Discernment of Broken Magnet and Static Eccentricity Faults in Permanent Magnet Synchronous Motors

Göktaş, Taner; Zafarani, Mohsen; Akin, Bilal

doi:10.1109/tec.2015.2512602

Cited by 115 publications

(47 citation statements)

References 27 publications

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“…As can be seen from formula (8), when the generator rotor shows dynamic eccentricity, even harmonics appear in the air gap magnetic field. Among these, the second harmonic is the most obvious (underline mark in formula (8)), and the second harmonic rotates synchronously with the rotor.…”

Section: The Main Magnetic Field Characteristics Of Dynamic and Statimentioning

confidence: 99%

“…For example, the effects of rotor eccentricity on the electromagnetic torque, flux linkage, electromotive force (EMF), and d axis reactance in permanent magnet motors have been investigated in [4][5][6][7]. The method used to diagnose eccentric faults in permanent magnet motors using the specific frequency harmonic in the stator current was put forward in [8][9][10][11]. For induction motors, it has been proposed that the rotor eccentricity fault can be diagnosed by the stator current and different types of detection coils [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Dynamic and Static Eccentric Faults in Turbo Generator

Cai

et al. 2019

IEEJ Transactions Elec Engng

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Rotor eccentricity is a common fault in turbo generators, but there is currently no effective means of evaluating the eccentric state of the generators. In this article, the air‐gap permeance method was used to analyze the influence of rotor eccentricity on the no‐load main magnetic field, and the installation of U‐type detection coils within the stator core was proposed. Using this method, the dynamic eccentricity level can be measured by detecting the 2nd harmonic amplitude of the coil‐induced voltage, and the static eccentricity level can be measured using the difference in the induced voltages from the U‐type coils. Two dimensional numerical simulation results show that the U‐type detection coil is suitable for the detection of dynamic and static eccentric faults. Therefore, this method can be used for the evaluation of the eccentric state in turbo generators. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Section: The Main Magnetic Field Characteristics Of Dynamic and Statimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Dynamic and Static Eccentric Faults in Turbo Generator

Cai

et al. 2019

IEEJ Transactions Elec Engng

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“…Discernment of broken PM and SE faults in PM synchronous machines using the stator current signature was the subject of Goktas et al Some components of the current spectrum have been presented to discern broken PM and SE faults. However, it will be shown that the proposed component in current signature is not a reliable index for SE fault detection, especially in high pole numbers where PM machines have lower saturation effect.…”

Section: Introductionmentioning

confidence: 99%

A new analytical technique for analysis and detection of air-gap eccentricity fault in surface-mounted permanent-magnet machines

Hassanzadeh

Faiz

Kiyoumarsi

2018

Int Trans Electr Energ Syst

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Summary This paper presents a new analytical technique for modelling the impact of static eccentricity (SE), dynamic eccentricity (DE), and mixed eccentricity (ME) faults on electromotive force (EMF) or Back‐EMF, output voltages and currents of surface‐mounted permanent‐magnet (SMPM) machines. This model is based on the combination of the complex relative permeance and the eccentricity relative air‐gap permeance. It presents explicit formulas for no‐load and on‐load, field distribution, magnetic flux, EMF/Back‐EMF, and output voltages and currents of SMPM for different types of eccentricity fault. Furthermore, a new eccentricity model is presented and applied, which can cover more eccentricity fault types; some of them have not been so far considered in the literatures. Analytical results are validated by time‐stepping finite element method results. The analytical and numerical results refer to the fact that the SE does not cause any new frequency component in the EMF/Back‐EMF and currents spectra. However, the same is true in the case of DE and ME faults where some frequency components appear in the EMF/Back‐EMF and currents spectra, not only around the fundamental harmonic but also around some other harmonics.

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“…Electrical and mechanical faults or imperfections that produce rotating asymmetries in the motor or load can also be detected with motor current signature analysis (MCSA) by monitoring the ffault component in the current spectrum. In [2]- [3], [7]- [9], it is shown that motor (rotor eccentricity, local PM demagnetization), coupling (gear/belt pulley faults), and load (load unbalance, misalignment, etc) defects can be detected with MCSA. Most of the recent studies focus on MCSA since it can provide remote, online monitoring with current measurements already available in the drive.…”

mentioning

confidence: 99%

“…Most of the recent studies focus on MCSA since it can provide remote, online monitoring with current measurements already available in the drive. Despite the advantages, it was shown in [7]- [8] that the detectability of the fault depends on the winding configuration and motor topology. One of the main limitations of MCSA comes from the fact that all rotating asymmetries that produce a once per revolution component, fr, induce identical ffault sideband frequency components in the current, and there is no practical means of separating them [2].…”

mentioning

confidence: 99%

Online Detection and Classification of Rotor and Load Defects in PMSMs Based on Hall Sensor Measurements

Park

Yang

Lee

et al. 2019

IEEE Trans. on Ind. Applicat.

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On-line monitoring and diagnostics of permanent magnet synchronous motors (PMSM) is becoming important with the increasing demand in PMSM applications. Most of the research effort focuses on motor current signature analysis (MCSA) as it can provide remote, on-line monitoring at low cost. However, all types of defects that produce asymmetries in the PMSM rotor or load produce identical rotor rotational frequency components. This is a serious limitation when applying MCSA since it can produce false indications and degrade the sensitivity of fault detection. In this paper, the feasibility of using analog Hall sensors signals to complement MCSA for detection and classification of rotor and load related defects is investigated. It is shown that Hall sensors installed in machines for initial rotor position estimation can be used with minimal hardware modifications, to detect and classify signatures produced by the rotor and load, for cases where MCSA fails. Experimental testing performed on an IPMSM under eccentricity, local demagnetization, and load unbalance conditions show that the reliability and sensitivity of fault detection in PMSM systems can be improved at low added cost.

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Discernment of Broken Magnet and Static Eccentricity Faults in Permanent Magnet Synchronous Motors

Cited by 115 publications

References 27 publications

Evaluation of Dynamic and Static Eccentric Faults in Turbo Generator

Evaluation of Dynamic and Static Eccentric Faults in Turbo Generator

A new analytical technique for analysis and detection of air-gap eccentricity fault in surface-mounted permanent-magnet machines

Online Detection and Classification of Rotor and Load Defects in PMSMs Based on Hall Sensor Measurements

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