Consequences of magnetic aging for iron losses in electrical steels

Campos, Marcos Flávio de; Emura, M.; Landgraf, Fernando José Gomes

doi:10.1016/j.jmmm.2006.02.185

Cited by 27 publications

(25 citation statements)

References 15 publications

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“…The main cause of carbide precipitation on non-oriented electrical steel is the increasing energy relative to hysteresis loss (W h ) 2 . This effect is a consequence of domain wall pinning by iron carbides during the hysteresis process.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Aging, Anomalous and Hysteresis Losses

Almeida

Landgraf

2019

Mat. Res.

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In this study the magnetic aging effect on anomalous and hysteresis loss was investigated, as well as its effect on domain morphology. For this purpose, non-oriented fully processed electrical steel with 2.3 wt.%Si-79 ppm C and non-oriented semi-processed electrical steel annealed at 750 °C for 5 hours with 0.4 wt.%Si-340 ppm C were aged at 150 °C. The anomalous loss has been shown to be less affected by the magnetic aging. The increasing of the excitation frequency has induced a reduction on anomalous loss measured on aged steel. All increases presented by total loss were provided by hysteresis loss. The main disturbance in magnetic domain morphology appears to have been caused by different grain orientation.

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Section: Introductionmentioning

confidence: 99%

Magnetic Aging, Anomalous and Hysteresis Losses

Almeida

Landgraf

2019

Mat. Res.

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“…This dissipated energy due to magnetic loss has a hysteretic component that is much sensitive to the presence of these precipitates. The remaining two portions of the magnetic losses, namely the anomalous loss and the Foucault loss, are less influenced by the precipitation 1,4 . The size, morphology, and distribution of the carbide phases depend on magnetic ageing temperature and the carbon content of the steel.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Magnetic Ageing of 2%Si Non-oriented Grain Electrical Steel

Júnior¹,

Monteiro

Paolinelli³

et al. 2017

Mat. Res.

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The effect of carbon content on the magnetic ageing index and Vickers hardness evolution on annealed samples of 2%Si non-oriented grain electrical steel was studied. Samples with 40 and 60ppm carbon content were subjected at ageing temperatures of 200 and 225ºC, respectively. During the ageing treatment, the cycle was interrupted on several time intervals in order to obtain the core loss and to determine Vickers hardness. The precipitates were characterized using scanning electron microscope (SEM). Using the software MatCalc, computer simulations of ε-carbide precipitation were performed and compared with experimental data from literature. The results for both carbon contents showed that the maximum hardness value was achieved in shorter time than that to achieve the maximum magnetic ageing, indicating that the critical size of precipitates more harmful to the magnetic properties is larger than the ones that maximize the hardness.

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“…Particularly, precipitates whose size is close to the domain walls thickness, have the strongest effect [5], [7]. As a result, the coercive force and the hysteresis losses increase [3], [4], [8].…”

Section: Introductionmentioning

confidence: 99%

Magnetic ageing investigation of bulk low-carbon silicon steel

Jamil

Bénabou

Clénet

et al. 2021

Journal of Magnetism and Magnetic Materials

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In this paper, the magnetic ageing of a bulk forged non-annealed magnetic core, used in claw pole synchronous machine, is investigated. The study is carried out by characterizing the material properties of two groups of samples subjected to a thermal ageing at 180 °C that corresponds to the maximum operating temperature of the claw pole rotor. The investigated characteristics are the electrical conductivity, the magnetic properties, the material microstructure and the Vickers hardness. They were characterized along with the ageing time.The results show that, during the thermal ageing, the hysteresis losses and the Vickers hardness have been affected by the magnetic ageing, whereas the electric conductivity and the normal B-H curve have not been modified. The microstructure analyses showed that carbides precipitates were the main cause behind the magnetic ageing. Moreover, the comparison between the results of two groups of samples revealed the possibility that the magnetic ageing of the material could have started during the manufacturing process of the magnetic core.

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Consequences of magnetic aging for iron losses in electrical steels

Cited by 27 publications

References 15 publications

Magnetic Aging, Anomalous and Hysteresis Losses

Magnetic Aging, Anomalous and Hysteresis Losses

Kinetics of Magnetic Ageing of 2%Si Non-oriented Grain Electrical Steel

Magnetic ageing investigation of bulk low-carbon silicon steel

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