Influence of the rotor eccentricity on the torque of a cage induction machine

Bishal Silwal, Paavo Rasilo, Anouar Belahcen, Antero Arkkio

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
126 Downloads (Pure)


The non-uniform air gap in an electrical machine caused by rotor eccentricity creates an asymmetrical flux-density distribution in the air gap. This can affect the nominal torque produced by the machine. Eccentricity also produces forces that act on the rotor which may also have an effect on the torque. Thus, it is important to know how the torque of the machine behaves. In this paper, the torque of a cage induction machine is studied when the machine has dynamic eccentricity. The study is performed using the finite element method and a magnetic vector potential formulation. The torque is calculated by the method of energy balance. The harmonic components of the torque are also analyzed. The results show that the machine under eccentricity does not exhibit the same torque as a normal healthy machine. The harmonic components around the first principal slot harmonic is most affected.

Original languageEnglish
Pages (from-to)383-396
Number of pages14
JournalArchives of Electrical Engineering
Issue number2
Publication statusPublished - 27 Jun 2017
MoE publication typeA1 Journal article-refereed


  • cage induction machine
  • dynamic eccentricity
  • electromagnetic torque
  • energy balance
  • finite element method
  • harmonics


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