Article metrics

  • citations in SCindeks: 0
  • citations in CrossRef:0
  • citations in Google Scholar:[=>]
  • visits in previous 30 days:13
  • full-text downloads in 30 days:10
article: 4 from 13  
Back back to result list
Serbian Journal of Electrical Engineering
2015, vol. 12, iss. 3, pp. 303-320
article language: English
document type: unclassified
published on: 27/11/2015
doi: 10.2298/SJEE1503303K
Calculation improvement of no-load stray losses in induction motors with experimental validation
University of Belgrade, Electrical Engineering Institute 'Nikola Tesla'

e-mail: mkostic@ieent.org

Project

Increase of energy efficiency in selected industrial sector through implementation of energy management system in small and medium-sized enterprises (MESTD - 33017)

Abstract

On the basis of the known fact that all air gap main flux density variations are enclosed by permeance slot harmonics, only one component of stray losses in rotor (stator) iron is considered in the new classification, instead of 2 components: rotor (stator) pulsation iron losses, and rotor (stator) surface iron losses. No-load rotor cage (high-frequency) stray losses are usually calculated. No-load stray losses are caused by the existence of space harmonics: the air-gap slot permeance harmonics and the harmonics produced by no-load MMF harmonics. The second result is the proof that the corresponding components of stray losses can be calculated separately for the mentioned kind of harmonics. Determination of the depth of flux penetration and calculations of high frequency iron losses are improved. On the basis of experimental validation, it is proved that the new classification of no-load stray losses and the proposed method for the calculation of the total value is sufficiently accurate.

Keywords

high frequency no-load losses; rotor (stator) iron no-load stray losses; rotor cage high-frequency losses; permeance slot harmonics; MMF harmonics

References

*** Induction motors 2.SRZKIT 423 Lk-6 1200 kW, 690V: Results of no-load high frequency losses measurement. Subotica, Serbia: ATB SEVER, Manufacturer document
Alger, P.L., Angest, G., Davies, E.J. (1959) Stray-load losses in polyphase induction machines. AIIE Transactions, vol. 78, Pt. III, Power Apparatus and Systems, June 1959, 349-357
Alger, P.L. (1957) Induced High-Frequency Currents in Squirrel-Cage Windings. Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems, 76(3): 724-729
Boldea, I., Nasar, S.A. (2002) The induction machines handbook. London: CRC Press LLC, www.crcpres.com
Carter, F.W. (1926) The magnetic field of the dynamo-electric machine. Journal of the Institution of Electrical Engineers, 64(359): 1115-1138
Chalmers, B.J., Narain, C.K. (1970) High-frequency no-load losses of cage induction motors. IEEE Transactions on Power Apparatus and System, vol.PAS-89, br. 6, str. 1043-1048
Chalmers, B.J., Richardson, J. (1966) Investigation of high frequency no-load losses in induction motors with open stator slots. IEE Proceedings, vol. 113, str. 1597-1605
Chalmers, B.J. (1970) Electromagnetic problems of A.C. machines. London, UK: Chapman & Hall
Christofides, N. (1965) Origins of load losses in induction motors with cast aluminium rotors. Proceedings of the Institution of Electrical Engineers, 112(12): 2317
Freeman, E.M. (1962) The calculation of harmonics, due to slotting, in the flux-density waveform of a dynamo-electric machine. Proceedings of the IEE Part C: Monographs, 109(16): 581
Heller, B., Hamata, V. (1977) Harmonic Field Effects in Induction Machines. Oxford, UK: Elsevier Scientific
Ivanov-Smolensky, A. (1982) Electrical Machines, Vol. 1 and 2. Moscow: Mir Publishers, vol. 2, Translated from the Russian
Jimoh, A.A., Findlay, R.D., Poloujadoff, M. (1985) Stray losses in induction machines: Part II, calculation and reduction. IEE Trans., PAS-104, str. 1506-1512
Jimoh, A.A., Findlay, R.D., Poloujadoff, M. (1985) Stray Losses in Induction Machines: Part I, Definition, Origin and Measurement,. IEE Trans., PAS-104, str. 1500-1512
Kostic, M. (2010) New Method for Estimation of Stray-Load Loss in Induction Motors. International Review of Electrical Engineering, Part A, Vol. 5, No. 2, pp. 447-453. April
Kostić, M. (2001) The calculation of the flux density's slot harmonics in (un) saturated induction machines. in: proc. ACMPO1 (IEEE IAS Conference), Kusadasi, Turkey, str. 117-122, June
Liwschitz, M.M. (1946) Differential leakage of a fractional-slot winding. Electrical Engineering, 65(5): 314-320
Radin, V.I., et all. (1990) Standard series of induction motors interelektro. Moscow, Russia: Energoatomizdat, In Russian
Schwarz, K.K. (1964) Survey of basic stray losses in squirrel-cage induction motors. Proceedings of the Institution of Electrical Engineers, 111(9): 1565
Taegen, F., Walczak, R. (1983) An Experimentally Verified Prediction of the Harmonic Fields of Squirrel Cage Induction Motors. Electrical Engineering, Vol. 66, No. 4, pp. 233-242; July; In German