Dynamic simulation of dynamic eccentricity in induction machines-winding function approach

Joksimović, Gojko; Durovic, M.D.; Penman, J.; Arthur, N.

doi:10.1109/60.866991

Cited by 140 publications

(104 citation statements)

References 12 publications

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“…Different eccentricities in induction machines were documented previously [7,8,[13][14][15][16][17][18]. In reality, the most probable case is the inclined air gap eccentricity or rotor misalignment fault.…”

Section: Introductionmentioning

confidence: 87%

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A Modified Model of Squirrel Cage Induction Machine Under General Rotor Misalignment Fault

Akbari¹

2013

PIER B

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Abstract-A great deal of researches have so far been conducted on the analysis of eccentricity in induction machines. However, they mostly consider radial non-uniformity and neglect non-uniformity in the axial direction, but in practice, the axial non-uniformity due to rotor misalignment faults is quite common. This paper presents a modified model of a three-phase squirrel cage induction machine under different rotor misalignment conditions. For this purpose, general expressions for air gap and mean radius of induction machine, considering axial non-uniformity, have been developed. The proposed model is able to calculate the time varying inductances versus rotor angle for three-phase squirrel cage induction machines under general rotor misalignment, including static, dynamic and mixed rotor misalignment in the frame of a single program. Simulation results were verified by the experimental ones.

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Section: Introductionmentioning

confidence: 87%

“…Mean radius function depends on the geometry of the air gap. In many studies, this function has been considered to be constant [7,8,[13][14][15][16][17][18][19][20][21][22]. Fig.…”

Section: Mixed Misalignment Modelingmentioning

confidence: 99%

A Modified Model of Squirrel Cage Induction Machine Under General Rotor Misalignment Fault

Akbari¹

2013

PIER B

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“…Eccentricity fault in induction motors is widely investigated [14][15][16][17][18][19][20], but a very few papers deals with such faults in synchronous generators. Hence, study of the generator performance under this fault seems to be necessary.…”

Section: Introductionmentioning

confidence: 99%

Time-Stepping Finite-Element Analysis of Dynamic Eccentricity Fault in a Three-Phase Salient Pole Synchronous Generator

Faiz¹,

Babaei²,

Nazarzadeh³

et al. 2010

PIER B

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Abstract-In this paper, two-dimensional time-stepping finiteelement (TSFE) method is performed for modeling and analyzing of a salient pole synchronous generator with different degree of dynamic eccentricity (DE) fault. TSFE analysis is used to describe the influence of DE fault on the flux distribution within the generator and no-load voltage profiles at low and high field current is obtained for healthy and faulty cases. Comparing the magnetic flux distribution of healthy and faulty generators helps to detect the influence of DE fault. Also, it can be seen at no-load condition with low excitation current, the effect of the eccentricity is considerable compared to that of the rated excitation current. Since the calculation of inductances of the machine is the most important step for fault analysis and diagnosis, the self-and mutualinductances of the stator phases and rotor windings are calculated in the eccentric generator. Double periodic phenomenon is observed in inductances profile of stator phases due to the DE fault. Finally, spectrum analysis of stator current of two generators with different design parameters is used to diagnosis the significant harmonics in the presence of DE fault.

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“…In this case, air-gap distribution is not uniform, and the position of minimum air-gap rotates with the rotor. Generally speaking, there are manifold causes of dynamic eccentricity, such as manufacture tolerances, wear of bearings and incorrect manufacture of the machine components mentioned in [2]. And [3] lists three causes of air-gap eccentricity: 1) manufacturing/installation defect, 2) incorrect positioning of rotor and stator, bent rotor shaft, 3) bearing misalignment, wear, improper lubrication.…”

Section: Introductionmentioning

confidence: 99%

Influence of Thermal Expansion on Eccentricity and Critical Speed in Dry Submersible Induction Motors

Lv¹,

Bao²,

He³

2014

Journal of Electrical Engineering and Technology

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-Rotor eccentricity is one of the major factors that directly influence the security of horizontal electrical machines, and the critical speed of the shaft has a close relationship with vibration. This paper deals with the influence of thermal expansion on the rotor eccentricity and critical speed in large dry submersible motors. The dynamic eccentricity (where the rotor is still turning around the stator bore centre but not its own centre) and critical speed of a three-phase squirrelcage submersible induction motor are calculated via hybrid analytical/finite element method. Then the influence of thermal expansion is investigated by simulation. It is predicted from the study that the thermal expansion of the rotor and stator gives rise to a significant air-gap length decrement and an inconspicuous slower critical speed. The results show that the thermal expansion should be considered as an impact factor when designing the air gap length.

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Dynamic simulation of dynamic eccentricity in induction machines-winding function approach

Cited by 140 publications

References 12 publications

A Modified Model of Squirrel Cage Induction Machine Under General Rotor Misalignment Fault

A Modified Model of Squirrel Cage Induction Machine Under General Rotor Misalignment Fault

Time-Stepping Finite-Element Analysis of Dynamic Eccentricity Fault in a Three-Phase Salient Pole Synchronous Generator

Influence of Thermal Expansion on Eccentricity and Critical Speed in Dry Submersible Induction Motors

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