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Jan Melkebeek - One of the best experts on this subject based on the ideXlab platform.
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Loss Separation and parameters for hysteresis modelling under compressive and tensile stresses
Journal of Magnetism and Magnetic Materials, 2004Co-Authors: Viatcheslav Permiakov, Luc Dupré, Alexandre Pulnikov, Jan MelkebeekAbstract:Abstract The study of the energy Loss in electrical steels is based on the Separation of total Losses into hysteresis, classical and excess Losses according to the statistical theory. In this article, the stress dependence of the hysteresis Loss W h and of the excess Loss parameter V 0 , both related to the microstructure, is investigated for a nonoriented 3% Si–Fe grade under compressive and tensile stress and at plastic deformation. Parameters W h and V 0 for hysteresis and excess Losses modeling increase under compression and high plastic tension and decrease under small elastic tension.
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Dynamic hysteresis modelling using feed-forward neural networks
Journal of Magnetism and Magnetic Materials, 2002Co-Authors: Dimitre Makaveev, Luc Dupré, Marc De Wulf, Jan MelkebeekAbstract:A computational model for dynamic hysteresis in laminated SiFe alloys is proposed, based on feed-forward neural networks. The model employs the Loss-Separation property of ferromagnetic materials and combines a rate-independent hysteresis model with a correction technique for dynamic effects at each time point. The model yields accurate prediction of BH loops for arbitrary waveforms and frequencies, as they occur in electrical motors.
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Magnetic properties and Loss Separation in iron powder soft magnetic composite materials
Journal of Applied Physics, 2002Co-Authors: Marc De Wulf, Luc Dupré, Ljubomir Anestiev, Ludo Froyen, Jan MelkebeekAbstract:New developments in powder metallurgical composites make soft magnetic composite (SMC) material interesting for application in electrical machines, when combined with new machine design rules and new production techniques. In order to establish these design rules, one must pay attention to electromagnetic Loss characteristics of SMC material. In this work, five different series of iron based SMCs are produced and studied: (1) Pure iron powder with resin; (2) sintered iron based powders; (3) pure iron powder with additions of Zn-st and carbon; (4) iron based powder alloys (Fe,Nb,Si); (5) commercially available iron powder “Somaloy.” The specimens were shaped as rectangular rods and characterized on a miniature single sheet tester which was calibrated to Epstein. The measured energy Losses are analyzed following the Loss Separation theory of Bertotti, in which the total energy Loss is decomposed into hysteresis Loss, classical Foucault Loss, and an excess Loss component.
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rotational Loss Separation in grain oriented fe si
Journal of Applied Physics, 2000Co-Authors: Luc Dupré, Am Rietto, F Fiorillo, C Appino, Jan MelkebeekAbstract:Rotational and alternating magnetic Losses have been investigated in high permeability grain-oriented laminations as a function of frequency (2.5 Hz⩽f⩽150 Hz) and peak magnetization (0.15 T⩽Ip⩽1.7 T). The results have been analyzed according to the concept of Loss Separation. The rotational hysteresis Whrot and excess Wexcrot energy Loss components exhibit a similar increasing behavior with the magnetization Ip and reach a maximum value around 1.5–1.6 T. Wexcrot shows, in particular, a definite f1/2 dependence. The ratios between rotational and alternating hysteresis and excess Losses (Rh=Whrot/Whalt, Rexc=Wexcrot/Wexcalt) follow similar trends with Ip, with their values depending, however, on the testing configuration adopted for the alternating Loss measurements (single strip versus X-stacked strips). The 90° domain wall transitions between the in-plane [001] and the out-of-plane [100] and [010] directions are the basic Loss producing mechanism under rotational fields, but, on approaching the saturatio...
