Русская версия English version
Home / 2026 issue 5 / Diagnostic of rotor windings of induction motors in rundown mode using an external magnetic field

Diagnostic of rotor windings of induction motors in rundown mode using an external magnetic field

D.A. Polkoshnikov, A.S. Strakhov, E.M. Novoselov, M.A. Zakharov, G.D. Smirnov, A.A. Skorobogatov

Vestnik IGEU, 2026 issue 5, pp. 53—61

Download PDF

Abstract in English: 

Background. Broken rotor bars in auxiliary motor rotors are a common cause of failures, leading to significant economic losses at power plants. One of the most promising methods for their timely detection is spectral analysis of the external magnetic field. However, the use of this method in rundown mode, which has several undeniable advantages, has received little attention. Thus, the purpose of this study is to detect special signs of broken rotor bars in the external magnetic field signal spectra of asynchronous motors in rundown mode, taking into account residual magnetization.

Materials and methods. The study has been conducted using simulation models of two induction motors developed in the Ansys software package. Spectral analysis of the external magnetic field induction has been used for monitoring, based on determining the harmonic amplitudes of a fictitious rotor winding. For processing, a short-time Fourier transform method is used applying the Flattop window function for more accurate determination of harmonic amplitudes.

Results. Frequency-time spectra have been analyzed for both motor models under varying loads. It has been shown that both in the presence of rotor winding currents and after their attenuation due to residual magnetization, the amplitudes of harmonics associated with the fictitious rotor winding significantly increase in the spectra of induction motors with broken rotor bars. Moreover, the higher the motor load in the pre-rundown mode, the greater the amplitudes of harmonics associated with the fictitious rotor winding.

Conclusions. The results of the research have confirmed the feasibility to detect rotor winding damage based on the increase in harmonic amplitudes associated with the fictitious rotor winding, existing in the external magnetic field of both high-voltage and low-voltage motors.

References in English: 

1. Siddiqui, K.M., Sahay, K., Giri, V.K. International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, 2014, vol. 3, issue 1, pp. 6549–6565.

2. Stefani, A., Bellini, A., Filippetti, F. IEEE Transaction on Industrial Electronics, 2009, vol. 56, no. 11, pp. 4548–4556.

3. Jahić, A., Hederić, Z., Atić, M. International Journal of Electrical and Computer Engineering Systems, 2015, vol. 6, no. 1, pp. 15–21.

4. Skorobogatov, A.A. Vestnik IGEU, 2006, issue 2, pp. 75–78.

5. Jarzyna, W. Diagnostic Characteretics of Axial Flux in an Induction Machine. Conference Publication “Electrical Machines and Drives”, 1995, no. 4, pp. 141–146.

6. Ceban, A., Pusca, R., Romary, R. IEEE Transactions on Industrial Electronics, May 2012, vol. 59, no. 5, pp. 2082–2093.

7. Alekseenko, A.Yu., Brodskiy, O.V., Vedeneev, V.N., Tonkikh, V.G., Khomutov, S.O. Vestnik AltGTU, 2006, no. 2, pp. 9–13.

8. Bel'skiy, I.O., Kupriyanov, I.S, Luk'yanov, A.V. Sistemy. Metody. Tekhnologii, 2018, no. 4, pp. 62–69.

9. Ceban, A., Fireteanu, V., Romary, R., Pusca, R., Taras, P. Finite Element Diagnosis of Rotor Faults in Induction Motors Based on Low Frequency Harmonics of the Near-Magnetic Field. IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics & Drives, Fault Modeling in Electrical Machines, Power Electronics and Drives. Bologna, Italy, 2011, pp. 192–198.

10. Nazarychev, A.N., Novoselov, E.M., Polkoshnikov, D.A., Strakhov, A.S., Skorobogatov, A.A., Pugachev, A.A. Defektoskopiya, 2020, no. 5, pp. 3–11.

