Broken rotor bars: their effect on the transient performance of induction machines

Penman, J.; Stavrou, Andréas

doi:10.1049/ip-epa:19960777

Cited by 32 publications

(19 citation statements)

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“…A well known limitation of squirrel cage induction machines --the strength and integrity of the endring to bar joint [1][2][3][4] --has presented an upper bound to their design speed range, often resulting in the selection of switched reluctance or permanent magnet synchronous machines for the highest speed applications.…”

Section: Introductionmentioning

confidence: 99%

Advanced Induction Motor Endring Design Features for High Speed Applications

Caprio¹,

Lelos²,

Herbst³

et al. 2005

IEEE International Conference on Electric Machines and Drives, 2005.

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-This paper presents advancements in induction motor endring design to overcome mechanical limitations and extend the operating speed range and joint reliability of induction machines.A novel end ring design met the challenging mechanical requirements of this high speed, high temperature, power dense application, without compromising electrical performance. Analysis is presented of the advanced endring design features including a non uniform cross section, hoop stress relief cuts, and an integrated joint boss, which reduced critical stress concentrations, allowing operation under a broad speed and temperature design range. A generalized treatment of this design approach is presented comparing the concept results to conventional design techniques. Additionally, a low temperature joining process of the bar/end ring connection is discussed that provides the required joint strength without compromising the mechanical strength of the age hardened parent metals. A description of a prototype 2 MW, 15,000 rpm flywheel motor generator embodying this technology is presented.

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Section: Introductionmentioning

confidence: 99%

Advanced Induction Motor Endring Design Features for High Speed Applications

Caprio¹,

Lelos²,

Herbst³

et al. 2005

IEEE International Conference on Electric Machines and Drives, 2005.

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“…Toliyat [16] and Penman [17] introduced models of the induction machine which enable transient analysis including the effect of broken bars. Qiu [18] proposed a time-varying frequency spectrum for the study of current during the transient.…”

Section: Introductionmentioning

confidence: 99%

The Use of the Wavelet Approximation Signal as a Tool for the Diagnosis of Rotor Bar Failures

Riera-Guasp

Antonino-Daviu

Roger‐Folch

et al. 2008

IEEE Trans. on Ind. Applicat.

126

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-The aim of this paper is to present a new approach for rotor bar failure diagnosis in induction machines. The method focuses on the study of an approximation signal resulting from the wavelet decomposition of the startup stator current.The presence of the left sideband harmonic is used as evidence of the rotor failure in most diagnosis methods based on the analysis of the stator current. Thus, a detailed description of the evolution of the left sideband harmonic during the startup transient is given in this paper; for this purpose, a method for calculating the evolution of the left sideband during the startup is developed and its results are physically explained. This paper also shows that the approximation signal of a particular level, obtained from the Discrete Wavelet Transform (DWT) of the startup stator current, practically reproduces the time evolution of the left sideband harmonic during the startup. The diagnosis method proposed here consists of checking if the selected approximation signal fits well the characteristic shape of the left sideband harmonic evolution described in the paper.The method is validated through laboratory tests. The results prove that it can constitute a useful tool for the diagnosis of rotor bar breakages.Index Terms-Broken rotor bars, fault diagnosis, startup transient, wavelet analysis.

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“…On-line monitoring and condition assessment of induction motors has been suggested for improving reliability, and for avoiding catastrophic failures [1]. The availability of accurate motor speed is critical for effective condition monitoring and diagnosis [2][3][4]. However, in many industrial set-ups, like a power plant, most of the motors have no permanently installed speed sensors.…”

Section: Introductionmentioning

confidence: 99%