Detection of Static Eccentricities in Axial-Flux Permanent-Magnet Machines With Concentrated Windings Using Vibration Analysis

Ogidi, Oladapo O.; Barendse, Paul; Khan, Azeem

doi:10.1109/tia.2015.2448672

Cited by 30 publications

(15 citation statements)

References 45 publications

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“…In the case of static eccentricity, the non-uniformity of the air gap and therefore flux is time independent [15]. Severe static eccentricity can give rise to unbalanced magnetic pull, and therefore causes shaft flexing and dynamic eccentricity [2]. For the case of dynamic eccentricity, the centre of the rotor is not exactly the centre of the stator core and the minimum air gap position will rotate with the rotor.…”

Section: B Eccentricity Related Faultsmentioning

confidence: 99%

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Fault Signal Propagation Through the PMSM Motor Drive Systems

Sumner

Padilla

et al. 2017

IEEE Trans. on Ind. Applicat.

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Abstract -This paper describes how a mechanical disturbance on the shaft of a variable speed permanent magnet motor (PMSM) is propagated to the supply input side of the drive system, and therefore may be detected by monitoring specific frequency components in the rectifier input current. The propagation of the disturbance from the torque disturbance, to the motor current, then to the dc link current and finally to the rectifier input current is derived as a series of transfer functions so that both the frequency and the amplitude of the disturbance component in the rectifier input current can be predicted for a specific mechanical disturbance. The limitations to detect the mechanical fault by monitoring only the supply currents are also addressed. Simulation and experimental results are presented to demonstrate the accuracy of the quantitative analysis, and the potential for fault detection using the rectifier input currents.

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Section: B Eccentricity Related Faultsmentioning

confidence: 99%

“…Many diagnostics methods have been investigated and applied, such as monitoring of vibration [1,2], the flux measurement [3], and the thermal monitoring [4]. These techniques tend to be employed for larger industrial drives and generators.…”

mentioning

confidence: 99%

Fault Signal Propagation Through the PMSM Motor Drive Systems

Sumner

Padilla

et al. 2017

IEEE Trans. on Ind. Applicat.

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“…(c) The first step in modeling the eccentricity is to evaluate the air gap length in SE condition [23], the SE factor can be defined as:…”

Section: Model Of Static Eccentricitymentioning

confidence: 99%

Analytical Modeling of Static Eccentricities in Axial Flux Permanent-Magnet Machines with Concentrated Windings

et al. 2016

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Abstract:The aim of this paper is to calculate the static eccentricity (SE) of a double rotor axial flux permanent magnet (AFPM) machine by using a general analytical model. The flux density in the air gap under healthy conditions is calculated firstly, where the axial and circumferential magnetic flux densities are obtained using a coupled solution of Maxwell's equations and Schwarz-Christoffel (SC) mapping. The magnetic flux densities under SE conditions are calculated afterwards using a novel bilinear mapping. Some important electromagnetic parameters, e.g., back electromotive force (EMF), cogging torque and electromagnetic (EM) torque, are calculated for both SE and healthy conditions, and compared with the finite element (FE) model. As for the double rotor AFPM, SE does not contribute much effect on the back EMF and EM torque, while the cogging torque is increased. At each calculated section, FE models were built to validate the analytical model. The results show that the analytical predictions agree well with the FE results. Finally, the results of analytical model are verified via experimental results.

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“…During recent years, the demagnetization and the eccentricity fault have also been studied in the AFPM synchronous machine. More specifically [2,[8][9][10][11][12][13][14][15][16][17][18][19][20][21]] study the eccentricity fault, while [21][22][23][24][25][26][27][28][29][30] investigate the demagnetization fault in AFPM synchronous machines. In [31] a combined eccentricity and demagnetization fault in a double-sided AFPM synchronous machine using a time analytical model is presented.…”

Section: Introductionmentioning

confidence: 99%

Study of a Combined Demagnetization and Eccentricity Fault in an AFPM Synchronous Generator

Barmpatza

Kappatou

2020

Energies

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This article investigates the combined partial demagnetization and static eccentricity fault in an Axial Flux Permanent Magnet (AFPM) Synchronous Generator. The machine is simulated using 3D FEM, while the EMF spectrum is analyzed in order to export the fault related harmonics using the FFT analysis. Firstly, the partial demagnetization fault, without the coexistence of eccentricity, and both the static angular and axis eccentricity faults, without the coexistence of partial demagnetization, are studied. In the case of eccentricity fault, the phase EMF sum spectrum has also been used as a diagnostic mean, because, when only eccentricity fault exists in the generator (either angular or axis) new harmonics do not appear in the EMF spectrum. Secondly the combination of partial demagnetization fault with static axis and static angular eccentricity is investigated and different comparisons are made when the demagnetization and the eccentricity level changes. The investigation revealed that the combination of eccentricity and demagnetization creates new harmonics in the EMF spectrum. The novelty of the article is that these combined faults are studied for the first time in the international literature, and the phase EMF sum spectrum has not been previously used for eccentricity diagnosis in this machine type.

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Detection of Static Eccentricities in Axial-Flux Permanent-Magnet Machines With Concentrated Windings Using Vibration Analysis

Cited by 30 publications

References 45 publications

Fault Signal Propagation Through the PMSM Motor Drive Systems

Fault Signal Propagation Through the PMSM Motor Drive Systems

Analytical Modeling of Static Eccentricities in Axial Flux Permanent-Magnet Machines with Concentrated Windings

Study of a Combined Demagnetization and Eccentricity Fault in an AFPM Synchronous Generator

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