Monitoring and damping unbalanced magnetic pull due to eccentricity fault in induction machines: A review

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

doi:10.1109/icems.2017.8055965

Cited by 8 publications

(10 citation statements)

References 37 publications

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“…Currently the equalizing winding, damping winding, parallel circuit, magnetic saturation and slot/pole combination are mainly adopted in the electromagnetic vibration suppression. The parallel circuit and damping winding methods are the effective approaches that have been extensively investigated [27].…”

Section: Measures To Reduce Electromagnetic Vibrationmentioning

confidence: 99%

“…Khan et al [21] presented a multilevel design optimization framework to improve the efficiency of the proposed method by combining it with several techniques, such as design of experiments and approximate models.The electromagnetic vibration of electrical machines has always been a hot topic in the mechanical discipline and electrical discipline fields, and there exist rich research results. The existing reviews Energies 2018, 11, 1779 3 of 33 of electromagnetic vibration are basically summarized from the view of fault diagnosis [22][23][24][25][26][27], and summaries from the perspective of dynamics are rather insufficient. With the continuous progress of research, some new technologies and methods are emerging.…”

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confidence: 99%

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Review of Electromagnetic Vibration in Electrical Machines

Han

Chu

2018

Energies

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Electrical machines are important devices that convert electric energy into mechanical work and are widely used in industry and people's life. Undesired vibrations are harmful to their safe operation. Reviews from the viewpoint of fault diagnosis have been conducted, while summaries from the perspective of dynamics is rare. This review provides systematic research outlines of this field, which can help a majority of scholars grasp the ongoing progress and conduct further investigations. This review mainly generalizes publications in the past decades about the dynamics and vibration of electrical machines. First the sources of electromagnetic vibration in electrical machines are presented, which include mechanical and electromagnetic factors. Different types of air gap eccentricity are introduced and modeled. The analytical methods and numerical methods for calculating the electromagnetic force are summarized and explained in detail. The exact subdomain analysis, magnetic equivalent circuit, Maxwell stress tensor, winding function approach, conformal mapping method, virtual work principle and finite element analysis are presented. The effects of magnetic saturation, slot and pole combination and load are discussed. Then typical characteristics of electromagnetic vibration are illustrated. Finally, the experimental studies are summarized and the authors give their thoughts about the research trends.Energies 2018, 11, 1779 2 of 33 vibration mechanism can be helpful for the design of electrical machines. Therefore, the study of the electromagnetic vibration of electrical machines has practical significance.Electromagnetic vibrations are usually generated by the distorted air-gap field of an eccentric rotor in electrical machines. The uneven air-gap is directly related to the eccentricity, which is common in rotating electrical machines. Eccentricity can be caused by several reasons, such as relative misalignment of the rotor and stator in the fixing stage, misalignment of the load axis and rotor shaft, elliptical stator inner cross section, wrong placement or rubbing of ball bearings, mechanical resonance, and unbalanced loads [1,2]. Eccentricities can be further subdivided into two categories: circumferential unequal air gaps and axial unequal air gaps. The former can be grouped into static eccentricity and dynamic eccentricity. In the case of static eccentricity, the rotor rotates around its own geometric axis, which is not the geometric axis of the stator. In the case of dynamic eccentricity, the rotor is not concentric and rotates around the geometric axis of the stator. In reality, both static eccentricity and dynamic eccentricity tend to coexist. An inherent static eccentricity exists, even in newly manufactured machines, due to the build-up of tolerances during the manufacturing and assembly procedure, as has been reported in [3]. Unequal air gaps cause unbalanced magnetic forces (UMFs) [4] on the rotor, which lead to mechanical stress on some part of the shaft and bearing. After prolonged operation, these fac...

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Section: Measures To Reduce Electromagnetic Vibrationmentioning

confidence: 99%

mentioning

confidence: 99%

Review of Electromagnetic Vibration in Electrical Machines

Han

Chu

2018

Energies

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“…Assume that the stator and rotor currents densities are J s (y,t) and J r (y,t) respectively. The developed torque is given by (3).…”

Section:  mentioning

confidence: 99%

“…If the electromagnetic behavior could be predicted very accurately, this will help to adjust the manufacturing process in order to obtain higher efficiency and reliability of induction machines, especially for those operating under formidable environment conditions. In addition, analyzing the electromagnetic circuit of the induction machine is necessary to identify faults, because the faults produce one or more indicative signs in most cases, such as increased losses, torque pulsation, and unbalanced air-gap voltages and line currents [3].…”

Section: Introductionmentioning

confidence: 99%

Predicting the behavior of induction machine using motor-CAD and MATLAB packages

Salah

Guo

Dorrell

2018

2018 IEEE 12th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG 2018)

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Optimization design method of induction machines is developed by using Computer-Aided Design and these machines are the most suitable choice for various and complex industrial applications. For instance, the wound rotor induction machines have enjoyed a renascence as the generator in many commercial wind turbines. In this paper, both Motor-CAD and MATLAB packages are employed to predict the electromagnetic behavior of the induction machine during steady-state and transient-state. Finite element analysis of a three-phase, four-pole induction machine is carried by using Motor-CAD and MATLAB in order to complete the comparison. The graphical interfaces of Motor-CAD environment will be utilized to describe the machine geometry, winding harmonics, material properties, and air-gap flux. The predicted results are validated by the experiment. Power losses are calculated for the test machine, and then the results will be explained.

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“…Therefore, the authors proposed a method to further reduce the UMP through rotor slip control by using the non-linear characteristic of UMP over rotor slip [14]. UMP calculation can be categorised into numerical and analytical methods [15]. Numerical methods have better accuracy then analytical methods in calculating the UMP of SCIMs because analytical methods cannot calculate the effect from circulating currents.…”

Section: Introductionmentioning

confidence: 99%

Calculation of unbalanced magnetic pull in induction machines through empirical method

Chuan

Shek

2018

IET Electric Power Applications

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Unbalanced Magnetic Pull (UMP) is an important factor to study to improve the reliability of induction machines. UMP occurred in a machine when the existence of rotor eccentricity which causes an uneven distribution of magnetic flux in the airgap. In this study, a UMP damping coefficient is introduced to explain the UMP damping effect from the counteracting flux produced by a parallel connected cage rotor. An empirical method is proposed to calculate the UMP using the damping coefficient and an analytical model. Using the proposed method, a 4-pole and 8-pole squirrel cage induction machine with static eccentricity are investigated, which uses inputs from both Finite Element Analysis and experimental work. Then, the UMP calculation for a dynamic eccentricity with the extracted parameters is done to verify the empirical method. A slip control method is described which uses a UMP/Torque ratio to find the operating slip with the lowest UMP. Comparisons between results with and without slip control are made on both induction machines. It shows that great reduction of UMP can be achieved when the machine is lightly loaded.

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Monitoring and damping unbalanced magnetic pull due to eccentricity fault in induction machines: A review

Cited by 8 publications

References 37 publications

Review of Electromagnetic Vibration in Electrical Machines

Review of Electromagnetic Vibration in Electrical Machines

Predicting the behavior of induction machine using motor-CAD and MATLAB packages

Calculation of unbalanced magnetic pull in induction machines through empirical method

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