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Rotational Loss Separation in grain-oriented Fe–Si
Journal of Applied Physics, 2000Co-Authors: Luc Dupré, C. Appino, Fausto Fiorillo, Am Rietto, Jan MelkebeekAbstract:Rotational and alternating magnetic Losses have been investigated in high permeability grain-oriented laminations as a function of frequency (2.5 Hz⩽f⩽150 Hz) and peak magnetization (0.15 T⩽Ip⩽1.7 T). The results have been analyzed according to the concept of Loss Separation. The rotational hysteresis Whrot and excess Wexcrot energy Loss components exhibit a similar increasing behavior with the magnetization Ip and reach a maximum value around 1.5–1.6 T. Wexcrot shows, in particular, a definite f1/2 dependence. The ratios between rotational and alternating hysteresis and excess Losses (Rh=Whrot/Whalt, Rexc=Wexcrot/Wexcalt) follow similar trends with Ip, with their values depending, however, on the testing configuration adopted for the alternating Loss measurements (single strip versus X-stacked strips). The 90° domain wall transitions between the in-plane [001] and the out-of-plane [100] and [010] directions are the basic Loss producing mechanism under rotational fields, but, on approaching the saturatio...
Luc Dupré - One of the best experts on this subject based on the ideXlab platform.
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Magnetic network model including Loss Separation and Preisach principles for the evaluation of core Losses in devices
Journal of Applied Physics, 2005Co-Authors: Luc Dupré, Peter Sergeant, Lode VandenbosscheAbstract:In this paper, a method is developed to calculate the core Loss in a switched reluctance machine. The magnetic circuit of the motor is described as a magnetic network. The electromagnetic behavior of each magnetic network element takes into account the iron Loss using the Preisach model and the principle of Loss Separation. Using the numerical routines, the local core Loss in the different motor sections is calculated. The global core Loss is compared with the experimentally determined core Loss.
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Loss Separation and parameters for hysteresis modelling under compressive and tensile stresses
Journal of Magnetism and Magnetic Materials, 2004Co-Authors: Viatcheslav Permiakov, Luc Dupré, Alexandre Pulnikov, Jan MelkebeekAbstract:Abstract The study of the energy Loss in electrical steels is based on the Separation of total Losses into hysteresis, classical and excess Losses according to the statistical theory. In this article, the stress dependence of the hysteresis Loss W h and of the excess Loss parameter V 0 , both related to the microstructure, is investigated for a nonoriented 3% Si–Fe grade under compressive and tensile stress and at plastic deformation. Parameters W h and V 0 for hysteresis and excess Losses modeling increase under compression and high plastic tension and decrease under small elastic tension.
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Dynamic hysteresis modelling using feed-forward neural networks
Journal of Magnetism and Magnetic Materials, 2002Co-Authors: Dimitre Makaveev, Luc Dupré, Marc De Wulf, Jan MelkebeekAbstract:A computational model for dynamic hysteresis in laminated SiFe alloys is proposed, based on feed-forward neural networks. The model employs the Loss-Separation property of ferromagnetic materials and combines a rate-independent hysteresis model with a correction technique for dynamic effects at each time point. The model yields accurate prediction of BH loops for arbitrary waveforms and frequencies, as they occur in electrical motors.
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Magnetic properties and Loss Separation in iron powder soft magnetic composite materials
Journal of Applied Physics, 2002Co-Authors: Marc De Wulf, Luc Dupré, Ljubomir Anestiev, Ludo Froyen, Jan MelkebeekAbstract:New developments in powder metallurgical composites make soft magnetic composite (SMC) material interesting for application in electrical machines, when combined with new machine design rules and new production techniques. In order to establish these design rules, one must pay attention to electromagnetic Loss characteristics of SMC material. In this work, five different series of iron based SMCs are produced and studied: (1) Pure iron powder with resin; (2) sintered iron based powders; (3) pure iron powder with additions of Zn-st and carbon; (4) iron based powder alloys (Fe,Nb,Si); (5) commercially available iron powder “Somaloy.” The specimens were shaped as rectangular rods and characterized on a miniature single sheet tester which was calibrated to Epstein. The measured energy Losses are analyzed following the Loss Separation theory of Bertotti, in which the total energy Loss is decomposed into hysteresis Loss, classical Foucault Loss, and an excess Loss component.
