Impulse method to calculate the frequency response of the electromagnetic forces on whirling cage rotors

A. Tenhunen, Timo Holopainen, A. Arkkio

Research output: Contribution to journalArticleScientificpeer-review

22 Citations (Scopus)

Abstract

An impulse method to calculate the frequency response of the electromagnetic forces acting between the rotor and stator of a cage induction motor when the rotor is in whirling motion is presented. Time-stepping finite element analysis is used to solve the magnetic field and the forces are calculated from the airgap field based on the principle of virtual work. The impulse response method is applied to the finite element analysis by moving the rotor from its central position for a short period of time. This displacement excitation disturbs the magnetic field, and this produces forces between the rotor and stator. Using spectral analysis techniques, the frequency response function is calculated using the excitation and response signals. The forces are calculated from the frequency response function. The forces calculated by impulse response method are compared with those calculated by a conventional computation. The results show very good agreement. The use of the impulse method to calculate the forces in electrical machines is also discussed.
Original languageEnglish
Pages (from-to)752-756
Number of pages5
JournalIEE Proceedings: Electric Power Applications
Volume150
Issue number6
DOIs
Publication statusPublished - 2003
MoE publication typeA1 Journal article-refereed

Fingerprint

Frequency response
Rotors (windings)
Rotors
Impulse response
Stators
Magnetic fields
Finite element method
Induction motors
Spectrum analysis

Keywords

  • rotordynamics
  • rotors
  • stator
  • whirling frequency
  • frequency response
  • whirling cage rotors
  • impulse method

Cite this

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title = "Impulse method to calculate the frequency response of the electromagnetic forces on whirling cage rotors",
abstract = "An impulse method to calculate the frequency response of the electromagnetic forces acting between the rotor and stator of a cage induction motor when the rotor is in whirling motion is presented. Time-stepping finite element analysis is used to solve the magnetic field and the forces are calculated from the airgap field based on the principle of virtual work. The impulse response method is applied to the finite element analysis by moving the rotor from its central position for a short period of time. This displacement excitation disturbs the magnetic field, and this produces forces between the rotor and stator. Using spectral analysis techniques, the frequency response function is calculated using the excitation and response signals. The forces are calculated from the frequency response function. The forces calculated by impulse response method are compared with those calculated by a conventional computation. The results show very good agreement. The use of the impulse method to calculate the forces in electrical machines is also discussed.",
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author = "A. Tenhunen and Timo Holopainen and A. Arkkio",
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Impulse method to calculate the frequency response of the electromagnetic forces on whirling cage rotors. / Tenhunen, A.; Holopainen, Timo; Arkkio, A.

In: IEE Proceedings: Electric Power Applications, Vol. 150, No. 6, 2003, p. 752-756.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Impulse method to calculate the frequency response of the electromagnetic forces on whirling cage rotors

AU - Tenhunen, A.

AU - Holopainen, Timo

AU - Arkkio, A.

N1 - Project code: V1SU00856

PY - 2003

Y1 - 2003

N2 - An impulse method to calculate the frequency response of the electromagnetic forces acting between the rotor and stator of a cage induction motor when the rotor is in whirling motion is presented. Time-stepping finite element analysis is used to solve the magnetic field and the forces are calculated from the airgap field based on the principle of virtual work. The impulse response method is applied to the finite element analysis by moving the rotor from its central position for a short period of time. This displacement excitation disturbs the magnetic field, and this produces forces between the rotor and stator. Using spectral analysis techniques, the frequency response function is calculated using the excitation and response signals. The forces are calculated from the frequency response function. The forces calculated by impulse response method are compared with those calculated by a conventional computation. The results show very good agreement. The use of the impulse method to calculate the forces in electrical machines is also discussed.

AB - An impulse method to calculate the frequency response of the electromagnetic forces acting between the rotor and stator of a cage induction motor when the rotor is in whirling motion is presented. Time-stepping finite element analysis is used to solve the magnetic field and the forces are calculated from the airgap field based on the principle of virtual work. The impulse response method is applied to the finite element analysis by moving the rotor from its central position for a short period of time. This displacement excitation disturbs the magnetic field, and this produces forces between the rotor and stator. Using spectral analysis techniques, the frequency response function is calculated using the excitation and response signals. The forces are calculated from the frequency response function. The forces calculated by impulse response method are compared with those calculated by a conventional computation. The results show very good agreement. The use of the impulse method to calculate the forces in electrical machines is also discussed.

KW - rotordynamics

KW - rotors

KW - stator

KW - whirling frequency

KW - frequency response

KW - whirling cage rotors

KW - impulse method

U2 - 10.1049/ip-epa:20030192

DO - 10.1049/ip-epa:20030192

M3 - Article

VL - 150

SP - 752

EP - 756

JO - IET Electric Power Applications

JF - IET Electric Power Applications

SN - 1751-8660

IS - 6

ER -