Static, dynamic and mixed eccentricity of induction motor

Polat, Abdullah; Ertugrul, Y. D.; Ergene, Lale T.

doi:10.1109/demped.2015.7303703

Cited by 24 publications

(12 citation statements)

References 9 publications

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“…Statik eksenel kaçıklık arızaları genelde rotorun oval olmasından veya motorun işletmeye alınması sırasında montajlama hatalarından kaynaklanır. Şekil 1'de eksenel kaçıklık arızaları grafiksel olarak görülmektedir (Faiz ve Moosavi, 2016), (Polat, 2015 Asenkron motorlarda eksenel kaçıklık arıza sonucu stator akımında meydana gelen yanband frekansları eşitlik 1'de verilen formül ile bulunur (Faiz ve Moosavi, 2016), (Benbouzid, 2000). 1burada f s şebeke frekansını, k tam sayıyı, k kutup sayısını, s ise motorun kaymasını ifade etmektedir.…”

Section: Asenkron Motor Arızalarıunclassified

Asenkron Motor Eksenel Kaçiklik Arizalarinin Shannon Entropi̇si̇ İle Anali̇zi̇

Ünsal

Güçlü

2019

Uludağ University Journal of the Faculty of Engineering

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Öz: Sanayide ve işletmelerde yoğun bir şekilde kullanılan asenkron motorların yaygın arızalarından bir tanesi de motorlarda meydana gelen eksenel kaçıklık arızalarıdır. Bu çalışmada üç fazlı sincap kafesli bir asenkron motorun eksenel kaçıklık arızaları Shannon entropisi ile incelendi. Eksenel kaçıklık arızaları asenkron motorun her iki kapağının iç kısmındaki rulman yatakları genişletilerek oluşturuldu. Genişletilen rulman yataklarına üç boyutlu yazıcıdan elde edilen bir burç yerleştirilerek rotorun eksenden 0,20 mm kaçık olarak çalışması sağlandı. Asenkron motor hem sağlam olarak hem de eksenel kaçıklık arızalı olarak %25, %50, %75 ve %100 yük altında çalıştırıldı. Her test durumu için stator akımı ve titreşim sinyalleri kaydedildi. Stator akımı ve titreşim sinyallerinin doğruluğu Fourier analizi ile kontrol edildi. Eksenel kaçıklık arızasının etkisi, motorun stator akımı ve titreşim sinyallerinin entropi değerleri hesaplanarak incelendi. Sağlam ve eksenel kaçıklık arızalı motorun akım ve titreşim sinyallerinin entropi değerleri karşılaştırıldı. Elde edilen sonuçlar; eksenel kaçıklık arızalarının titreşim sinyali entropi değerinde ciddi bir artışa sebep olduğu ancak stator akımı entropi değerinde anlamlı bir değişim göstermediğini göstermektedir. Elde edilen sonuçlardan titreşim sinyalleri entropi analizinin eksenel kaçıklık arızalarının tespitinde kullanılabileceği görülmektedir.

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Section: Asenkron Motor Arızalarıunclassified

Asenkron Motor Eksenel Kaçiklik Arizalarinin Shannon Entropi̇si̇ İle Anali̇zi̇

Ünsal

Güçlü

2019

Uludağ University Journal of the Faculty of Engineering

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“…The rotation axis can be placed anywhere between the first and second axis. Such a situation is called mixed eccentricity [3]. For correctly operating motors (healthy case), however, the center of the rotor and stator must be coincident.…”

Section: Dynamic Modeling Of Induction Motor Air Gap Eccentricity In mentioning

confidence: 99%

“…Moreover squirrel cage induction motors are currently dominating the market since they can even be operated under faulty conditions [1,2]. Motor faults are mainly caused by the windings, rotor, bearings, and air gap eccentricity and they have been analyzed and published by different researchers for many years [3,4]. In this paper, the focus will be on faults cused by air gap eccentricity.…”

Section: Introductionmentioning

confidence: 99%

“…The stator current was analyzed by means of the MRWA via MATLAB/Wavelet Toolbox. In the literature, there is no approach for the eccentricity failures with the wavelet analysis, they were investigated from either the tests or FEM based results [3,9]. The results were compared in terms of machine performance characteristics such as current, flux density, torque etc.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of The Effects of Eccentricity on Induction Motor via Multi-Resolution Wavelet Analysis

Polat¹,

Yïlmaz²,

Ergene³

2018

Electrica

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In this paper, a 2.2 kW squirrel cage induction motor having different degrees of static eccentricity is analyzed for fault detection using multi-resolution wavelet analysis (MRWA). The reference squirrel cage induction motor was simulated by using finite element method (FEM) and verified with the test results for the reference. Multi-resolution wavelet analysis was applied to decompose the high frequency components of flux density and current of the induction motor with different levels of eccenctricity. The effects of these components on the torque and vibration characteristics were also examined. The results show that MRWA could be a good alternative to fast fourier transform (FFT) in detecting air gap eccentricity in motors.

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“…[12] employs the stator current spectrum for the diagnosis of the mixed rotor eccentricity and also presents the effect of mixed eccentricity on the time variation of the torque. [13] briefly compares the peak value of the instantneous torque in the torque of an induction motor for a healthy case and cases with static, dynamic and mixed eccentricities but the results presented are not comprehensive enough to have a concrete conclusion. In this paper, we comprehensively investigate the effect of the dynamic rotor eccentricity on the electromagnetic torque of a cage induction machine numerically, using finite element analysis.…”

Section: Introductionmentioning

confidence: 99%

Influence of the rotor eccentricity on the torque of a cage induction machine

Silwal¹,

Rasilo

Belahcen³

et al. 2017

Archives of Electrical Engineering

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Abstract:The non-uniform air gap in an electrical machine caused by rotor eccentricity creates an asymmetrical flux-density distribution in the air gap. This can affect the nominal torque produced by the machine. Eccentricity also produces forces that act on the rotor which may also have an effect on the torque. Thus, it is important to know how the torque of the machine behaves. In this paper, the torque of a cage induction machine is studied when the machine has dynamic eccentricity. The study is performed using the finite element method and a magnetic vector potential formulation. The torque is calculated by the method of energy balance. The harmonic components of the torque are also analyzed. The results show that the machine under eccentricity does not exhibit the same torque as a normal healthy machine. The harmonic components around the first principal slot harmonic is most affected.

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Static, dynamic and mixed eccentricity of induction motor

Cited by 24 publications

References 9 publications

Asenkron Motor Eksenel Kaçiklik Arizalarinin Shannon Entropi̇si̇ İle Anali̇zi̇

Asenkron Motor Eksenel Kaçiklik Arizalarinin Shannon Entropi̇si̇ İle Anali̇zi̇

Investigation of The Effects of Eccentricity on Induction Motor via Multi-Resolution Wavelet Analysis

Influence of the rotor eccentricity on the torque of a cage induction machine

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