Vol. 337 No. 10 (2026)
DOI https://doi.org/10.18799/24131830/2026/10/5265
Modeling and performance analysis of a synchronous reluctance motor with ferrite magnets and a starting short-circuited winding with different numbers of slots per pole and phase
Relevance. There is a growing need to improve the energy efficiency of electric motors without the use of rare-earth magnets in typical non-variable speed electric drive applications such as pumps, fans and compressors. Direct-on-line ferrite assisted synchronous reluctance motors can have a high energy efficiency class. In addition, their production does not use expensive and scarce rare earth permanent magnets. Such machines can be a promising replacement for relatively inefficient IE3 class asynchronous motors and synchronous motors with expensive rare-earth magnets. At the same time, the development of direct-on-line ferrite assisted synchronous reluctance motors has its own features and problems associated with the low coercivity of ferrite magnets and the limited starting capability of synchronous motors when directly powered from the network. Aim. To develop a direct-on-line ferrite assisted synchronous reluctance motor (rated power 0.75 kW, rated speed 1500 rpm) of IE5 energy efficiency class and to study its steady-state characteristics under load and start-up characteristics. Comparison of characteristics of different engine design options. Methods. Mathematical modeling, two-dimensional finite element method. Results and conclusions. The authors have developed a new design of the direct-on-line ferrite assisted synchronous reluctance motors, the calculated characteristics of which correspond to the energy efficiency class of IE5. Based on the finite element method, the authors obtained the results of modeling of two variants of the new design of the direct-on-line ferrite assisted synchronous reluctance motors with a different number of slots per pole and phase. The authors studied the starting characteristics of the direct-on-line ferrite assisted synchronous reluctance motors. It was shown that the motor starts reliably at rated load torque and a tripled moment of rotor inertia. It was confirmed that the considered electric machine with the obtained performances can be an alternative to asynchronous motors and synchronous motors with rare earth magnets in the target application.
For citation: Valeev E.A., Kazakbaev V.M., Dmitrievskii V.A., Prakht V.A., Dranitsyn D.S. Modeling and performance analysis of a synchronous reluctance motor with ferrite magnets and a starting short-circuited winding with different numbers of slots per pole and phase. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 10, pp. 214–225. http://doi.org/10.18799/24131830/2026/10/5265
Keywords:
Ferrite-assisted, IE class, electrical machines, direct-on-line, synchronous reluctance motor, finite element method
References:
1. Zhou X., Yang B., Ma Y., Gao Z. Research review on the energy-saving technologies for asynchronous motors. 2018 IEEE International Conference on Mechatronics and Automation (ICMA). Changchun, China, August 05–08, 2018. pp. 195–199. DOI: 10.1109/ICMA.2018.8484643.
2. Petrov I., Liu Y., Abramenko V., Lindh P., Pyrhönen J. Direct-on-line-start permanent-magnet-assisted synchronous reluctance machine with ferrite magnets. 43rd Annual Conference of the IEEE Industrial Electronics Society. Beijing, China, October 29 – November 01, 2017. pp. 1911–1918. DOI: 10.1109/IECON.2017.8216323.
3. De Almeida A.T., Ferreira F.J.T.E., Baoming G. Beyond induction motors – technology trends to move up efficiency. IEEE Transactions on Industry Applications, 2014, vol. 50, no. 3, pp. 2103–2114. DOI: 10.1109/TIA.2013.2288425.
4. Sorgdrager A.J., Wang R.-J., Grobler A.J. Multiobjective design of a line-start PM motor using the taguchi method. IEEE Transactions on Industry Applications, 2018, vol. 54, no. 5, pp. 4167–4176. DOI: 10.1109/TIA.2018.2834306.
5. WQuattro, super premium efficiency motor. WEG group, catalogue, Code 50025713, Revision 03. Brazil, 2017. pp. 4. Available at: https://mechatronika.tech/wp-content/uploads/2020/11/Karta-katalogowa-silnik%C3%B3w-Quattro-W22-WEG.pdf (accessed 11 June 2025).
6. SynchroVert IE4 Super Premium Efficiency Motors, Bharat Bijlee, catalogue. India, Mumbai, 2016. pp. 12. Available at: https://www.bharatbijlee.com/media/14228/synchrovert_catalogue.pdf (accessed 11 June 2025).
7. Ismagilov F.R., Vavilov V.E., Gusakov D.V. Line-start permanent magnet synchronous motor for aerospace application. IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC). Nottingham, UK, November 07–09, 2018. pp. 1–5. DOI: 10.1109/ESARS-ITEC.2018.8607689.
8. Paramonov A.S., Oshurbekov S.K., Kazakbaev V.M., Prakht V.A., Dmitrievskii V.A. Investigation of the influence of low voltage and the effect of the cable on the success of the launch of the line-start permanent magnet motor as part of a centrifugal pumping unit. South-Siberian Scientific Bulletin, 2023, vol. 2, no. 48, pp. 98–112. (In Russ.) DOI: 10.25699/SSSB.2023.48.2.002.
