Modeling and analysis of cage induction motors under rotor misalignment and air gap eccentricity

Kelk, Homayoun Meshgin; Eghbali, Amir; Toliyat, H.A.

doi:10.1109/ias.2005.1518531

Cited by 18 publications

(3 citation statements)

References 5 publications

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“…In machines with magnetic bearings [19] or bearingless machines [20] the force can be calculated using the currents in the levitation system. Load cells have been used [21] although they do move when loaded which needs to be taken into account. A more successful mechanical method is to use piezoelectric force cells.…”

Section: The Measurement and Indexing Of Unbalanced Magnetic Pull In mentioning

confidence: 99%

The Development of an Indexing Method for the Comparison of Unbalanced Magnetic Pull in Electrical Machines

Dorrell

Shek

Hsieh

2016

IEEE Trans. on Ind. Applicat.

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Section: The Measurement and Indexing Of Unbalanced Magnetic Pull In mentioning

confidence: 99%

The Development of an Indexing Method for the Comparison of Unbalanced Magnetic Pull in Electrical Machines

Dorrell

Shek

Hsieh

2016

IEEE Trans. on Ind. Applicat.

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“…It showed that inclined eccentricity symmetric to the midpoint of the machine shaft could not be recognized from the current spectrum and would therefore require some other form of detection. Other kinds of axial-varying eccentricity mentioned in some papers are similar to the inclined eccentricity, such as simultaneous static air gap eccentricity and rotor misalignment fault studied in [11] and [12], eccentricity at one end only mentioned in [13].…”

Section: Introductionmentioning

confidence: 99%

Inductances Evaluation of a Squirrel-Cage Induction Motor with Curved Dynamic Eccentricity

Lv¹,

Bao²,

He³

et al. 2014

Journal of Electrical Engineering and Technology

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-Eccentricity faults more or less exist in all rotating electrical machines. This paper establishes a more precise model of dynamic eccentricity (DE) in electrical machines named as curved dynamic eccentricity. It is a kind of axial unequal eccentricity which has not been investigated in detail so far but occurs in large electrical machines. The inductances of a large three-phase squirrel-cage induction machine (SCIM) under different levels of curved DE conditions are evaluated using winding function approach (WFA). These inductances include the stator self and mutual inductances, rotor self and mutual inductances, and mutual inductances between stator phases and rotor loops. A comparison is made between the calculation results under curved DE and the corresponding pure DE conditions. It indicates that the eccentricity condition will be more terrible than the monitored eccentricity based on the conventional pure DE model.

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“…Noise and vibration monitoring is another monitoring techniques as most of motor faults lead to vibration of the machines. Accelerometer is able to pick up vibration of the machines and hence fault detection is done by spectrum analysis [54], [55]. However vibration monitoring reduces in popularity as installation of sensors are troublesome and not cost effective as well.…”

Section: Other Monitoring Techniquesmentioning

confidence: 99%

Transduction matrix of AC motor driven mechanical systems : system modelling and fault diagnosis

Lian¹

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In this dissertation, a modelling technique for motor driven system based on transduction matrix is introduced. Transduction matrix describes the relationship between input and output of a system in frequency domain, thus it provides better understanding of the system's condition. For a motor driven system running at constant frequency, the transduction matrices for induction motor, power transmission system and mechanical loading can be obtained from respective governing equations. Since transduction matrix represents the system's properties, condition monitoring can be attained by studying these transduction functions. In addition, transduction matrix facilitates the analysis on both impedance propagation and power flow in the motor driven system.Consequently, the electrical input impedance that consists of transduction function is utilized in condition monitoring of induction motor. Studying the frequency components of electrical input impedance allows characteristic frequencies of motor faults to be identified. Therefore, the proposed monitoring signature is used to monitor the change of signature due to broken rotor bar, abnormal air-gap eccentricity and bearing faults. By comparing with the results from conventional monitoring technique, impedance signature proved to have better sensitivity as fault signature is amplified. Furthermore, wavelet packet transform is utilized in order to carry out fault detection in time-frequency analysis, where the signal to noise ratio is improved and make the fault detection easier.

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Modeling and analysis of cage induction motors under rotor misalignment and air gap eccentricity

Cited by 18 publications

References 5 publications

The Development of an Indexing Method for the Comparison of Unbalanced Magnetic Pull in Electrical Machines

The Development of an Indexing Method for the Comparison of Unbalanced Magnetic Pull in Electrical Machines

Inductances Evaluation of a Squirrel-Cage Induction Motor with Curved Dynamic Eccentricity

Transduction matrix of AC motor driven mechanical systems : system modelling and fault diagnosis

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