Advanced SearchSearch Tips
Influence of Thermal Expansion on Eccentricity and Critical Speed in Dry Submersible Induction Motors
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Influence of Thermal Expansion on Eccentricity and Critical Speed in Dry Submersible Induction Motors
Lv, Qiang; Bao, Xiaohua; He, Yigang;
  PDF(new window)
Rotor eccentricity is one of the major factors that directly influence the security of horizontal electrical machines, and the critical speed of the shaft has a close relationship with vibration. This paper deals with the influence of thermal expansion on the rotor eccentricity and critical speed in large dry submersible motors. The dynamic eccentricity (where the rotor is still turning around the stator bore centre but not its own centre) and critical speed of a three-phase squirrel-cage submersible induction motor are calculated via hybrid analytical/finite element method. Then the influence of thermal expansion is investigated by simulation. It is predicted from the study that the thermal expansion of the rotor and stator gives rise to a significant air-gap length decrement and an inconspicuous slower critical speed. The results show that the thermal expansion should be considered as an impact factor when designing the air gap length.
Critical speed;Dynamic eccentricity;Submersible motor;Thermal expansion;
 Cited by
Current analysis of large submersible motor under curved eccentricity by multi-loop method, International Journal of Applied Electromagnetics and Mechanics, 2017, 53, 1, 63  crossref(new windwow)
J. Faiz, B. M. Ebrahimi, B. Akin, and H. A. Toliyat, "Finite-element trainsient analysis of induction motors under mixed eccenrticity fault," IEEE Transactions on Magnetics, Vol. 44, No. 1, pp. 66-74, Jan. 2008. crossref(new window)

G. M. joksimovic, M. D. Durovic, J. Penman, and N. Arthur, "Dynamic simulation of dynamic eccentricity in induction machines-winding function approach," IEEE Transactions on Energy Conversion, Vol. 15, No. 2, pp. 143-148, Jun. 2000. crossref(new window)

D. Basak, A. Tiwari, and S. P. Das, "Fault diagnosis and condition monitoring of electrical machines-A review," IEEE Internatinal Conference on Industrial Technology, pp. 3061-3066. Dec. 2006.

D. G. Dorrell, "Sources and characteristics of unbalanced magnetic pull in three-phase cage induction motors with axial-varying rotor eccentricity," IEEE Transactions on industry Applicatinos, Vol. 47, No. 1, pp. 12-24, Jan/Feb. 2011. crossref(new window)

Charles F. Smith, and Eric M. Johnson, "The losses in induction motors arising from eccentricity of the rotor," Journal of the Institution of Electrical Engineers, Vol. 48, No. 212, pp. 546-569, 1921.

J. Faiz, B. M. Ebrahimi, B. Akin, and H. A. Toliyat, "comprehensive eccentricity fault diagnosis in induction motors using finite element method," IEEE Transactions on Magnetics, Vol. 45, No. 3, pp. 1764-1767. Mar. 2009. crossref(new window)

J. Faiz, B. M. Ebrahimi, H. A. Toliyat, and B Akin, "Diagnosis of a mixed eccentricity fault in a squirrelcage three-phase induction motor using time stepping finite element technique," IEEE International Conference on Electric Machines & Drives, Vol. 2, pp. 1446-1450, May. 2007.

D. Matic, F. Kulic, M. Pineda-Sanchez, and J. Pons-Llinares, "Artificial neural networks eccentricity fault detection of induction motor," IEEE International Multi-Conference on Computing in the Global Information Technology, pp. 1-4, Sep. 2010.

S. M. A. Cruz, A. J. M. Cardoso, and H. A. Toliyat, "Diagnosis of stator, rotor and airgap eccentricity faults in three-phase induction motors based on the multiple reference frames theory," IEEE International Conference on Industry Applications, Vol. 2, pp. 1340-1346, Oct. 2003.

A. Negoita, and R. M. Ionescu, "Influence of rotor static eccentricity on the noise level of a squirrel cage induction motor," IEEE International Conference on Environment and Electrical Engineering, pp. 1-4, May. 2011.

J. R. Cameron, W. T. Thomson, and A. B. Dow, "Vibration and current monitoring for detecting airgap eccentricity in large induction motors," IEEE Proceedings B Electric Power Applications, Vol. 133, No. 3, pp. 155-163, May. 1986. crossref(new window)

D. G. Dorrell, W. T. Thomson, and S. Roach, "Analysis of airgap flux, current, and vibration signals as a function of the combination of static and dynamic airgap eccentricity in 3-phase induction motors," IEEE Transactions on Industry Applications, Vol. 33, No. 1, pp. 24-34, Jan. 1997. crossref(new window)

D. G. Dorrell, "Calculation of unbalanced magnetic pull in small cage induction motors with skewed rotors and dynamic rotor eccentricity," IEEE Transactions on Energy Conversion, Vol. 11, No. 3, pp. 483-488. Sep. 1996. crossref(new window)

Wang Tianyu, Wang Fengxiang, Bai Haoran, and Cui Hong, "Stiffness and critical speed calculation of magnetic bearing-rotor system based on FEA," International Conference on Electrical Machines and Systems, pp. 575-578, Oct. 2008.

Yu Shenbo, Jiao Shi, Yuan Jing, and Zhao Yonghui, "Calculation of rotor critical speeds from permanent magnet synchronous machine," International Conference on electrical and Control Engineering, pp. 3439-3442. Jun. 2010.

R. Belmans, W. Heylen, A. Vandenput, and W. Geysen, "Influence of rotor-bar stiffness on the critical speed of an induction motor with an aluminium squirrel cage," IEEE Proceedings B Electric Power Applications, Vol. 131, No. 5, pp. 203-208. Sep. 1984. crossref(new window)

Huang Jian, "Fault treatment of vibratoin caused by temperature rising in induction motor," Huadian Technology, Vol. 32, No. 11, pp. 44-49, Nov. 2010.

E. Wiedemann, W. Kellenberger, Construction of electrical machine, Beijing, China machine press. Sep. 1976.