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

Huang, Yunkai; Guo, Baocheng; Hemeida, Ahmed; Sergeant, Peter

doi:10.3390/en9110892

Cited by 24 publications

(9 citation statements)

References 23 publications

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“…An alternative approach is the field reconstruction method (FRM) [11,12], which partially depends on the FEM. Although it is much faster than the FEM, it requires much time for modelling different eccentricity geometries [13]. In simulating a faulty PMSM with closed-loop vector control, the analytic approach based on the modified winding function approach allows efficient and convenient modelling of different eccentricity types, especially with regard to inductances under eccentricities, even though it is not as precise as the FEM, which considers all mechanical and physical properties [10,14,15].…”

Section: Introductionmentioning

confidence: 99%

Diagnosing and distinguishing rotor eccentricity from partial demagnetisation of interior PMSM based on fluctuation of high‐frequency d ‐axis inductance and rotor flux

Liu

Huang

2017

IET Electric Power Applications

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An appropriate and complete mathematical modelling approach is developed for an interior permanent magnet synchronous motor (PMSM) with general eccentricity. The relationships between air-gap eccentricity and simulated inductances in different coordinate frames are analysed in depth. Then, an analytical high-frequency inductance model of the interior PMSM with rotor eccentricity is developed. Based on this model, an online diagnostic approach is proposed, which includes estimation of the high-frequency d-axis inductance and permanent magnet (PM) flux. Thus the rotor eccentricity and PM partial demagnetisation can be detected and distinguished. Experimental results validate the proposed theory and fault diagnosis approach. Finally, an effective and reliable eccentricity indicator is presented. It is shown that analysis of the essential sources of fault characteristics facilitates motor fault diagnosis.

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Section: Introductionmentioning

confidence: 99%

Diagnosing and distinguishing rotor eccentricity from partial demagnetisation of interior PMSM based on fluctuation of high‐frequency d ‐axis inductance and rotor flux

Liu

Huang

2017

IET Electric Power Applications

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“…Generally, the air gap permeance is estimated and then performance parameters such as induced voltage and winding current for different types of eccentricity are determined using the air gap flux density. Finally, the frequencies corresponding to each eccentricity fault is detected using spectrum analysis [20–22].…”

Section: Introductionmentioning

confidence: 99%

Diagnosis and detection of dynamic eccentricity fault for permanent magnet transverse flux generator

Pourmoosa

Ghods

Faiz

et al. 2021

IET Electric Power Appl

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The authors analyse no-load and full-load performance of a permanent magnet transverse flux generators (PMTFGs) in fully aligned condition as well as under different types of mechanical faults including static eccentricity (SE), dynamic eccentricity (DE), inclined rotor (IR) and run-out (RO) faults. An analytical model is developed to calculate the airgap permeance. This permeance is used to estimate the flux density and backelectromotive force in the healthy and faulty machine. Performance of the machine is predicted using the proposed analytical model and verified by comparing it with the results obtained using three-dimensional time stepping finite element method. Finally, the spectra of stator current in the PMTFG under SE, DE, IR and OR faults are determined through which the amplitude of side-band components with a specific frequency pattern is extracted. It can detect the eccentricity fault precisely, recognise its type and determines its severity.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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

Cited by 24 publications

References 23 publications

Diagnosing and distinguishing rotor eccentricity from partial demagnetisation of interior PMSM based on fluctuation of high‐frequency d ‐axis inductance and rotor flux

Diagnosing and distinguishing rotor eccentricity from partial demagnetisation of interior PMSM based on fluctuation of high‐frequency d ‐axis inductance and rotor flux

Diagnosis and detection of dynamic eccentricity fault for permanent magnet transverse flux generator

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

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