Analytical Model of the Ferromagnetic Properties in Laminations Damaged by Cutting

Gmyrek, Zbigniew; Cavagnino, Andrea

doi:10.1109/ecce47101.2021.9595736

Cited by 7 publications

(4 citation statements)

References 28 publications

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“…This distance is consistent with that in which residual stresses are compensated (Fig. 13), and in line with results presented in the literature [14,26,27]. At low magnetic field strength, in the case of laser cutting, the degraded domain structure additionally deteriorates the macroscopic properties.…”

Section: Discussionsupporting

confidence: 92%

“…Analytical models describing changes in the material properties of the zones located at the cut edges can be found in the literature. In the available literature, there are several interesting papers that use this simple assumption [10,[24][25][26][27].…”

Section: Analytical Model Of Changes In Magnetic Permeability Of Mate...mentioning

confidence: 99%

“…Thus, after rescaling the 𝑦-axis values by the factor 1/𝐻 we obtain the values of 𝜇 0 𝜇 𝑟 (𝑥, 𝐻) magnetic permeability (averaged over cross-section of a strip) corresponding to a strip of a 𝑤 certain width (where 𝐻 is the magnetic field strength for which the measurement was made). As indicated in the available literature, the magnetic permeability change curves can be effectively approximated by exponential functions [10,[24][25][26][27]. Accepting the exponential nature of changes in magnetic permeability, the authors propose a modified relationship describing the change in magnetic permeability.…”

Section: Analytical Model Of Changes In Magnetic Permeability Of Mate...mentioning

confidence: 99%

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Investigation of local properties of the Fe-Si alloy subjected to mechanical and laser cutting

2024

Archives of Electrical Engineering

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The effective design of energy-saving electric motors with efficiency class IE4 and higher requires the use of material characteristics that take into account the core shaping process. Therefore, it becomes necessary to use analytical or numerical models that take into account the change of local properties of Fe-Si material. The aim of the work is to indicate a useful analytical model for estimating the local magnetic permeability of the material, as well as to understand the reasons for these changes. For this purpose, low-loss ferromagnetic materials cut with a guillotine and a laser were tested. Rectangular samples, cut at an angle of 0 degrees in relation to the rolling direction, were subjected to macroscopic and microscopic examinations. Finally, the main reasons for changes in material characteristics for both cutting technologies were indicated. Therefore, the proposed model takes into account not only the cutting technology used, but also the current width of the tested strip, for which the material characteristics are to be determined. The parameters of the analytical model are determined on the basis of a limited number of measurements carried out on samples of a simple geometric shape.

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Section: Discussionsupporting

confidence: 92%

Section: Analytical Model Of Changes In Magnetic Permeability Of Mate...mentioning

confidence: 99%

Section: Analytical Model Of Changes In Magnetic Permeability Of Mate...mentioning

confidence: 99%

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Investigation of local properties of the Fe-Si alloy subjected to mechanical and laser cutting

2024

Archives of Electrical Engineering

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“…We model this effect with smoothed piecewise fits based on material data from Ansys Maxwell (Ansys, Accessed 03/20/2021). Each discrete function is selected such that the overall permeability fit qualitatively matches regular permeability curve trends (Jaafar et al, 2004;Hao et al, 2020;Gmyrek and Cavagnino, 2021). To guarantee differentiability, we use a cubic function to fit the center region of the data.…”

Section: Electromagnetic Modelingmentioning

confidence: 99%

Geometric design of electric motors using adjoint-based shape optimization

Scotzniovsky,

Xiang,

Cheng

et al. 2024

Optim Eng

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Interest in electric aircraft has increased due to developments in electric propulsion technology and concerns regarding aircraft carbon emissions. The emerging urban air mobility (UAM) industry aims to provide convenient short-range air travel using electric aircraft. An important factor in the design of electric aircraft is the modeling and design of electric motors. The many degrees of freedom in electric motor design makes it a complex design problem. To mitigate this complexity, we have developed a novel adjoint-based electric motor design methodology using finite-element electromagnetic analysis and PDE-based mesh warping with exact derivatives. This paper highlights the approach and details of the proposed method and presents results from its application to a representative motor design problem. The optimization results in a 35% decrease in motor mass and a 3% increase in efficiency in comparison to the baseline design. These results demonstrate the efficacy of an adjoint-based optimization approach with exact analytical derivatives for electric motor design.

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Standardisation concept for rapid testing of effects of cutting on losses of electric steel and amorphous ribbon

Pfützner,

Shilyashki,

Christodoulou

2024

IET Electric Power Appl

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Soft magnetic lamination is produced with high width that usually is reduced by cutting. It yields permeability decreases Ɵ and loss increases r. So far, existing corresponding data is not consistent, since derived from strongly different lamination widths W. A consistent, ultra‐rapid test method is suggested, for international standardisation. It is based on a multi‐frequency single sheet tester. A 50 cm long, precisely prepared material sample of W = 17 cm is inserted into it, for an initial measurement in non‐cut state. Then, it is cut into two 8.5 cm wide strips, for a test in cut state. Changes Ɵ and r are evaluated for induction values B up to 1.8 T. They are rapidly measured for frequencies of 50, 400 and 1000 Hz. Results from steel are described for guillotine cutting, from amorphous ribbon also for scissors. As a general tendency, Ɵ exceeds r by an order of about 3, however, with low reproducibility. Thus, standardisation is suggested for loss‐rise functions r(B) only. Examples of r‐functions reveal strong individual differences, as foot‐prints of different products. With increasing f, r‐values tend to sink. With increasing B, they rise, except for high B of NO steel. Amorphous ribbon shows non‐clarified deviating tendencies. Standardisation of r‐tests promises comparable information on cutting effects, for a given material, through a given cutting tool—but also on the tool's state of wear.

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Analytical Model of the Ferromagnetic Properties in Laminations Damaged by Cutting

Cited by 7 publications

References 28 publications

Investigation of local properties of the Fe-Si alloy subjected to mechanical and laser cutting

Investigation of local properties of the Fe-Si alloy subjected to mechanical and laser cutting

Geometric design of electric motors using adjoint-based shape optimization

Standardisation concept for rapid testing of effects of cutting on losses of electric steel and amorphous ribbon

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