9. Filho W.L., De Lima I.B. Rare earth industry. Technological, economic, and environmental implications. The Netherlands, Amsterdam, Elsevier, 2015. pp. 434. DOI: 10.1109/ACCESS.2022.3213063.
10. Kononenko E. Synchronous reluctance machines. Moscow, Energiya Publ., 1970. 208 p. (In Russ.)
11. Dmitrievskii V., Prakht V., Kazakbaev V. IE5 energy-efficiency class synchronous reluctance motor with fractional slot winding. IEEE Transactions on Industry Applications, 2019, vol. 55, no. 5, pp. 4676–4684. DOI: 10.1109/TIA.2019.2924405.
12. Muteba M. Line-start synchronous reluctance motor with V-shaped rotor laminations. IEEE Access, 2022, vol. 10, pp. 109277–109288. DOI: 10.1109/ACCESS.2022.3213063.
13. Kim H., Kang J., Kim J., Ahn J., Yun I., Lee J. Design and analysis of line-start synchronous reluctance motor considering the maximum inertia and power factor. IEEE Transactions on Industry Applications, 2023, vol. 59, no. 5, pp. 5908–5918. DOI: 10.1109/TIA.2023.3277824.
14. Kim H., Park Y., Oh S.-T., Jang H., Won S.-H., Chun Y.-D., Lee J. A study on the rotor design of line start synchronous reluctance motor for IE4 efficiency and improving power factor. Energies, 2020, vol. 13, no. 21, pp. 5774. DOI: 10.3390/en13215774.
15. Mousavi-Aghdam S.R., Azimi A. Design and analysis of a new improved rotor structure in line-start synchronous reluctance motors. Electrical Engineering, 2024, vol. 106, pp. 2313–2324. DOI: 10.1007/s00202-023-02058-0.
16. Kazakbaev V., Oshurbekov S., Prakht V., Dmitrievskii V. Feasibility study of direct-on-line energy-efficient motors in a pumping unit, considering reactive power compensation. Mathematics, 2021, vol. 9, no. 18, pp. 2196. DOI: 10.3390/math9182196.
17. Reluktanzmotoren, EMOD Motoren GmbH, catalogue number: 834. (DOL SynRM catalogue). Germany, 2009. pp. 12. Available at: http://www.com-sol.ru/katalog/elektrodvigateli/emod/kat/reakt.pdf (accessed 11 June 2025).
18. Self-starting synchronous motor, a new dimension of efficiency smaller overall dimensions and same power. Motovario, a TECO Froup company. Catalogue. Italy, 2021. pp. 5. Available at: https://fcrmotion.com.au/wp-content/uploads/2021/11/MOTOVARIO-cat-Self-Power_EN_web.pdf (accessed 11 June 2025).
19. Hu Y., Xiao Y., Shi J., Chen B., Li Y., Li L. Design and verification of IE6 ultra efficiency line-start permanent magnet assisted synchronous reluctance motor. 2024 27th International Conference on Electrical Machines and Systems (ICEMS). Fukuoka, Japan, November 26–29, 2024. pp. 513–518. DOI: 10.23919/ICEMS60997.2024.10921042.
20. Kim H., Park Y., Liu H.-C., Han P.-W., Lee J. Study on line-start permanent magnet assistance synchronous reluctance motor for improving efficiency and power factor. Energies, 2020, vol. 13, no. 2, pp. 384. DOI: 10.3390/en13020384.
21. Baka S., Sashidhar S., Fernandes B.G. Design of an energy efficient line-start two-pole ferrite assisted synchronous reluctance motor for water pumps. IEEE Transactions on Energy Conversion, 2021, vol. 36, no. 2, pp. 961–970. DOI: 10.1109/TEC.2020.3029110.
22. Baka S., Sashidhar S., Fernandes B.G. Influence of zero-sequence circulating current on the performance of star-delta winding line-start ferrite assisted synchronous reluctance motor. IEEE Transactions on Energy Conversion, 2022, vol. 37, no. 3, pp. 1557–1566. DOI: 10.1109/TEC.2022.3154476.
23. Vishal M.J., Kushwaha A., Fernandes B.G. Design improvement of a line-start ferrite-assisted synchronous reluctance motor. 11th National Power Electronics Conference (NPEC). Guwahati, India, December 14–16, 2023. pp. 1–6. DOI: 10.1109/NPEC57805.2023.10384938.
24. Meier F. Permanent-magnet synchronous machines with non-overlapping concentrated windings for low-speed direct-drive applications. PhD Diss. Sweden, 2008. 165 p.
25. Dmitrievskii V., Prakht V., Kazakbaev V. Developing and experimental study a 1.5 kW synchronous reluctance motor of ultra premium efficiency (IE5 class). IEEE 58th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON). Riga, Latvia, 12–13 October 2017. pp. 1–5. DOI: 10.1109/RTUCON.2017.8124836.
26. IEC 60034-30-1:2014. Rotating electrical machines. P. 30-1: Efficiency classes of line operated AC motors (IE code). Geneva, Switzerland, 2014. 50 p.
