Electromechanical interaction in rotordynamics of cage induction motors

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

Research output: Contribution to journalArticleScientificpeer-review

24 Citations (Scopus)

Abstract

Eccentric rotor motion induces an unbalanced magnetic pull between the rotor and stator of cage induction motors. Recently, a linear parametric model of this eccentricity force due to the arbitrary rotor motion was presented. The purpose of this study is to combine this electromagnetic force model with a simple mechanical rotor model, and further, to demonstrate the rotordynamic response induced by this electromechanical interaction. An electromechanical rotor model is derived on the basis of the Jeffcott rotor with two additional variables for the harmonic currents of the rotor cage. Applying this model, the rotordynamic effects of electromechanical interaction were studied. Three induction motors were used in the numerical examples. The electromechanical parameters of these motors were estimated from the numerical simulations carried out separately. The results obtained show that the electromechanical interaction may decrease the natural frequencies of the rotor, induce additional damping or cause rotordynamic instability. These interaction effects are most significant in motors operating at or near the first bending critical speed. Excluding the potential rotordynamic instability, the numerical results indicate that the electromechanical interaction reduces effectively the unbalance response close to the first bending critical speed.
Original languageEnglish
Pages (from-to)733-755
JournalJournal of Sound and Vibration
Volume284
Issue number3-5
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

Fingerprint

rotor dynamics
induction motors
Induction motors
rotors
Rotors
interactions
critical velocity
Rotors (windings)
stators
eccentrics
Stators
eccentricity
Natural frequencies
Damping
resonant frequencies
damping
electromagnetism
harmonics
Computer simulation
causes

Keywords

  • eccentric rotor
  • rotordynamics
  • rotors
  • unbalanced magnetic pull

Cite this

Holopainen, Timo ; Tenhunen, Asmo ; Arkkio, Antero. / Electromechanical interaction in rotordynamics of cage induction motors. In: Journal of Sound and Vibration. 2005 ; Vol. 284, No. 3-5. pp. 733-755.
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title = "Electromechanical interaction in rotordynamics of cage induction motors",
abstract = "Eccentric rotor motion induces an unbalanced magnetic pull between the rotor and stator of cage induction motors. Recently, a linear parametric model of this eccentricity force due to the arbitrary rotor motion was presented. The purpose of this study is to combine this electromagnetic force model with a simple mechanical rotor model, and further, to demonstrate the rotordynamic response induced by this electromechanical interaction. An electromechanical rotor model is derived on the basis of the Jeffcott rotor with two additional variables for the harmonic currents of the rotor cage. Applying this model, the rotordynamic effects of electromechanical interaction were studied. Three induction motors were used in the numerical examples. The electromechanical parameters of these motors were estimated from the numerical simulations carried out separately. The results obtained show that the electromechanical interaction may decrease the natural frequencies of the rotor, induce additional damping or cause rotordynamic instability. These interaction effects are most significant in motors operating at or near the first bending critical speed. Excluding the potential rotordynamic instability, the numerical results indicate that the electromechanical interaction reduces effectively the unbalance response close to the first bending critical speed.",
keywords = "eccentric rotor, rotordynamics, rotors, unbalanced magnetic pull",
author = "Timo Holopainen and Asmo Tenhunen and Antero Arkkio",
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Electromechanical interaction in rotordynamics of cage induction motors. / Holopainen, Timo (Corresponding Author); Tenhunen, Asmo; Arkkio, Antero.

In: Journal of Sound and Vibration, Vol. 284, No. 3-5, 2005, p. 733-755.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Electromechanical interaction in rotordynamics of cage induction motors

AU - Holopainen, Timo

AU - Tenhunen, Asmo

AU - Arkkio, Antero

N1 - Project code: V1SU00856

PY - 2005

Y1 - 2005

N2 - Eccentric rotor motion induces an unbalanced magnetic pull between the rotor and stator of cage induction motors. Recently, a linear parametric model of this eccentricity force due to the arbitrary rotor motion was presented. The purpose of this study is to combine this electromagnetic force model with a simple mechanical rotor model, and further, to demonstrate the rotordynamic response induced by this electromechanical interaction. An electromechanical rotor model is derived on the basis of the Jeffcott rotor with two additional variables for the harmonic currents of the rotor cage. Applying this model, the rotordynamic effects of electromechanical interaction were studied. Three induction motors were used in the numerical examples. The electromechanical parameters of these motors were estimated from the numerical simulations carried out separately. The results obtained show that the electromechanical interaction may decrease the natural frequencies of the rotor, induce additional damping or cause rotordynamic instability. These interaction effects are most significant in motors operating at or near the first bending critical speed. Excluding the potential rotordynamic instability, the numerical results indicate that the electromechanical interaction reduces effectively the unbalance response close to the first bending critical speed.

AB - Eccentric rotor motion induces an unbalanced magnetic pull between the rotor and stator of cage induction motors. Recently, a linear parametric model of this eccentricity force due to the arbitrary rotor motion was presented. The purpose of this study is to combine this electromagnetic force model with a simple mechanical rotor model, and further, to demonstrate the rotordynamic response induced by this electromechanical interaction. An electromechanical rotor model is derived on the basis of the Jeffcott rotor with two additional variables for the harmonic currents of the rotor cage. Applying this model, the rotordynamic effects of electromechanical interaction were studied. Three induction motors were used in the numerical examples. The electromechanical parameters of these motors were estimated from the numerical simulations carried out separately. The results obtained show that the electromechanical interaction may decrease the natural frequencies of the rotor, induce additional damping or cause rotordynamic instability. These interaction effects are most significant in motors operating at or near the first bending critical speed. Excluding the potential rotordynamic instability, the numerical results indicate that the electromechanical interaction reduces effectively the unbalance response close to the first bending critical speed.

KW - eccentric rotor

KW - rotordynamics

KW - rotors

KW - unbalanced magnetic pull

U2 - 10.1016/j.jsv.2004.07.007

DO - 10.1016/j.jsv.2004.07.007

M3 - Article

VL - 284

SP - 733

EP - 755

JO - Journal of Sound and Vibration

JF - Journal of Sound and Vibration

SN - 0022-460X

IS - 3-5

ER -