Detection of airgap eccentricity using line current spectrum of induction motors

Güldemir, Hanifi

doi:10.1016/s0378-7796(02)00154-2

Cited by 36 publications

(26 citation statements)

References 3 publications

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“…2). In this case, the airgap length can be approximated by g 0 (1 − e 0 cos θ), where e 0 is the relative degree of eccentricity [25]. In order to model the fault impact on the airgap length as a function of time, a series of Dirac generalized functions can then be used, as it is common in models for vibration analysis [18].…”

Section: A Airgap Length Variationsmentioning

confidence: 99%

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Models for Bearing Damage Detection in Induction Motors Using Stator Current Monitoring

Blodt

Granjon

Raison

et al. 2008

IEEE Trans. Ind. Electron.

468

193

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Section: A Airgap Length Variationsmentioning

confidence: 99%

“…Considering (25), the stator current in phase m is given by the derivation of the flux, leading to the following expression:…”

Section: B Effect On Flux Density and Stator Currentmentioning

confidence: 99%

Models for Bearing Damage Detection in Induction Motors Using Stator Current Monitoring

Blodt

Granjon

Raison

et al. 2008

IEEE Trans. Ind. Electron.

468

193

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“…However, due to unsuitable assembling and manufacturing process, an inherent level of static and dynamic eccentricity tends to coexist. In the case of static eccentricity, by assuming a smooth stator and rotor surface, the length of the airgap can be expressed as follows [27]:…”

Section: Current Characteristics Analysis Theorymentioning

confidence: 99%

Effects of the Slot Harmonics on the Stator Current in an Induction Motor with Bearing Fault

Song¹,

Hu²,

Zhu³

et al. 2017

Mathematical Problems in Engineering

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Bearing faults are the most frequent faults of induction motors. The current spectrum analysis is an easy and popular method for the monitoring and detection of bearing faults. After a presentation of the existing fault models, this paper illustrates an analytical approach to evaluate the effects of the slot harmonics on the stator current in an induction motor with bearing fault. Simple and clear theoretical analysis results in some new current characteristic frequencies. Experimental tests with artificial bearing outer raceway fault are carried out by measuring stator current signals. The experimental results by spectral analysis of the stator current agree well with the theoretical inference.

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“…The motor should be repaired or serviced in this condition. The three intervals for motor operation under eccentricity fault from manufacturing companies indicate 0-10% for healthy motor, 10-50% for faulty motor, and more than 50% is considered as the destructive interval of motor operation [35][36][37]. Table 5 shows the range of operation obtained for healthy, faulty, and destructive intervals and their corresponding torque values for these three regions from unaligned to aligned positions.…”

Section: D-torquementioning

confidence: 99%

Hybrid Method of Obtaining Degrees of Freedom for Radial Airgap Length in SRM Under Normal and Faulty Conditions Based on Magnetiostatic Model

Torkaman¹,

Afjei²

2010

PIER

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Abstract-In this paper, a new hybrid method of obtaining the degrees of freedom for redial airgap length in Switched Reluctance Motor operation under normal and faulty conditions based on magnetostatic analysis is presented. At the beginning, this method goes through the magnetic design of the motor utilizing three dimensional (3-D) Finite Element Method (FEM) in order to consider the end effects as well as axial fringing field effects. The motor parameters, such as torque, flux linkage, flux density versus rotor position are precisely obtained. Then, a Multi Layered Perception Neural Network is designed by considering the nonlinear behavior of the motor parameters obtained under different modes of operation. Using this network and the obtained parameters from FEM, an Objective Function (OF) for torque ripple with the aim of having a minimum mean square error is estimated. In addition, an improved Genetic Algorithm (GA) for the minimization the OF is also presented to determine the motor's operational regions. Finally, the legal intervals for different modes of motor operation are addressed.

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Detection of airgap eccentricity using line current spectrum of induction motors

Cited by 36 publications

References 3 publications

Models for Bearing Damage Detection in Induction Motors Using Stator Current Monitoring

Models for Bearing Damage Detection in Induction Motors Using Stator Current Monitoring

Effects of the Slot Harmonics on the Stator Current in an Induction Motor with Bearing Fault

Hybrid Method of Obtaining Degrees of Freedom for Radial Airgap Length in SRM Under Normal and Faulty Conditions Based on Magnetiostatic Model

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