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rotational Loss Separation in grain oriented fe si
Journal of Applied Physics, 2000Co-Authors: Luc Dupré, Am Rietto, F Fiorillo, C Appino, Jan MelkebeekAbstract:Rotational and alternating magnetic Losses have been investigated in high permeability grain-oriented laminations as a function of frequency (2.5 Hz⩽f⩽150 Hz) and peak magnetization (0.15 T⩽Ip⩽1.7 T). The results have been analyzed according to the concept of Loss Separation. The rotational hysteresis Whrot and excess Wexcrot energy Loss components exhibit a similar increasing behavior with the magnetization Ip and reach a maximum value around 1.5–1.6 T. Wexcrot shows, in particular, a definite f1/2 dependence. The ratios between rotational and alternating hysteresis and excess Losses (Rh=Whrot/Whalt, Rexc=Wexcrot/Wexcalt) follow similar trends with Ip, with their values depending, however, on the testing configuration adopted for the alternating Loss measurements (single strip versus X-stacked strips). The 90° domain wall transitions between the in-plane [001] and the out-of-plane [100] and [010] directions are the basic Loss producing mechanism under rotational fields, but, on approaching the saturatio...
Fausto Fiorillo - One of the best experts on this subject based on the ideXlab platform.
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Loss Separation in soft magnetic composites
Journal of Applied Physics, 2011Co-Authors: Olivier Barriere, C. Appino, Frederic Mazaleyrat, Mohamed Gabsi, Fausto Fiorillo, Ragusa Carlo, Hamid Ben Ahmed, Martino LobueAbstract:We report and discuss significant results on the magnetic Losses and their frequency dependence in soft magnetic composites. Two types of bonded Fe-based materials have been characterized at different inductions from dc to 10 kHz and analyzed by extending the concept of Loss Separation and the related statistical theory to the case of heterogeneous materials. Starting from the experimental evidence of eddy current confinement inside the individual particles, the classical Loss component is calculated for given particle size distribution. Taking then into account the contribution of the experimentally determined quasistatic (hysteresis) Loss, the excess Loss component is obtained and quantitatively assessed. Its behavior shows that the dynamic homogenization of the magnetization process with frequency, a landmark feature of magnetic laminations, is restrained in these materials. This results into a partial offset of the Loss advantage offered by the eddy current confinement.
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Prediction of magnetic power Losses in soft laminations under DC-biased supply
Journal of Magnetism and Magnetic Materials, 2004Co-Authors: Edoardo Barbisio, Fausto Fiorillo, O. Bottauscio, Mario Chiampi, Carlo Stefano RagusaAbstract:Power Losses in soft magnetic laminations under DC-biased supply are predicted by applying two different approaches. A simple analytical formulation, based on the concept of Loss Separation, is provided first, which requires the knowledge of a major quasi-static hysteresis loop and two-frequency conventional Loss measurement as the sole input information. A numerical finite element solution to the electromagnetic field distribution in the material, associated with application of the dynamic Preisach model of magnetic hysteresis, is also performed. It is shown that the latter overcomes limitations of the former ensuing from appearance of the skin effect at high frequencies.
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Rotational Loss Separation in grain-oriented Fe–Si
Journal of Applied Physics, 2000Co-Authors: Luc Dupré, C. Appino, Fausto Fiorillo, Am Rietto, Jan MelkebeekAbstract:Rotational and alternating magnetic Losses have been investigated in high permeability grain-oriented laminations as a function of frequency (2.5 Hz⩽f⩽150 Hz) and peak magnetization (0.15 T⩽Ip⩽1.7 T). The results have been analyzed according to the concept of Loss Separation. The rotational hysteresis Whrot and excess Wexcrot energy Loss components exhibit a similar increasing behavior with the magnetization Ip and reach a maximum value around 1.5–1.6 T. Wexcrot shows, in particular, a definite f1/2 dependence. The ratios between rotational and alternating hysteresis and excess Losses (Rh=Whrot/Whalt, Rexc=Wexcrot/Wexcalt) follow similar trends with Ip, with their values depending, however, on the testing configuration adopted for the alternating Loss measurements (single strip versus X-stacked strips). The 90° domain wall transitions between the in-plane [001] and the out-of-plane [100] and [010] directions are the basic Loss producing mechanism under rotational fields, but, on approaching the saturatio...
