Unbalanced magnetic pull induced by arbitrary eccentric motion of cage rotor in transient operation. Part 1: Analytical model

Timo Holopainen (Corresponding Author), Asmo Tenhunen, Erkki Lantto, Antero Arkkio

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28 Citations (Scopus)


Eccentric rotor motion of an electric motor induces an unbalanced magnetic pull. This eccentricity force may couple the electromagnetic system with the flexural vibration modes of the shaft. This paper presents an analytic model for this eccentricity force allowing an arbitrary rotor motion and transient operation. The general equations were simplified for the constant flux and steady-state operation. These simplified equations correspond well to the results presented earlier.
Original languageEnglish
Pages (from-to)13-24
JournalElectrical Engineering
Issue number1
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed



  • analytical methods
  • eccentric rotor
  • induction motors
  • mathematical models
  • unbalanced magnetic pull

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