Detection of static eccentricity faults in AFPM machine with asymmetric windings using vibration analysis

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

doi:10.1109/icelmach.2014.6960388

Cited by 5 publications

(4 citation statements)

References 31 publications

(35 reference statements)

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“…The pulsation is triggered by amplified magnitudes of both space and sub-harmonics in the line current [33]. The space harmonics is defined by (8) [35], where = 1,2,3 … and = 3; yielding = +1, −2, +4 …, where the sign is indicative of the direction of rotation while the SE-related sub-harmonics frequency pattern are given in (9) [43].…”

Section: A Load Torque Oscillationmentioning

confidence: 99%

“…AFPM machine is inherently a 3D and complex geometry; therefore physical modelling of SE is difficult. However, the 2D plane in Fig.1 is used to reduce the scale of its geometry [35]. The machine analysed in this work is the surface-mounted AFPM, iron core, single-sided (single-rotor, single-stator) topology.…”

Section: B Analysis Of Electromagnetic Exciting Force Harmonicsmentioning

confidence: 99%

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

Ogidi

Barendse

Khan

2015

IEEE Trans. on Ind. Applicat.

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Section: A Load Torque Oscillationmentioning

confidence: 99%

Section: B Analysis Of Electromagnetic Exciting Force Harmonicsmentioning

confidence: 99%

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

Ogidi

Barendse

Khan

2015

IEEE Trans. on Ind. Applicat.

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“…The change in rotor speed caused by eccentric rotation not only changes the frequency of vibration components [5], but also converts the dynamic rotor vibration energy of eccentric mass into electrical energy [6]. Permanent magnet motors with increased mechanical power will also be disturbed by unbalanced vibration [7]. Therefore, the off-center rotation of the threshing drum still exists under no-load condition, which causes the trajectory of the threshing drum axis to change.…”

Section: Introductionmentioning

confidence: 99%

Effects of Unbalanced Incentives on Threshing Drum Stability during Rice Threshing

Que,

Tang,

Wang

et al. 2024

Agriculture

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As a result of the uneven growth of rice, unbalanced vibration of threshing drum caused by stalk entanglement in combine harvester is more and more severe. In order to reveal the influence of unbalanced excitation on the roller axis locus during rice threshing, the stability of threshing drum was studied. The dynamic signal test and analysis system are used to test the axial trajectory of threshing drum. At the same time, the influence of the unbalanced excitation caused by the axis winding on the axis trajectory is analyzed by the experimental results. Axis locus rules under no-load and threshing conditions are obtained. In order to simulate the axial and radial distribution of unbalanced excitation along the threshing drum, the counterweight was distributed on the threshing drum instead of the entangled stalk. Then, the definite effect of unbalanced excitation on the rotating stability of threshing drum is analyzed. Results show that the amplitude of stem winding along the grain drum is larger in the vertical direction and smaller in the horizontal direction when compared with the unloaded state under 200 g weight. It was found that the amplitude in both horizontal and vertical directions decreased after 400 g and 600 g counterweights were added, respectively, to simulate the radial distribution of stalk winding along the grain barrel. Finally, it can be seen that with the increase in the weight of the counterweight, the characteristics of the trajectory misalignment of the threshing cylinder axis become more and more obvious. This study can provide reference for reducing the unbalanced excitation signal of threshing drum and improving driving comfort.

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“…In the study by Haddad et al [34], the V d and V q voltage values were used for eccentricity diagnosis. Ogidi et al [35] proposed a method based on vibration analysis for the detection of static angular eccentricity. In another study by Ogidi et al [36], static eccentricity and short-circuit faults were separated, using vibration analysis and the stator current spectrum for fault diagnosis.…”

Section: Introductionmentioning

confidence: 99%

The Neutral Voltage Difference Signal as a Means of Investigating Eccentricity and Demagnetization Faults in an AFPM Synchronous Generator

Barmpatza

2023

Machines

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This article investigates the neutral voltage difference signal, VNO signal, for fault diagnosis. The aforementioned signal is the signal of the voltage between the common star point of the stator and the common star point of the load. The under-study faults are demagnetization and static eccentricity faults, while the machine in which the faults are investigated is an axial flux permanent magnet (AFPM) synchronous generator, suitable for wind power applications. This study was conducted using a 3D finite element method (3D-FEM), and the machine’s FEM model was validated through experiments. This method is one of the most accurate methods for electrical machine computation, allowing for a detailed study of electromagnetic behavior. The components that constitute the VNO signal were determined using a 3D-FEM software program (Opera 18R2). Subsequently, further analysis was performed using MATLAB R2022b software, and a fast Fourier transform (FFT) was applied to this signal. In all the investigated faulty cases, new harmonics appeared, and the healthy amplitudes of most of the already existing harmonics increased. These findings can be used for fault identification. The analysis revealed that the harmonic frequency of 1.5fs was the most dominant in the case of demagnetization, while in the case of static eccentricity, the most dominant harmonic was a frequency equal to the machine’s operating frequency, fs. The novelty of this study is that this signal has not previously been used for fault identification, especially in AFPM synchronous machines. This signal depends on EMF voltage and stator phase currents but is less sinusoidal. Consequently, it can detect faults in cases where the aforementioned signals cannot be used for detection.

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Detection of static eccentricity faults in AFPM machine with asymmetric windings using vibration analysis

Cited by 5 publications

References 31 publications

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

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

Effects of Unbalanced Incentives on Threshing Drum Stability during Rice Threshing

The Neutral Voltage Difference Signal as a Means of Investigating Eccentricity and Demagnetization Faults in an AFPM Synchronous Generator

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