Main inductances of induction motor for diagnostically specialized mathematical models

Węgiel, T.; Weinreb, Konrad; Sułowicz, Maciej

doi:10.2478/s10171-010-0004-1

Cited by 9 publications

(16 citation statements)

References 17 publications

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“…Such a function depends on the angular coordinate of the stator and the angle of rotation of the rotor. In publications [26,27], various forms of the permeance function depending on the type of eccentricity were presented. This chapter mainly focuses on the prac-tical aspects of identifying types of eccentricity and their negative impact on the design of the machine.…”

Section: Types Of Eccentricity and Assessment Indicators As Comparati...mentioning

confidence: 99%

Eccentricity in Induction Machines—A Useful Tool for Assessing Its Level

2021

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In the condition monitoring of induction machines operating in various industry sectors, the assessment of eccentricity is as important as the assessment of the condition of windings, bearings, mechanical vibrations or noise. The reasons for the eccentricity can be various; for example, rotor imbalance, damage or wear of the bearings, improper alignment of the rotor and the load machine and finally, assembly errors after overhaul. Disregard of this phenomenon during routine tests may result in the development of vibrations transmitted to the stator windings, faster wear of the bearings and even, in extreme cases, rubbing of the rotor against the stator surface and damage to the windings and local overheating of the machine core. On the basis of years of experience in the diagnosis of large induction machines operating in various industries, the article deals with the problem of developing reliable indicators for assessing the levels of commonly accepted types of eccentricity. Starting from field calculations and analyzing various cases of eccentricity, the methodology for determining the indicators for evaluation from the stator current spectrum is shown. The changes in the values of these indices for various cases of simultaneous occurrence of static and dynamic eccentricity are shown. The calculation results were verified in the laboratory. Also shown are three interesting cases from diagnostic practice in the evaluation of high-power machines in the industry. It has been shown that the proposed indicators are useful and enable an accurate diagnosis of levels of eccentricity.

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Section: Types Of Eccentricity and Assessment Indicators As Comparati...mentioning

confidence: 99%

Eccentricity in Induction Machines—A Useful Tool for Assessing Its Level

2021

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“…One can distinguish three types of eccentricity: static, dynamic, and mixed. The per-unit function that models this phenomenon can be derived based on geometrical dependencies and is written in the form of a Fourier series [43]:…”

Section: Inductance Modelmentioning

confidence: 99%

Induction Motor Fault Diagnosis Based on Zero-Sequence Current Analysis

Duda

Drozdowski

2020

Energies

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This paper presents some considerations regarding the application of the stator zero-sequence current component (ZSC) in the fault detection of cage induction machines, including the effects of magnetic core saturation. Faults such as rotor cage asymmetry and static, dynamic, and mixed eccentricity were considered. The research started by developing a harmonic motor model, which allowed us to obtain a voltage equation for the zero-sequence current component. The equation allowed us to extract formulas of typical frequencies for particular fault types. Next, in order to verify the effectiveness of ZSC in induction motor fault diagnosis, finite element calculations and laboratory tests were carried out for the previously mentioned faults for delta and wye connections with neutral wire stator winding configurations.

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“…Under mentioned above assumptions only the matrices 2 A and ) (i A 4 appear in the formulas (4), (5) and they have the following forms: those coefficients have to fulfil the equations: (10) or in the abbreviated form .…”

Section: Description Of Algorithm Based On Co-energy and Flux Linkagementioning

confidence: 99%

“…Accurate field method was described in [5]. The simplified method based on the distribution of magnetic field density in an air gap of an electric machine was mentioned in [10]. The indirect but more simple method based on the magnetic co-energy function used the set of functions approximating linked fluxes of windings was proposed in [4].…”

Section: Introductionmentioning

confidence: 99%

Estimation of coefficients of multivariable power series approximating magnetic nonlinearity of AC machines

Sobczyk¹,

Warzecha²

2015

Archives of Electrical Engineering

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Abstract:Energy based approach was used in the study to formulate a set of functions approximating the magnetic flux linkages versus independent currents. The simplest power series that approximates field co-energy and linked fluxes for a two winding core of an induction machine are described by a set of common unknown coefficients. The authors tested three algorithms for the coefficient estimation using Weighted Least-Squared Method for two different positions of the coils. The comparison of the approximation accuracy was accomplished in the specified area of the currents. All proposed algorithms of the coefficient estimation have been found to be effective. The algorithm based solely on the magnetic field co-energy values is significantly simpler than the method based on the magnetic flux linkages estimation concept. The algorithm based on the field coenergy and linked fluxes seems to be the most suitable for determining simultaneously the coefficients of power series approximating linked fluxes and field co-energy.

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Main inductances of induction motor for diagnostically specialized mathematical models

Cited by 9 publications

References 17 publications

Eccentricity in Induction Machines—A Useful Tool for Assessing Its Level

Eccentricity in Induction Machines—A Useful Tool for Assessing Its Level

Induction Motor Fault Diagnosis Based on Zero-Sequence Current Analysis

Estimation of coefficients of multivariable power series approximating magnetic nonlinearity of AC machines

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