The Detection and Suppression of Unbalanced Magnetic Pull in Wound Rotor Induction Motors Using Pole-Specific Search Coils and Auxiliary Windings

Dorrell, David G.; Salah, Ahmad A.; Guo, Youguang

doi:10.1109/tia.2017.2672748

Cited by 25 publications

(6 citation statements)

References 29 publications

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“…The air gap eccentricity of DFIG is a common mechanical fault [5,6]. Both insufficient rotor stiffness and bearing wear will lead to air gap eccentricity failure [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of static/dynamic air‐gap eccentricity on stator and rotor vibration characteristics in doubly‐fed induction generator

Dai

et al. 2022

IET Electric Power Appl

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This article has conducted a comprehensive study on the stator and rotor vibration characteristics of the doubly‐fed induction generator (DFIG) in the case of radial air gap eccentricity (RAGE). Differently from other previous studies, this paper not only investigates the vibration characteristics of stator and rotor in radial static air gap eccentricity (RSAGE) and radial dynamic air‐gap eccentricity (RDAGE) fault but also takes the radial hybrid air gap eccentricity (RHAGE) into account. Through theoretical derivation, the detailed expressions of stator magnetic pull per unit area (MPPUA) and rotor unbalanced magnetic pull (UMP) are obtained. The finite element analysis (FEA) and experiment based on a two pairs of poles DFIG, and the results are consistent with theoretical calculations. It is shown that RAGE will enlarge the magnitude of stator MPPUA/vibration and rotor UMP/vibration. Specifically, RSAGE will not change the frequency components of stator MPPUA/vibration but will bring new frequency components to rotor UMP/vibration. However, both stator MPPUA/vibration and rotor UMP/vibration will generate new frequency components during RDAGE fault. In addition, the effect of RHAGE is the superposition of RSAGE and RDAGE. The research conclusions obtained in this paper can be used as a supplementary criterion for diagnosing the eccentricity of DFIG.

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“…The air gap eccentricity of DFIG is a common mechanical fault [5,6]. Both insufficient rotor stiffness and bearing wear will lead to air gap eccentricity failure [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of static/dynamic air‐gap eccentricity on stator and rotor vibration characteristics in doubly‐fed induction generator

Dai

et al. 2022

IET Electric Power Appl

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“…As the failure worsened, such faults will cause the stator core deformation, winding damage and other accidents [3][4][5]. When the rotor inter-turn short circuit develops to a certain extent, the excitation current will increase significantly, the winding temperature increases, the reactive power decreases, the bearing vibration increases, and even lead to grounding failure, making the rotor magnetized, and the neck and shaft will be burned when severe [6,7]. In view of the serious consequences of these two faults and the high maintenance costs later on, scholars attach great importance to the monitoring and diagnosis of these two faults.…”

Section: Introductionmentioning

confidence: 99%

Stator current identification in generator among single and composite faults composed by static air‐gap eccentricity and rotor inter‐turn short circuit

Qiu

Jiang

et al. 2022

IET Electric Power Appl

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In this study, a fault diagnosis model based on magnetic density is proposed to analyse the current characteristics of synchronous generator rotor inter-turn short circuit and air gap eccentric single fault and composite fault. The model considers the influence of rotor inter-turn short circuit and air gap eccentricity on air gap magnetic density. According to two main factors, the short circuit turns and eccentric distance, are used to reflect the short circuit and eccentricity of the generator. The detailed parameter input model of the generator can easily and quickly predict the development trend of these current parameters based on the air gap magnetic density. And the phase current is selected as the current parameter. The validity of the proposed model is verified by two-dimensional finite element analysis and experimental research.

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“…The occurrence of faults such as the eccentricity of the generator will increase the mechanical stress [6] and thermal stress [19] of the winding, which will aggravate the damage of the winding insulation. The air gap eccentricity fault is a common mechanical fault of generators [20] which is usually divided into static air gap eccentricity (RSAGE), radial dynamic air gap eccentricity (RDAGE) and radial dynamic static hybrid air gap eccentricity (RHAGE) [21].…”

Section: Introductionmentioning

confidence: 99%

Impact of Radial Air-Gap Eccentricity on Stator End Winding Vibration Characteristics in DFIG

Zhang

et al. 2022

Energies

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In this paper, qualitative theoretical derivations, finite element analysis (FEA) and experiments are used to investigate the electromagnetic force (EF) and vibration characteristics of end windings. In contrast to previous studies, this study focuses not only on end winding EF/vibration under normal and radial static air gap eccentricity (RSAGE) conditions, but also for the cases of radial dynamic air gap eccentricity (RDAGE) and radial dynamic static hybrid air gap eccentricity (RHAGE). Firstly, the magnetic flux density (MFD) is derived for normal and radial air gap eccentricity (RAGE) faults, and detailed EF expressions are obtained before and after the RAGE fault. The finite element analysis (FEA) and experimental studies were performed on a four-pole DFIG at a speed of 1500 rpm to verify the proposed theoretical analysis. It is shown that RSAGE only enlarges the EF/end winding vibration and does not introduce new frequency components. RDAGE not only increases EF/end winding vibration but also introduces new frequency components. RHAGE can be seen as a superimposed effect of RSAGE and RDAGE.

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The Detection and Suppression of Unbalanced Magnetic Pull in Wound Rotor Induction Motors Using Pole-Specific Search Coils and Auxiliary Windings

Cited by 25 publications

References 29 publications

Effect of static/dynamic air‐gap eccentricity on stator and rotor vibration characteristics in doubly‐fed induction generator

Effect of static/dynamic air‐gap eccentricity on stator and rotor vibration characteristics in doubly‐fed induction generator

Stator current identification in generator among single and composite faults composed by static air‐gap eccentricity and rotor inter‐turn short circuit

Impact of Radial Air-Gap Eccentricity on Stator End Winding Vibration Characteristics in DFIG

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