Numerical Analysis of the Power Balance of an Electrical Machine with Rotor Eccentricity

B. Silwal*, P. Rasilo, Lauri Perkkiö, A. Hannukainen, T. Eirola, A. Arkkio

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)


The power balance in the numerical simulation of a cage induction machine with eccentric rotor has been studied. The asymmetrical air-gap flux density distribution caused by the non-uniform air gap due to eccentricity produced forces that play an important role in the rotor dynamic stability. These forces act both in the radial and the tangential directions. The tangential force together with the whirling motion produces additional power in the shaft. If the power balance of the simulation satisfies, the power due to the whirling can be calculated from the power balance. This could also give a new approach to compute the forces due to eccentricity or verify the existing force computation methods. The error in the power balance of an eccentric machine has been calculated and the sources of the errors have been illustrated and discussed.

Original languageEnglish
Article number7207504
JournalIEEE Transactions on Magnetics
Issue number3
Publication statusPublished - 1 Mar 2016
MoE publication typeA1 Journal article-refereed


  • 2-D analysis
  • Cage induction machine
  • forces
  • power balance
  • rotor eccentricity
  • rotordynamics
  • time-stepping finite element method
  • torque


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