Demagnetization faults detection in an axial flux permanent magnet synchronous generator

Barmpatza, Alexandra C.; Kappatou, J. C.

doi:10.1109/demped.2017.8062349

Cited by 10 publications

(3 citation statements)

References 23 publications

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“…where f demag are the frequencies of the fault related harmonics, fs is the fundamental frequency, p the number of machine poles pairs, and k an integer number. Previous studies [29,30] prove that this Equation can predict also the fault related harmonics in the EMF and stator current spectra of an AFPM synchronous machine with totally demagnetized magnets. In this article, it is examined whether this Equation is applicable in the case of the combined fault, in order to interpret the fault related harmonics.…”

Section: Fault Signature Analysismentioning

confidence: 88%

“…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%

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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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Section: Fault Signature Analysismentioning

confidence: 88%

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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“…In Ref. [32], different demagnetised magnet faults in a coreless AFPM synchronous generator were studied for a single rotor and a double rotor topology. In the case of single rotor topology, when one magnet was demagnetised, both even and fractional harmonics were created in the back‐emf and current spectrums.…”

Section: Substantive Analysismentioning

confidence: 99%

A systematic review on current research and developments on coreless axial‐flux permanent‐magnet machines

Habib

Zainuri

Seng

et al. 2022

IET Electric Power Appl

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In recent years, coreless axial-flux permanent-magnet (AFPM) machines have been gaining attention. Being coreless, these machines do not experience eddy current (hence hysteresis losses) and has lower cogging torque leading to higher efficiency. However, limitations such as high leakage flux and weak mechanical structure impede its wide application. The results of a systematic review on coreless AFPM machine research is presented, wherein a total of 123 studies have been selected through the Preferred Reported Items for Systematic Reviews and Meta-Analysis (PRISMA) protocol. About 55% of the articles have been published between 2017 and 2021, indicating recent attention of the researchers on coreless AFPM machines. More than 70% (87 out of 123) of the records have been published by IEEE, which proves the quality and acceptance of the studies. In two-thirds (77 out of 123) of the studies, single-stator double-rotor has been adopted as the machine topology, and in 71.8% (84 out of 123) cases, trapezoidal shape magnets have been used in conventional array. The key research areas on coreless AFPM identified through this review are to produce an efficient design for multiphase and multistage topology and develop lightweight rotor and stator structures.

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Line Current Spectrum Analysis as a Technique to Diagnose the Demagnetization Fault in Permanent Magnet Synchronous Motor

Gherabi

Toumi

Benouzza

et al. 2020

Lecture Notes in Electrical Engineering

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Demagnetization faults detection in an axial flux permanent magnet synchronous generator

Cited by 10 publications

References 23 publications

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

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

A systematic review on current research and developments on coreless axial‐flux permanent‐magnet machines

Line Current Spectrum Analysis as a Technique to Diagnose the Demagnetization Fault in Permanent Magnet Synchronous Motor

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