11. Safiullin, R.A., Yangirov, I.F. Elektrotekhnicheskie i informatsionnye kompleksy i sistemy, 2021, vol. 17, no. 2, pp. 62–70.

12. Sokolova, O.V., Sokolov, I.S. Vestnik gosudarstvennogo universiteta morskogo i rechnogo flota im. admirala S.O. Makarova, 2019, vol. 11, no. 3, pp. 592–599.

13. Korf, A.A., Suvorov, I.F., Dedov, A.S., Ivanov, A.A., Shoyvanov, Yu.R. Diagnostika sostoyaniya podshipnikov asinkhronnogo dvigatelya 0,38 kV na osnove spektral′nogo sostava napryazheniya vybega [Diagnostic of condition of 0,38 kV induction motor bearings based on the spectral composition of the coast-down voltage]. Sbornik statey III Vserossiyskoy nauchno-prakticheskoy konferentsii “Nauka i obrazovanie: aktual'nye issledovaniya i razrabotki” [Proceedings of the 3rd All-Russian Scientific and Practical Conference “Science and Education: Current Research and Developments”]. Chita, 2020, pp. 124–130.

14. Potapenko, A.O., Yusupova, A.O., Latypov, S.I. Vestnik YuUrGU. Seriya Energetika, 2022, vol. 22, no. 1, pp. 62–70.

15. Novozhilov, A., Potapenko, A., Novozhilov, T. Przegląd elektrotechniczny, 2018, vol. 94, no. 6, pp. 33–37.

16. Supangat, R., Grieger, J., Ertugrul, N., Soong, W.L., Gray, D.A., Hansen, C.H. Detection of Broken Rotor Bar Faults and Effects of Loading in Induction Motors during Rundown. IEEE International Electric Machines & Drives Conference. Antalya, Turkey, 2007, vol. 1, pp. 196–201.

17. Polkoshnikov, D.A., Strakhov, A.S., Gavrilov, D.A., Novoselov, E.M., Skorobogatov, A.A. Issledovanie vliyaniya nagruzki i nesimmetrii pitayushchego napryazheniya na vneshnee magnitnoe pole v rezhime vybega elektrodvigatelya pri povrezhdenii obmotki rotora [Study of the effect of load and supply voltage asymmetry on the external magnetic field during electric motor coast-down under rotor winding fault conditions]. Materialy Mezhdunarodnoy nauchno-tekhnicheskoy konferentsii “Sostoyanie i perspektivy razvitiya elektro- i teplotekhnologii”. T. 1 (XXII Benardosovskie chteniya) [Proceedings of international scientific and technical conference “Current state and trends of the development of electrical and thermal technologies” (XXII Benardos Readings)]. Ivanovo, 2023, pp. 103–105.

18. Nazarychev, A.N., Polkoshnikov, D.A., Strakhov, A.S., Novoselov, E.M., Zakharov, M.A., Skorobogatov, A.A. Elektricheskie stantsii, 2025, no. 3(1124), pp. 29–38.

19. Kopylov, I.P., Klokov, B.K., Morozkin, V.P., Tokarev, B.F. Proektirovanie elektricheskikh mashin [Design of Electrical Machines]. Moscow: Izdatel'stvo Yurayt, 2011. 767 p.

20. Bogoroditskiy, N.P., Pasynkov, V.V., Tareev, B.M. Elektrotekhnicheskie materialy [Electrical engineering materials]. Leningrad: Energoatomizdat, Leningradskoe otdelenie, 1985. 304 p.

Key words in Russian: 
асинхронный двигатель, спектральный анализ, режим выбега, оконное преобразование Фурье, внешнее магнитное поле, обрыв стержней обмотки ротора, остаточная намагниченность
Key words in English: 
induction motor, spectral analysis, rundown mode, short-time Fourier transform, external magnetic field, broken rotor bars, residual magnetization
The DOI index: 
10.17588/2072-2672.2026.5.053-061
Downloads count: 
10