Vol. 63

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Improving the Efficiency of Electrical High-rpm Generators with Permanent Magnets and Tooth Winding

By Flur R. Ismagilov, Viacheslav Vavilov, and Ruslan D. Karimov
Progress In Electromagnetics Research M, Vol. 63, 93-105, 2018


This paper solves the problem of minimizing losses in the stator magnetic core of high-speed electric machines with the use of amorphous iron. A fundamentally new technology for manufacturing of a stator magnetic core from segments of amorphous steel is developed by the authors. The feature of the new stator design is the possibility to use technological ducts located inside the stator as cooling ducts. This aspect significantly improves the heat dissipation from the active zone of the stator and, accordingly, minimizing temperature. The efficiency of this solution was studied using two power generators of 100 kW and 200 kW and rotational speeds of 60,000 rpm and 45,000 rpm respectively in the software complex Ansys Maxwell. Harmonic compositions of currents and voltages, flux density distributions in active elements of the generator in various operating modes were studied: under load, in a three-phase short-circuit and at idle. Also, the obtained data were compared with analogous models of an electrogenerator made of electrical steel. The results of the study showed the operability and effectiveness of the proposed technology. Based on the results of the research, a prototype of the stator magnetic core made from amorphous iron was created. Losses in the generator were experimentally measured. Also the results of experimental studies of aerodynamic losses are presented.


Flur R. Ismagilov, Viacheslav Vavilov, and Ruslan D. Karimov, "Improving the Efficiency of Electrical High-rpm Generators with Permanent Magnets and Tooth Winding," Progress In Electromagnetics Research M, Vol. 63, 93-105, 2018.


    1. Uzhegov, N., J. Pyrhonen, and S. Shirinskii, "Loss minimization in high-speed permanent magnet synchronous machines with tooth-coil windings," IECON 2013 --- 39th Annual Conference of the IEEE Industrial Electronics Society, 2960-2965, 2013.

    2. Ganev, E., "High-performance electric drives for aerospace more electric architectures," IEEE Power Engineering Society Meeting, 1-8, 2007.

    3. Ganev, E., "Selecting the best electric machines for electrical power generation systems," IEEE Electrification Magazine, Dec. 2014.

    4. Besnard, J.-P., F. Biais, and M. Martinez, "Electrical rotating machines and power electronics for new aircraft equipment systems," ICAS-Secretariat --- 25th Congress of the International Council of the Aeronautical Sciences, 2006.

    5. Nagorny, A., N. Dravid, R. Jansen, and B. Kenny, "Design aspects of a high speed permanent magnet synchronous motor/generator for flywheel applications,", NASA/TM-2005-213651, 1–7, 2005.

    6. Bobtsov, A. A., et al., "A robust globally convergent position observer for the permanent magnet synchronous motor," Automatica, Vol. 61, 47-54, 2015.

    7. Zhu, Z. Q., "David howe electrical machines and drives for electric, hybrid, and fuel cell vehicles," Proceedings of the IEEE, Vol. 95, No. 4, 746-765, 2007, DOI: 10.1109/JPROC.2006.892482.

    8. Chin, Y. K., "A permanent magnet synchronous motor for traction application of electric vehicle," IEEE Int. Electric Machines and Drive Conference, Vol. 2, 1035-1041, 2003.

    9. Gieras, J. F., "High speed machines," Advancements in Electric Machines (Power Systems), 81-113, 2008.

    10. Bailey, C., D. Saban, and P. Guedes-Pinto, "Design of high-speed direct-connected permanentmagnet motors and generators for the petrochemical industry," IEEE Transactions on Industry Applications, Vol. 45, No. 3, 1159-1165, 2009.

    11. Carlson, R. and F. Wurtz, "Optimal design of a set of permanent magnet generators with the same cross-section," J. Microw. Optoelectron. Electromagn. Appl., Vol. 12, No. 2, 678-693, Sao Caetano do Sul, Dec. 2013.

    12. Abdi, B., J. Milimonfared, and J. Moghani, "Simplified design and optimization of slotless synchronous PM machine for micro-satellite electro-mechanical batteries," Advances in Electrical and Computer Engineering, Vol. 9, No. 3, 84-88, 2009.

    13. Borisavljevic, A., H. Polinder, and J. Ferreira, "On the speed limits of permanent-magnet machines," IEEE Transactions on Industrial Electronics, Vol. 57, No. 1, 220-227, 2010.