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Effect of tensile and compressive stress on dynamic loop shapes and power Losses of FeSi electrical steels
Journal of Magnetism and Magnetic Materials, 1999Co-Authors: Martino Lobue, Fausto Fiorillo, Vittorio Basso, G. BertottiAbstract:Abstract Magnetic energy Losses and hysteresis loops have been determined in FeSi non-oriented laminations as a function of the applied compressive and tensile stress, made to range between − 50 and + 50 MPa. The Loss Separation analysis has been carried out in association with hysteresis loop calculation by means of the Dynamic Preisach Model. The strong modifications to the hysteresis loop and area introduced in a specific way by compressive stresses can be correctly accounted for by modelling.
Fernando José Gomes Landgraf - One of the best experts on this subject based on the ideXlab platform.
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The influence of different voltage waveforms and grain sizes in electrical steels Losses
Journal of Magnetism and Magnetic Materials, 2008Co-Authors: C. Simao, M.f. De Campos, Nelson Sadowski, Nelson Jhoe Batistela, Fernando José Gomes LandgrafAbstract:Abstract Square and two-level pulse width modulation (PWM) magnetic induction waveforms are investigated and their effect on electrical steels Losses as a function of the grain size is determined. The increase of hysteresis Losses—as compared to that resulting from sinusoidal voltages—occurs only for two-level PWM waveforms. Total Losses are lower for square waveform, and the difference between Losses under square and sinusoidal waveform increase with increasing grain size, result explained with the Loss Separation model.
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Magnetic properties of 6.5% silicon content non-oriented electrical steel under sine and PWM excitation
Journal of Magnetism and Magnetic Materials, 2008Co-Authors: J. Leicht, Anthony John Moses, Fernando José Gomes Landgraf, Nicolau Apoena Castro, E.c. Silva, T. YonamineAbstract:Abstract The specific total Loss of 6.5% silicon content electrical steel, 0.1 mm thick, was measured under sine and pulse width modulation (PWM) excitation conditions. The Loss Separation is presented in order to assess the effect of high electrical resistivity and the low thickness on the eddy current and excess Losses. The hysteresis Loss was subdivided into high and low induction and the results were compared to those obtained in 3% SiFe steel. The texture of the samples was measured and discussed relating their effect on the magnetic properties of the material. The results from the texture indicate that its hysteresis Loss can be further improved.
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Consequences of magnetic aging for iron Losses in electrical steels
Journal of Magnetism and Magnetic Materials, 2006Co-Authors: Marcos Flavio De Campos, M. Emura, Fernando José Gomes LandgrafAbstract:Abstract Electrical steels, when submitted to operation, present continuous decrease of their magnetic properties, depending on the carbon content. This effect is attributed to the increase of the size of carbides, a process also known as coarsening or Ostwald Ripening. Loss Separation can offer a better understanding of this phenomenon. Experimental results show that all effect of aging is inside the hysteresis Loss component, with the excess Losses unaffected. The carbon content in electrical steels should be less than 25 ppm to avoid magnetic aging.
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Consequences of magnetic aging for iron Losses in electrical steels
Journal of Magnetism and Magnetic Materials, 2006Co-Authors: Marcos Flavio De Campos, M. Emura, Fernando José Gomes LandgrafAbstract:Abstract Electrical steels, when submitted to operation, present continuous decrease of their magnetic properties, depending on the carbon content. This effect is attributed to the increase of the size of carbides, a process also known as coarsening or Ostwald Ripening. Loss Separation can offer a better understanding of this phenomenon. Experimental results show that all effect of aging is inside the hysteresis Loss component, with the excess Losses unaffected. The carbon content in electrical steels should be less than 25 ppm to avoid magnetic aging.
