Dynamic eccentricity in squirrel cage induction motors – Simulation and analytical study of its spectral signatures on stator currents

Sahraoui, Mohamed; Ghoggal, Adel; Zouzou, S. E.; Benbouzid, Mohamed

doi:10.1016/j.simpat.2008.08.007

Cited by 71 publications

(41 citation statements)

References 28 publications

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“…Since the relative permeance is inversely proportional to the air-gap length and the eccentricity can only affect the relative permeance [29], the radial air-gap flux density of a PMSM with eccentricity can be obtained by introducing the correction factor based on the air-gap flux density of a PMSM without eccentricity.…”

Section: Correction Factor Of Relative Permeancementioning

confidence: 99%

Analysis of Nonlinear Vibration in Permanent Magnet Synchronous Motors under Unbalanced Magnetic Pull

et al. 2018

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Abstract:The vibration and noise of permanent magnet synchronous motors (PMSM) are mainly caused by unbalanced magnetic pull (UMP). This paper aims to investigate nonlinear vibration in PMSMs. Firstly, the analytical model of the air-gap magnetic field with an eccentric rotor in PMSM is studied, and the analytical model is verified by the finite element method. Then the dynamic model of an offset rotor-bearing system is established, and the gyroscopic effect, nonlinear bearing force and UMP are taken into consideration. Finally, the dynamic characteristics of different static displacement eccentricities, rotor offsets and radial clearances are investigated in both the time domain and the frequency domain. The results show that the amplitudes of dynamic responses increase with the static displacement eccentricity and rotor offset and high integer multiples of rotating frequency appear with the increase of displacement eccentricity. The coupling effects of bearing force, unbalanced mass force and UMP are observed in the frequency domain, and the frequency components in the dynamic responses indicate that the bearings have an effect on the system.

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Section: Correction Factor Of Relative Permeancementioning

confidence: 99%

Analysis of Nonlinear Vibration in Permanent Magnet Synchronous Motors under Unbalanced Magnetic Pull

et al. 2018

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“…If both types of eccentricities are present, sideband components appear near the fundamental and some of its harmonics [28]. The frequencies of these components are given by (4), being k an integer:…”

Section: B Eccentricity Componentsmentioning

confidence: 99%

Induction Motor Diagnosis by Advanced Notch FIR Filters and the Wigner–Ville Distribution

Climente-Alarcón

Antonino-Daviu

Riera-Guasp

et al. 2014

IEEE Trans. Ind. Electron.

118

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Abstract-During the last years, several time-frequency decomposition tools have been applied for the diagnosis of induction motors, for those cases in which the traditional procedures, such as the Motor Current Signature Analysis (MCSA), cannot yield the necessary response. Among them, the Cohen distributions have been widely selected to study transient and even stationary operation due to their high resolution and detailed information provided at all frequencies. Their main drawback, the cross-terms, has been tackled either modifying the distribution, or carrying out a pretreatment of the signal before computing its time-frequency decomposition. In this paper, a filtering process is proposed that uses advanced notch filters in order to remove constant frequency components present in the current of an induction motor, prior to the computation of its distribution, to study rotor asymmetries and mixed eccentricities. In transient operation of machines directly connected to the grid, this procedure effectively eliminates most of the artifacts that have prevented the use of these tools, allowing a wideband analysis and the definition of a precise quantification parameter able to follow the evolution of their state.

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“…The initial work in the detection of eccentricity taking account rotor slot related formulas using MCSA and vibration was done by Cameron [9], since there many research works head to detect the eccentricity fault in induction motor using MCSA [10]- [11]- [12]. By another eye, several research works affirmed that MCSA has a limited usability to detect faults in induction motor especially in some cases.…”

Section: Fig 1 Types Of Eccentricity Faults (A) Concentric Rotor mentioning

confidence: 99%

Detection of Static Eccentricity Fault in Saturated Induction Motors by Air-Gap Magnetic Flux Signature Analysis Using Finite Element Method

Halem

Zouzou

Srairi

et al. 2015

J. Fundam and Appl Sci.

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Unfortunately, motor current signature analysis (MCSA) cannot detect the small degrees of the purely static eccentricity (SE) defects, while the air-gap magnetic flux signature analysis (FSA) is applied successfully. The simulation results are obtained by using time stepping finite elements (TSFE) method. In order to show the impact of magnetic saturation upon the diagnosis of SE fault, the analysis is carried out for saturated induction motors. The index signatures of static eccentricity fault around fundamental and PSHs are detected successfully for saturated motor.

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Dynamic eccentricity in squirrel cage induction motors – Simulation and analytical study of its spectral signatures on stator currents

Cited by 71 publications

References 28 publications

Analysis of Nonlinear Vibration in Permanent Magnet Synchronous Motors under Unbalanced Magnetic Pull

Analysis of Nonlinear Vibration in Permanent Magnet Synchronous Motors under Unbalanced Magnetic Pull

Induction Motor Diagnosis by Advanced Notch FIR Filters and the Wigner–Ville Distribution

Detection of Static Eccentricity Fault in Saturated Induction Motors by Air-Gap Magnetic Flux Signature Analysis Using Finite Element Method

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