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Abstract

The performance of drives with switched reluctance motors (SRMs) depends on magnetic materials used in their construction which influence static parameters such as inductance and electromagnetic torque profiles. The paper deals with simulations of switched reluctance motors in the finite element method and their comparison with measurements. Two kinds of switched reluctance motors were analysed, the modified Emerson Electric motor with a laminated steel core and a prototype, the one with a magnetic core made of iron-based powder composite materials. In the first part of the research, magnetization curves of magnetic materials were measured for static and dynamic conditions with 50 Hz. Next, simulations and measurements of inductance and developed torque were compared and analysed. In the last part of the research, simulations of magnetic flux density in motors were conducted. As the result of the research, it occurred that the simulations and measurements are quite close and two kinds of motors exhibit similar performance.
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Bibliography

[1] Miller T.J.E., Brushless permanent-magnet and reluctance motor drives, Oxford University Press (1989).
[2] Krishnan R., Switched reluctance motor drives: modelling, simulation, analysis, design, and applications, CRC Press (2001).
[3] Ahn J.-W., Switched reluctance motor, in book Torque control Ed. Lamchich M.T., Intech (2011), DOI: 10.5772/10520.
[4] Lawrenson P.J., Stephenson J.M., Blenkinsop P.T., Corda J., Fulton N.N., Variable-speed switched reluctance motors, IEE Proceedings B. (Electric Power Applications), vol. 127, no. 4, pp. 253–265 (1980), DOI: 10.1049/ip-b.1980.0034.
[5] Widmer J.D., Martin R., Kimiabeigi M., Electric vehicle traction motors without rare earth magnets, Sustainable Materials and Technologies, vol. 3, pp. 7–13 (2015), DOI: 10.1016/j.susmat.2015.02.001.
[6] Riba J.-R., López-Torres C., Romeral L., Garcia A., Rare-earth-free propulsion motors for electric vehicles: A technology review, Renewable and Sustainable Energy Reviews, vol. 57, pp. 367–379 (2016), DOI: 10.1016/j.rser.2015.12.121.
[7] Nakamura H., The current and future status of rare earth permanent magnets, Scripta Materialia, vol. 154, pp. 273–276 (2018), DOI: 10.1016/j.scriptamat.2017.11.010.
[8] Coey J.M.D., Magnetism and Magnetic Materials, Cambridge University Press (2010).
[9] Shokrollahi H., Janghorban K., Soft magnetic composite materials (SMCs), Journal of Materials Processing Technology, vol. 189, no. 1–3, pp. 1–12 (2007), DOI: 10.1016/j.jmatprotec.2007.02.034.
[10] Périgo E.A.,Weidenfeller B., Kollár P., Füzer J., Past, present, and future of soft magnetic composites, Applied Physics Reviews, vol. 5, no. 3 (2018), DOI: 10.1063/1.5027045.
[11] Przybylski M., Modelling and analysis of the low-power 3-phase switched reluctance motor, Archives of Electrical Engineering, vol. 68, no. 2, pp. 443–454 (2019), DOI: 10.24425/aee.2019.128279.
[12] Przybylski M., Slusarek B., Di Barba P., Mognaschi M.E.,Wiak S., Temperature and torque measurements of switched reluctance actuator with composite or laminated magnetic cores, Sensors, vol. 20, no. 3065, pp. 1–14 (2020), DOI: 10.3390/s20113065.
[13] Meeker D., Finite element method magnetics – User’s manual, ver. 4.2 (2018).
[14] Miller T.J.E., Optimal design of switched reluctance motors, IEEE Transactions on Industrial Electronics, vol. 49, no. 1, pp. 15–27 (2002), DOI: 10.1109/41.982244.
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Authors and Affiliations

Marek Przybylski
1
ORCID: ORCID

  1. Łukasiewicz Research Network – Tele and Radio Research Institute, Poland
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Abstract

Switched reluctance motors (SRMs) are still under development to maximise their already proven usefulness.Amagnetic circuit of theSRMcan be made of soft magnetic composites (SMCs). The SMCs are composed of iron powder with dielectric and have a lot of advantages in comparison to commonly used electrical steel. The paper deals with the modelling and analysis of theSRMproduced by Emerson Electric Co. forwashing machines. Numerical calculations and modelling were done using the FEMM 4.2 program. Magnetic flux densities and magnetic flux lines were calculated, as well as electromagnetic torque and inductance for changing the position of a stator to a rotor. The obtained results were compared with other measurement results and are quite similar. The developed numerical model will be used for the project of a motor with an SMC magnetic circuit.

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Authors and Affiliations

Marek Przybylski
ORCID: ORCID
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Abstract

Coal mining tends to face increasing stress and gas conditions when it extends to deeper levels. The mining-induced high stress and gas pressure concentrations often result in gasogeodynamic phenomena such as rock bursts and coal & gas outbursts. Over the last decades, these gasogeodynamic events have been observed more often in the Upper Silesian Coal Basin, Poland. With the increasing mining depth, these hazards not only become a serious safety risk but also represent a significant challenge for coal mining. In order to eliminate future hazards and improve safety in underground coal mines, it is necessary to apply particular methods for the prevention and mitigation of possible hazards during mining operations. Inaction or incorrect use of preventive measures may lead to gasogeodynamic events, which may result in accidents and material losses, thereby affecting the mine’s economic performance. Several coal mines operated by Jastrzębska Spółka Węglowa S.A. (JSW group), such as Pniówek, Budryk and Zofiówka coal mines have been identified as the area most prone to rock bursts as well as coal and gas outburst. Generally, the longwall panels often experience a high degree of these mining hazards. Therefore, the main aim of this research is to examine and optimise the possibility of application of prevention methods in order to reduce the frequency and scale of dangerous gasogeodynamic phenomena such as coal and gas outburst. As a main part, the field testing of the selected preventive methods that were conducted in the JSW coal mines. Based on the obtained results, the possibility of application of an optimal method for the prevention and control of coal and gas outburst in the geo-mining conditions of the JSW coal mines was discussed. The research results could be an example for other coal mines in mine planning and designing in the gasogeodynamic (coal and gas outburst) hazard-prone conditions.
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Authors and Affiliations

Phu Minh Vuong Nguyen
1
ORCID: ORCID
Piotr Litwa
1
ORCID: ORCID
Marek Przybylski
2
ORCID: ORCID

  1. Central Mining Institute, Department of Extraction Technologies, Rockburst and Risk Assessment, 1 Gwarków Sq., 40-166 Katowice, Poland
  2. Jastrzębska Spółka Węglowa S.A., Pniówek Coal Mine, 18 Krucza st. 43-250, Pawłowice, Poland

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