A Stator Core Quality Assessment Technique for Inverter-Fed Induction Machines

Lee, Kwanghwan; Hong, Jongman; Lee, Kwang-Woon; Lee, Sang Bin; Wiedenbrug, E.

doi:10.1109/08ias.2008.21

Cited by 14 publications

(19 citation statements)

References 5 publications

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“…M AGNETIC cores of electrical machines are constructed from laminations of magnetic steel core material alloyed with silicon to minimize the hysteresis and eddy current losses for high-efficiency operation [1]. Since the magnetic cores are exposed to time-varying magnetic fields, eddy currents are induced in the laminations and consequently, energy is converted into heat in the resistance of the eddy current path.…”

Section: Introductionmentioning

confidence: 99%

“…If the generated heat cannot be dissipated adequately, it can cause more interlaminar failures and may eventually cause burning or melting of the iron core and, thus, it raises the potential of a complete machine failure [10]- [17]. Localized heating due to the interlaminar fault currents can also damage the excitation winding insulation and lead to ground failure [1]. Two examples of core melting caused by interlaminar insulation failure are shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Two examples of core melting caused by interlaminar insulation failure are shown in Fig. 2 [1], [10].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Eddy Current Loss Estimation of Edge Burr-Affected Magnetic Laminations Based on Equivalent Electrical Network—Part I: Fundamental Concepts and FEM Modeling

Hamzehbahmani

Anderson

Hall

et al. 2014

IEEE Trans. Power Delivery

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Cutting and punching of the electrical steel can cause edge burrs which lead to interlaminar short circuits between the laminations. In this paper, based on an equivalent electric circuit of the eddy current path, an analytical method has been developed to estimate the eddy current power loss of the magnetic cores, caused by the interlaminar faults, in a wide range of flux density and magnetizing frequency. Important factors, such as skin effect, nonuniform flux density distribution, complex relative permeability, and the nonlinear relation of , which are often neglected in the literature, are highlighted. Fundamental concepts of the interlaminar fault and its consequences, the effect of interlaminar faults on the configuration of magnetic cores, and finite-element method verification are presented in this Part I paper. Modeling of eddy current, together with experimental results of eddy current measurements of packs of shorted laminations, are reported in Part II. Index Terms-Complex relative permeability, eddy current power loss, edge burr, finite-element method (FEM) modeling, high frequencies, interlaminar fault, skin effect.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Eddy Current Loss Estimation of Edge Burr-Affected Magnetic Laminations Based on Equivalent Electrical Network—Part I: Fundamental Concepts and FEM Modeling

Hamzehbahmani

Anderson

Hall

et al. 2014

IEEE Trans. Power Delivery

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“…The magnetic core is a key component of electrical machines such as power transformers [1][2][3][4], rotating electrical machines [5,6], LCL filters for inverters and variable speed drives [7], peak current limiters [8], switching converters [9], variable inductors [10], etc. The time varying magnetic fields induce eddy currents in the core, and consequently some energy is converted into heat [11].…”

Section: Introductionmentioning

confidence: 99%

Lamination effects on a 3D model of the magnetic core of power transformers

et al. 2017

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Abstract:In this paper the lamination effect on the model of a power transformer's core with stacked E-I structure is analyzed. The distribution of the magnetic flux in the laminations depends on the stacking method. In this work it is shown, using a 3D FEM model and an experimental prototype, that the non-uniform distribution of the flux in a laminated E-I core with alternate-lap joint stack increases substantially the average value of the magnetic flux density in the core, compared with a butt joint stack. Both the simulated model and the experimental tests show that the presence of constructive air-gaps in the E-I junctions gives rise to a zig-zag flux in the depth direction. This interlamination flux reduces the magnetic flux density in the Ipieces and increases substantially the magnetic flux density in the E-pieces, with highly saturated points that traditional 2D analysis cannot reproduce. The relation between the number of laminations included in the model, and the computational resourses needed to build it, is also evaluated in this work.

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“…No artigo de Lee et al (2010) é proposto um método de monitoramento da qualidade do núcleo do estator para máquinas alimentadas por inversores de frequência. O conceito principal consiste em utilizar o inversor para aplicar um conjunto de sinais de teste para avaliar a qualidade do núcleo por intermédio da aplicação de um campo magnético pulsante de alta-frequência.…”

Section: Falhas De Estatorunclassified

Multiclassificador inteligente de falhas no domínio do tempo em motores de indução trifásicos alimentados por inversores de frequência

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A Stator Core Quality Assessment Technique for Inverter-Fed Induction Machines

Cited by 14 publications

References 5 publications

Eddy Current Loss Estimation of Edge Burr-Affected Magnetic Laminations Based on Equivalent Electrical Network—Part I: Fundamental Concepts and FEM Modeling

Eddy Current Loss Estimation of Edge Burr-Affected Magnetic Laminations Based on Equivalent Electrical Network—Part I: Fundamental Concepts and FEM Modeling

Lamination effects on a 3D model of the magnetic core of power transformers

Multiclassificador inteligente de falhas no domínio do tempo em motores de indução trifásicos alimentados por inversores de frequência

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