visualizing bulk magnetic domain structures. Phys Rev Lett 101(2). https://doi.org/10.1103/PhysRevLett.101.025504
British Standards Institution (1992) Magnetic materials. Methods of measurement of the magnetic properties of magnetic sheet and strip by means of a single sheet tester (6404–3). Brit Stan Inst https://doi.org/10.3403/00279002. Zugegriffen: 10. January 2020
Kurosaki Y, Mogi H, Fujii H, Kubota T, Shiozaki M (2008) Importance of punching and workability in non-oriented electrical steel sheets. J Magn Magn Mater 320(20):2474–2480. https://doi.org/10.1016/j.jmmm.2008.04.073
Weiss HA, Leuning N, Steentjes S, Hameyer K, Andorfer T, Jenner S, Volk W (2017) Influence of shear cutting parameters on the electromagnetic properties of non-oriented electrical steel sheets. J Magn Magn Mater 421:250–259. https://doi.org/10.1016/j.jmmm.2016.08.002
Strobl M, Grünzweig C, Hilger A, Manke I, Kardjilov N, David C, Pfeiffer F (2008) Neutron dark-field tomography. Phys Rev Lett 101(12). https://doi.org/10.1103/PhysRevLett.101.123902
Neuwirth T, Backs A, Gustschin A, Vogt S, Pfeiffer F, Böni P, Schulz M (2020) A high visibility Talbot-Lau neutron grating interferometer to investigate stress-induced magnetic degradation in electrical steel. Sci Rep
Reimann T, Mühlbauer S, Horisberger M, Betz B, Böni P, Schulz M (2016) The new neutron grating interferometer at the ANTARES beamline: Design, principles and applications. J Appl Crystallogr 49(5):1488–1500. https://doi.org/10.1107/S1600576716011080
Calzada E, Gruenauer F, Mühlbauer M, Schillinger B, Schulz M (2009) New design for the ANTARES-II facility for neutron imaging at FRM II. Nucl Instrum Methods Phys Res, Sect A 605(1–2):50–53. https://doi.org/10.1016/j.nima.2009.01.192
Schulz M, Schillinger B (2015) ANTARES: Cold neutron radiography and tomography facility. JLSRF 1. https://doi.org/10.17815/jlsrf-1-42
Weiss HA, Steentjes S, Tröber P, Leuning N, Neuwirth T, Schulz M, Hameyer K, Golle R, Volk W (2019) Neutron grating interferometry investigation of punching-related local magnetic property deteriorations in electrical steels. J Magn Magn Mater 474:643–653. https://doi.org/10.1016/j.jmmm.2018.10.098
Fiorillo F (2004) Measurement and characterization of magnetic materials, 1. Aufl. Elsevier series in electromagnetism. Elsevier Academic Press, San Diego, Calif
Leuning N, Steentjes S, Weiss HA, Volk W, Hameyer K (2018) Magnetic material deterioration of non-oriented electrical steels as a result of plastic deformation considering residual stress distribution. IEEE Trans Magn 54(11). https://doi.org/10.1109/TMAG.2018.2848365
Acknowledgments
This work was supported by the Deutsche Forschungsgemeinschaft (DFG) in the DFG priority program “SPP2013—Focused Local Stress Imprint in Electrical Steel as Means of Improving the Energy Efficiency” - HA 4395/22-1; SCHU 3227/2-1; VO 1487/31-1. The results of this work are based upon experiments performed at the ANTARES instrument at Heinz Maier-Leibnitz Zentrum (MLZ), Garching, Germany.
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Gilch, I. et al. (2021). Analysis of Cylindrically and Spherically Embossed Flux Barriers in Non-oriented Electrical Steel. In: Daehn, G., Cao, J., Kinsey, B., Tekkaya, E., Vivek, A., Yoshida, Y. (eds) Forming the Future. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-75381-8_193
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