    14. Munteanu, G., A. Binder, and T. Schneider, "Loss measurement of a 40 kW high-speed bearingless PM synchronous motor," IEEE Energy Conversion Congress and Exposition: Energy Conversion Innovation for a Clean Energy Future, ECCE 2011, Proceedings 2011, Article number 6063841, 722-729, 2011.

    15. Johnson, D., P. Pillay, and M. Malengret, "High speed PM motor with hybrid magnetic bearing for kinetic energy storage," Conference Record --- IAS Annual Meeting (IEEE Industry Applications Society), Vol. 1, 57-63, 2001.

    16. Ismagilov, F., I. Khairullin, V. Vavilov, and M. Gumerova, "Application of hybrid magnetic bearings in aviation starter-generators," International Review of Electrical Engineering, Vol. 9, No. 3, 506-510, 2014.

    17. Tuysuz, A., M. Steichen, C. Zwyssig, and J. W. Kolar, "Advanced cooling concepts for ultrahigh- speed machines," 9th International Conference on Power Electronics — ECCE Asia: “Green World with Power Electronics”, ICPE 2015-ECCE Asia, 2194-2202, 2015.

    18. Dajaku, G. and D. Gerling, "Magnetic radial force density of the PM machine with 12-teeth/10- poles winding topology," IEEE International Electric Machines and Drives Conference, IEMDC 2009, 157-164, Florida, USA, May 3–6, 2009.

    19. Isomura, K., M. Murayama, S. Teramoto, K. Hikichi, and Y. Endo, "Experimental verification of the feasibility of a 100W class micro-scale gas turbine at an impeller diameter of 10mm," J. Micromech. Microeng., Vol. 16, 254-261, 2006.

    20. Vavilov, V., F. R. Ismagilov, I. Hairullin, and D. Gusakov, "High efficiency ultra-high speed microgenerator," Conf. Rec. IEEE IECON, 2016.

    21. Gerling, D. and M. Alnajjar, "Six-phase electrically excited synchronous generator for more electric aircraft," International Symposium on Power Electronics, Electrical Drives, Automation and Motion,, 7-13, 2016.

    22. Huynh, C., L. Zheng, and D. Acharya, "Losses in high speed permanent magnet machines used in microturbine applications," Journal of Engineering for Gas Turbines and Power, Vol. 131, No. 2, 1-6, 2009.

    23. Wang, Z., et al., "Development of a permanent magnet motor utilizing amorphous wound cores," IEEE Transactions on Magnetics, Vol. 46, No. 2, 570-573, Feb. 2010.

    24. Wang, Z., et al., "Development of an axial gap motor with amorphous metal cores," IEEE Trans. Ind. Appl., Vol. 47, No. 3, 1293-1299, May/Jun. 2011.

    25. Pabut, O., M. Kirs, H. Lend, and T.Tiirats, "Optimal structural design of a slotless permanent magnet generator," Proceedings of the International Conference of DAAAM Baltic “Industrial Engineering”, Vol. 2015, 75-81, Jan. 2015.

    26. Koo, M., J.-Y. Choi, J.-H. Jeong, H.-J. Shin, and K. Hong, "Characteristic analysis of permanentmagnet synchronous generator with slotless stator structure considering magnetic/mechanical air gap using semi-3-D analytical method," IEEE Transactions on Magnetics, Vol. 51, No. 11, 87-92, Nov. 1, 2015.

    27. Yakupov, A., F. Ismagilov, I. Khayrullin, and V. Vavilov, "Method of designing high-speed generators for the biogas plant," International Journal of Renewable Energy Research, Vol. 6, No. 2, 447-454, 2016.

    28. Uzhegov, N., E. Kurvinen, J. Nerg, J. T. Sopanen, and S. Shirinskii, "Multidisciplinary design process of a 6-slot 2-pole high-speed permanent-magnet synchronous machine," IEEE Transactions on Industrial Electronics, Vol. 63, No. 2, 784-795, Feb. 2016.

    29. Zwyssig, C., J. W. Kolar, and S. D. Round, "Mega-speed drive systems: Pushing beyond 1 million RPM," IEEE/ASME Transactions on Mechatronics, Vol. 14, No. 5, 564-574, 2009.

    30. Polinder, H. and M. J. Hoeijmakers, "Eddy-current losses in the permanent magnets of a PM machine," EMD 97,, No. 444, Sep. 1–3, 1997.