Amir Hossei Taghvaei - One of the best experts on this subject based on the ideXlab platform.
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Structural studies, magnetic properties and Loss Separation in iron–phenolicsilane soft magnetic composites
Materials & Design, 2010Co-Authors: Amir Hossei Taghvaei, H Shokrollahi, Kamal JanghorbanAbstract:Abstract In this work, six different series of iron based soft magnetic composites are produced and studied: (1) passive iron powder; (2) passive iron powder-0.7% resin with coupling agent; (3) passive iron powder-0.7% resin without coupling agent; (4) passive iron powder-1.5% resin with coupling agent; (5) passive iron powder-1.5% resin without coupling agent; (6) pure iron-1.5% resin. The specimens were shaped as cylindrical rods and characterized by fourier transform infrared spectrometer (FTIR), energy dispersive analyzer (EDX), X-ray diffraction (XRD) and indutance capacitance resistance (LCR) meter. The results show that the hysteresis Loss coefficient is close to each other for all the samples (0.0011
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structural studies magnetic properties and Loss Separation in iron phenolicsilane soft magnetic composites
Materials & Design, 2010Co-Authors: Amir Hossei Taghvaei, H Shokrollahi, Kamal JanghorbanAbstract:Abstract In this work, six different series of iron based soft magnetic composites are produced and studied: (1) passive iron powder; (2) passive iron powder-0.7% resin with coupling agent; (3) passive iron powder-0.7% resin without coupling agent; (4) passive iron powder-1.5% resin with coupling agent; (5) passive iron powder-1.5% resin without coupling agent; (6) pure iron-1.5% resin. The specimens were shaped as cylindrical rods and characterized by fourier transform infrared spectrometer (FTIR), energy dispersive analyzer (EDX), X-ray diffraction (XRD) and indutance capacitance resistance (LCR) meter. The results show that the hysteresis Loss coefficient is close to each other for all the samples (0.0011
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eddy current and total power Loss Separation in the iron phosphate polyepoxy soft magnetic composites
Materials & Design, 2009Co-Authors: Amir Hossei Taghvaei, H Shokrollahi, K Janghorba, H AbiriAbstract:Abstract This work investigates the magnetic properties of iron–phosphate–polyepoxy soft magnetic composite materials. FTIR spectra, EDX analysis, distribution maps, X-ray diffraction pattern and density measurements show that the particles surface layer contains a thin layer of nanocrystalline/amorphous phosphate with high coverage of powders surface. In this paper, a formula for calculating the eddy current Loss and total Loss components by Loss Separation method is presented and finally the different parts of power Losses are calculated. The results show that, the contribution of eddy current in the bulk material for single coating layer (kb = 0.18) is higher in comparison with double coating layer (kb = 0.09). Moreover, iron–phosphate–polyepoxy composites (P = 0.000004f2) have lower power Loss in comparison with iron–phosphate composites (P = 0.00002f2).
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Eddy current and total power Loss Separation in the iron–phosphate–polyepoxy soft magnetic composites
Materials & Design, 2009Co-Authors: Amir Hossei Taghvaei, H Shokrollahi, Kamal Janghorban, H AbiriAbstract:Abstract This work investigates the magnetic properties of iron–phosphate–polyepoxy soft magnetic composite materials. FTIR spectra, EDX analysis, distribution maps, X-ray diffraction pattern and density measurements show that the particles surface layer contains a thin layer of nanocrystalline/amorphous phosphate with high coverage of powders surface. In this paper, a formula for calculating the eddy current Loss and total Loss components by Loss Separation method is presented and finally the different parts of power Losses are calculated. The results show that, the contribution of eddy current in the bulk material for single coating layer (kb = 0.18) is higher in comparison with double coating layer (kb = 0.09). Moreover, iron–phosphate–polyepoxy composites (P = 0.000004f2) have lower power Loss in comparison with iron–phosphate composites (P = 0.00002f2).
