An accurate model of squirrel cage induction machines under stator faults

Devanneaux, V.; Dagues, B.; Faucher, J.; Barakat, Georges

doi:10.1016/s0378-4754(03)00083-1

Cited by 27 publications

(19 citation statements)

References 5 publications

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“…In this case the spectrum of the stator line current i A will be demonstrated, considering that the rotor axis is shifted by a certain value of the geometrical air gap thickness toward the first coil group of the stator phase A [11], [12]. The spectrum of the stator current of fig.…”

Section: Static Eccentricitymentioning

confidence: 97%

Diagnosis of Static Eccentricity in 400 kW Induction Machine Based on the Analysis of Stator Currents

Elawgali¹

2024

RE&PQJ

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Abstract. Current spectrums of a four pole-pair, 400 kW induction machine were calculated for the cases of full symmetry and static eccentricity. The calculations involve integration of 93 electrical plus four mechanical ordinary differential equations. Electrical equations account for variable inductances affected by slotting and eccentricities. The calculations were followed by Fourier analysis of the stator currents in steady state operation. Zooms of the current spectrums, around the 50 Hz fundamental harmonic as well as of the main slot harmonic zone, were included.The spectrums included in this paper are referred to both calculated and measured currents.

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Section: Static Eccentricitymentioning

confidence: 97%

Diagnosis of Static Eccentricity in 400 kW Induction Machine Based on the Analysis of Stator Currents

Elawgali¹

2024

RE&PQJ

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“…In this case the calculations have been performed considering combination of both static and dynamic eccentricity [4], [6], [13]. The stator current spectrum shown in fig.…”

Section: Mixed Eccentricitymentioning

confidence: 99%

“…Faulty bearings, rotor ellipticity, misalignment of the shaft with the rotor, etc. might cause eccentricity that is, in most general terms, a non uniform air-gap between stator and rotor [4]. This paper dealing with the case of mixed eccentricity, where there is a composition of both static and dynamic eccentricities, which means that the rotor rotation axis does not match with neither the stator symmetry axis nor the rotor symmetry axis [5], [6], [7].…”

Section: Introductionmentioning

confidence: 99%

Diagnosis of Mixed Eccentricity in 400 kW Induction Machine Based on Inspection of Stator Current Spectrums

Elawgali¹

2024

RE&PQJ

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Abstract. This paper dealing with diagnosis of induction machines affected by combined eccentricity via analyzing the sator curents, inspection of the current spectrums and predict the harmonics that present in the spectrums and represent an indication for this ailment . The machine under invistigation is a 400 kW, four pole-pair, squarelcage induction machine. The current spectrums were calculated for the cases of full symmetry and mixed eccentricity. The calculations presented in this paper, are based on the poly-harmonic model that accounting for static and dynamic eccentricity, stator and rotor slotting, parallel branches as well as cage asymmetry. The calculations were followed by Fourier analysis of the stator currents in steady state operation. The inspection of the current spectrums focusing on two main zones these are the 50 Hz fundamental harmonic zone and the main slot harmonic zone. The paper will include the zooms of the above mentioned zones to demonstrate the harmonics presented in each zone.The calculated spectrums will be compared with the spectrums of the real measured currents.

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“…4, the form of [R r ] rotor resistance matrix and [L r ] rotor inductance matrix can be easily derived (Devanneaux et al 2003).The equations describing the mechanical parts of system are:…”

Section: Mathematical Model Of the Scimmentioning

confidence: 99%

On-line fault diagnostics in operating three-phase induction motors by the active and reactive currents

Mabrouk

Zouzou

Khelif

et al. 2015

Int J Syst Assur Eng Manag

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Motor current stator analysis (MCSA) are usually used to detect the broken bars. In several industrial applications, like cement industry, the motor is subjected to load torque variations of low frequencies, which have effects similar to rotor faults in the current spectrum and result of diagnostic procedure may be ambigues. In this paper, we present a study based on the application of the instantaneous active and reactive courant signature analyses for discriminating broken rotor bars from mechanical load oscillation effects in operating three-phase squirrel cage induction motors. This method is attractive because it does not need to interrupt the operating system in its application and allows the user to ''see'' the diagnosis information in the same way as in the well-known MCSA, i.e., as sidebands next to the fundamental current component. This technique has been first tested through the simulation of induction motors using a mathematical model based on the modified winding-function approach (MWFA). Then, experimental results are presented in order to demonstrate the capability of the proposed tool for discriminating between a motor with broken rotor bars from a motor driven by an oscillating load.

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An accurate model of squirrel cage induction machines under stator faults

Cited by 27 publications

References 5 publications

Diagnosis of Static Eccentricity in 400 kW Induction Machine Based on the Analysis of Stator Currents

Diagnosis of Static Eccentricity in 400 kW Induction Machine Based on the Analysis of Stator Currents

Diagnosis of Mixed Eccentricity in 400 kW Induction Machine Based on Inspection of Stator Current Spectrums

On-line fault diagnostics in operating three-phase induction motors by the active and reactive currents

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