Static Eccentricity Fault Diagnosis in an Accelerating No-Load Three-Phase Saturated Squirrel-Cage Induction Motor

Faiz, Jawad; Ebrahimi, Bashir Mahdi

doi:10.2528/pierb08081702

Cited by 20 publications

(8 citation statements)

References 27 publications

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“…It was essentially aimed at analysing rotor eccentricity effects in asynchronous and synchronous salient-pole machines in order to develop a suitable diagnosis technique, which is very important for improving machine life (e.g., [14]). …”

Section: Introductionmentioning

confidence: 99%

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Critical Review of the Modified Winding Function Theory

Serrano-Iribarnegaray¹,

Cruz-Romero²,

Gomez-Exposito³

2013

PIER

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Abstract-The Modified Winding Function Theory (MWFTh), regarded as a very powerful and general theory, has been extensively used for the last 15 years. This paper performs an in-depth review of the mathematical and physical framework on which the MWFTh is based, showing that it is indeed very well suited to analyse machines with small air gaps of arbitrary shape. However, contrary to what is usually stated in the literature, it is also proved that its general formulae fail when applied to large air gaps. This major finding is deduced from two different approaches, both of which are later reinforced by numerical examples. In spite of that, there is an important industrial field (diagnosis techniques of salient-pole synchronous machines eccentricities) in which good theoretical results have been reported by applying the MWFTh to these large air-gap machines. This issue is addressed and clarified in the paper.

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Section: Introductionmentioning

confidence: 99%

“…This equation can be easily compared with its more complex counterpart (14) where there are both radial and tangential H components (more details on these two components in Appendix A). If now, in addition to a radial path, we assume again the particular case of small air gap, following just the same procedure as above, we get:…”

Section: Analytical Reviewmentioning

confidence: 99%

Critical Review of the Modified Winding Function Theory

Serrano-Iribarnegaray¹,

Cruz-Romero²,

Gomez-Exposito³

2013

PIER

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“…These works also conclude that dynamic eccentricity does not generate new harmonic components in the stator currents, although it modifies the odd harmonics. Static eccentricity induces harmonic components in the stator current harmonics which can be localized as [9,10,[29][30][31]:…”

Section: Detection Of Air Gap Eccentricity Faults In Pma-synrm From Tmentioning

confidence: 99%

Detection of Eccentricity Faults in Five-Phase Ferrite-PM Assisted Synchronous Reluctance Machines

et al. 2017

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Air gap eccentricity faults in five-phase ferrite-assisted synchronous reluctance motors (fPMa-SynRMs) tend to distort the magnetic flux in the air gap, which in turn affects the spectral content of both the stator currents and the ZSVC (zero-sequence voltage component). However, there is a lack of research dealing with the topic of fault diagnosis in multi-phase PMa-SynRMs, and in particular, those focused on detecting eccentricity faults. An analysis of the spectral components of the line currents and the ZSVC allows the development of fault diagnosis algorithms to detect eccentricity faults. The effect of the operating conditions is also analyzed, since this paper shows that it has a non-negligible impact on the effectivity and sensitivity of the diagnosis based on an analysis of the stator currents and the ZSVC. To this end, different operating conditions are analyzed. The paper also evaluates the influence of the operating conditions on the harmonic content of the line currents and the ZSVC, and determines the most suitable operating conditions to enhance the sensitivity of the analyzed methods. Finally, fault indicators employed to detect eccentricity faults, which are based on the spectral content of the stator currents and the ZSVC, are derived and their performance is assessed. The approach presented in this work may be useful for developing fault diagnosis strategies based on the acquisition and subsequent analysis and interpretation of the spectral content of the line currents and the ZSVC.

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“…In this method, the directions of the magnetic flux lines must be known [5]. Studying faulty electrical machines needs precise mathematical models and MECM is not capable to diagnose the fault in the real cases [1,6]. Although, FEM gives accurate results, however, this method is time consuming especially for the analysis of electrical machines with asymmetry in the motor body such as air gap eccentricity.…”

Section: Introductionmentioning

confidence: 99%

Extension of Winding Function Theory for Radial and Axial Nonuniform Air Gap in Salient Pole Synchronous Machines

Akbari

Meshgin-Kelk²,

Milimonfared³

2011

PIER

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Abstract-In this paper, to calculate the salient pole machine inductances under radial and axial non-uniformity, a new method is developed. The method, an extension of the modified winding function theory to 3D, allows studying salient pole machines with radial and axial non-uniform air gap considering more realistic mean radius of the air gap. By using the developed method and a precise geometrical model, inductances of a salient pole machine with inclined rotor are calculated. Inductances are evaluated and effects of several asymmetries on inductances are shown. Calculated inductances are used in a coupled electromagnetic model, for simulation of a salient pole machine under healthy and different inclined eccentricity conditions. Simulation results show that the 19th stator current harmonic can be detected to alarm for inclined rotors. Experimental results that validate the theoretical and simulation results are presented.

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Static Eccentricity Fault Diagnosis in an Accelerating No-Load Three-Phase Saturated Squirrel-Cage Induction Motor

Cited by 20 publications

References 27 publications

Critical Review of the Modified Winding Function Theory

Critical Review of the Modified Winding Function Theory

Detection of Eccentricity Faults in Five-Phase Ferrite-PM Assisted Synchronous Reluctance Machines

Extension of Winding Function Theory for Radial and Axial Nonuniform Air Gap in Salient Pole Synchronous Machines

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