Development and thermal modeling of an induction machine

  • Abstract
  • Keywords
  • References
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  • Abstract

    In induction machines, the major concern is the temperature rise since it determines the maximum loading, in an attempt to avoid insula-tion deterioration and eventual loss of motor life. The effect of excessive heat in the motor stator and rotor windings and the stator mag-netic circuit can degrade the developed performance of the machine and also affect the motor loading and life span if not dispensed properly. This research work examines the thermal model for estimating the stator and rotor temperatures in cage induction motor. A state-variable model of the induction is used. The twin-axis stator reference frame is used to model the motor’s electrical behavior, because physical measurements are made in this reference frame. The thermal model is derived by considering the power dissipation, heat transfer and rate of temperature rise in the stator and rotor. The non-linear equations for electrical behavior of the motor and the thermal state equations for the stator and the rotor are solved using the MATLAB/Simulink blocks. This is to give room for the determination of the temperature of the stator and rotor windings inside the induction machine so as to evaluate the thermal stability of the induction motor and to check whether the insulation of the copper windings is sufficient at different operating conditions. It was found out from the thermal model analysis that the temperature of the stator and rotor windings increases due to stator and rotor copper losses which depend on the stator current. As the stator current is increased by increasing the torque, the temperature of each element is consequentially made to increase.



  • Keywords

    Induction Motor; Thermal Analysis; Modeling; MATLAB Simulation; Temperature.

  • References

      [1] Vincent Del Toro, ‘Electrical Engineering Fundamental and Practice – Hall India 2nd edition.pp.714-787, 2003.

      [2] P.S Bimbhra, “Generalized theory of Electrical machines’’ Khanna publishers India, fourth ed pp.179- 546, 1987

      [3] N.N. Hancock, “Matrix Analysis of Electrical machinery” Pergamon press, Oxford. New York. 2nd edition.

      [4] Gao Z, Habetter T.G, Harly R.G., Colby R.S., An Adaptive Kalmon Filtering approach to induction machine stator winding Temperature Estimation based on a Hybrid Thermal model, IEEE, 2005.

      [5] Information Guide for General Purpose industrial AC small and medium Squirrel- Cage induction motor standards, NEMA standard MGI-2003, Aug. 2003.

      [6] electrical engineering/ research/ electrical drives /publications/Documents/Väitöskirjat/ puranen-doctoral.pdf.

      [7] Bimal K.Bose, modern power electronics and AC drives, prentice Hall PTR 2002

      [8] Charles I. Hubert, Electric machines-theory, Operation applications, adjustment, and control, PEARSON 2002

      [9] Mellor et al, “Lumped parameter thermal model for electrical machines of TEFC design”, proceedings B, Vol.138. No. 5, april 1991

      [10] Yan G. Lee, “Thermal analysis of induction motor with forced cooling channels”. IEEE, magnetic, Vol.36, NO 4, July 2000

      [11] Mario J. Duran. “Lumped parameter thermal model for induction motors. IEEE, energy conversion Vol. 15, June 2004.

      [12] Sreehivasan and Sen Gupta, “Thermal design of totally enclosed fan cooled induction motors”. IEEE winter PES, NY 1977.

      [13] Dokopoulos and Xypteras, “Analysis of transient temperature distribution in a rotating machine”, electrical machines, Sept 1982.

      [14] Oti Stephen Ejiofor, Nwosu Cajethan Abuchi, Nnadi Damian B.N. and Ogbonnaya I.Okoro, Performance Study of three-phase Induction Motor driving a load: DISCOVERY Journal, Vol. 55, Issue 282, pp. 279-290, June 2019.

      [15] Ogbonnaya I. Okoro, “Steady and Transient states Thermal Analysis of a 7.5KW squirrel-cage induction machine at rated- Load Operation”. IEEE Energy Conversion, Vol. 20. No. 4, December 2005.

      [16] Oti Stephen Ejiofor, Nwosu Cajethan Abuchi, Nnadi Damian B.N. and Madueme Victory, ‘Simulating Performance Characteristics of Induction Motor under a Balanced Load by Direct On-line Starting’: International Journal of Engineer-ing & Technology, Vol. 7, Issue 4, pp. 6851-6855, 2018.

      [17] Williamson and Walker, “Calculation of stall bar temperature rise”, 5th Int. Conference on electrical machines and drives. September 1991.

      [18] Power Witzak, “The transient heat flow in stator of the high voltage induction motor”, Evaluation and modern aspects of induction machines, July 1986.

      [19] Gnffith and McCoy, “Induction motor Squirrel cage rotor winding thermal analysis,” IEEE, Vol-EC-1, N-3, Sept. 1986.

      [20] Yuangjiang Liu, “3D thermal stress analysis of the rotor of an induction motor,” IEEE, magnetic, vol. 36, No. 4, July 2000.

      [21] Siyambalapitiya et al, “Transient thermal Characteristics of induction motor rotor Cage”. IEEE, V-3, N-4, Dec 1988.

      [22] Rajagopal et al, “Axi- Symetric Steady state thermal analysis of totally enclosed fan cooled induction motors using FEM”, CAD/CAM, August 1994.

      [23] Tungpimolrut, K., Peng, F., and Fukao, T., “Robust Vector Control of induction motor without using stator and rotor circuit time constant,” IEEE Trans., 1994, 1A-30, (5), pp. 1241-1246.

      [24] Boys, J.T., and Miles, M.J. “Emperical thermal model for inverter-driven cage induction motor”, IEEE proc. Electrical Power. April 1994, 141, (6), pp. 360-372.

      [25] Al-Tayie, J.K. “Speed and temperature estimation in the brushed DC motor and Cage induction using the extended Kalman filter”. PhD thesis, Department of Electrical and Electronic Engineering, University of New Castle. June 1996.

      [26] Gerlando, A.D., and Vistoli, I., “Improved thermal modelling of induction motor for design purposes”. Proceedings of IEEE 6th international conference on Electrical machines and drives, Oxford, 1993, pp. 381-386.

      [27] Nestler, H., and sattler, P.k.: “On-line estimation of temperatures in electrical machines by an observer”. Conference record of ICEM 90, Cambridge, MA, USA. 1990, Vol. 3, pp. 874-879.

      [28] Guenov, S.Y., FloroV, P.I., and Ibeh, C.C.: “Steady state thermal analysis of induction motors by finite element method”. Conference record of ICEM 92, Manchester, UK, 1992, pp. 948-952.

      [29] Sen Gupta, D.P., and Lynn, JW. ‘Electrical machine dynamics’ (Macmillan, 1980).

      [30] Jones, C.V.: ‘The unified theory of electrical of electrical machines’ (Butterworth, 1967).




Article ID: 29727
DOI: 10.14419/ijet.v8i4.29727

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