Effects of stresses on magnetic properties of silicon-iron laminations

Moses, Anthony John

doi:10.1007/bf00550944

Cited by 29 publications

(7 citation statements)

References 11 publications

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“…9,27,33,37,38,40,43) This aspect is non-trivial: the core loss or iron loss, during electricity generation itself, was estimated, 9) in 1990, at 400 billion kWh. Degradation in the magnetic properties in a transformer core remains a real challenge to the technological society.…”

Section: Discussionmentioning

confidence: 99%

“…64) Presence of stress results in stress anisotropy, which causes a change in the magnetic behavior of the material because of its effect on the domain wall motion and the domain rotation. 4,33,35,42) Therefore, in such materials, the magnetic softness and hence the permeability decreases considerably. In RD-45 and RD-90 samples, the variation with stress is not systematic as the zero strain values themselves are not as high as in the case of RD-0.…”

Section: Discussionmentioning

confidence: 99%

“…9,19,21,[25][26][27][28][29][30][31][32] These, in turn, may affect the magnetic properties. 18,19,22,23,27,[33][34][35][36][37][38][39][40][41][42][43][44] To a transformer manufacturer and end-user, hysteresis loss and permeability are the two important properties. It has been reported 4,33,37,39,40,43) that tensile residual stresses can even be beneficial: depending on the specimen orientation and the magnitude of such stresses; 37,40,43) while compressive stresses are detrimental for hysteresis loss in a typical CRGO lamination.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic Properties in Deformed Grain Oriented Electrical Steel: On the Role of Strain Hardening Exponent and Microstructural Developments

Shekhawat

Vadavadagi

Hiwarkar³

et al. 2012

ISIJ Int.

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High permeability commercial CRGO, cold rolled grain oriented steel was subjected to uni-axial tensile strain in three principal orientations: (110) <001>, (110) < 10> and (110)< 11>. The samples exhibited remarkably different stress-strain behavior. The numerical values of the strain hardening exponent, n, largely determined the degradation in magnetic properties: namely increase in Hysteresis loss (H) and drop in Permeability (μ). Changes in magnetic properties were also correlated with microstructural observations: misorientation and dislocation density developments, relative recovery, residual strain and deviation from ideal <001>. The study established constitutive relationships between degradation in magnetic properties and various parameters of the deformed microstructures.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic Properties in Deformed Grain Oriented Electrical Steel: On the Role of Strain Hardening Exponent and Microstructural Developments

Shekhawat

Vadavadagi

Hiwarkar³

et al. 2012

ISIJ Int.

View full text Add to dashboard Cite

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“…The deformation and deviation in the BH-loop of an electrical steel sheet due to stress are evident from various previous studies [1]- [3]. These effects of stress on the material properties, especially on the BH characteristic [4], [5], the iron losses [3], [6], [7] and the vibration [8], [9], are detrimental for an electrical machine [10]- [12]. In order to accound for these effects, a comprehensive magnetic and mechanics coupled (i.e.…”

Section: Introductionmentioning

confidence: 96%

Magnetomechanical Model for Hysteresis in Electrical Steel Sheet

et al. 2016

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A coupled magneto-mechanical model for hysteresis in an electrical steel sheet is presented. The foundation of the model developed is the classical Sablik-Jiles-Atherton (SJA) model. A comprehensive model for the stress dependent magnetostriction is also proposed and implemented in the SJA model. Improvements in the SJA model as well, are proposed and validated with simultaneous measurements of magnetostriction, magnetic field and flux density. The measurements were performed on a single electrical steel sheet under various levels of stress (-35 MPa to 100 MPa). The proposed model was found to adequately model the permeability change and the local bowing of the BH-loop due to stress.

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“…With clamping looseness, the internal stress of the silicon steel laminations is reduced as well, which leads to a weaker magneto-mechanical coupling and thus results in a smaller magnetostriction. 15,16 This is another factor influencing the electrically excited FRFs, as core clamping looseness will decrease the magnetostriction. Combined with the above factors, the synthetic effect is to increase the electrically excited FRFs due to core looseness in this study.…”

Section: Vibration Changes Due To Core Loosenessmentioning

confidence: 99%

Changes to the Vibration Response of a Model Power Transformer with Faults

Yuxing¹

2016

IJAV

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Current vibration-based techniques for transformer condition monitoring mostly rely on the vibration response caused by operating excitations, which consist of electrical excitations from the core and winding. Therefore, it is worthwhile to study the electrically-excited frequency response function (FRF), as it carries information of transformer mechanical and electromagnetic properties. This paper includes a sensitivity analysis of the mechanically and electrically excited FRFs of a model transformer to the reasons behind its failures. A model power transformer is used as an example to demonstrate the variation of its vibration response to a couple of causes of transformer faults, such as looseness of clamping forces in winding and core. Experimental evidence is presented to show the quantitative description of the causes of artificial faults and to extract features of variations of FRFs that might be useful to the vibration-based detection of the causes of transformer faults in general.

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Effects of stresses on magnetic properties of silicon-iron laminations

Cited by 29 publications

References 11 publications

Magnetic Properties in Deformed Grain Oriented Electrical Steel: On the Role of Strain Hardening Exponent and Microstructural Developments

Magnetic Properties in Deformed Grain Oriented Electrical Steel: On the Role of Strain Hardening Exponent and Microstructural Developments

Magnetomechanical Model for Hysteresis in Electrical Steel Sheet

Changes to the Vibration Response of a Model Power Transformer with Faults

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