Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 29
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

Some physical concepts important for a hysteresis model (effective field, anhysteretic magnetization) are discussed on the example of Jiles-Atherton model. The Jiles-Atherton model reveals some drawbacks, which make this model more difficult to be applied in electrical engineering. In particular, it does not describe accurately the magnetization curves after a reversal, moreover complex magnetization cycles are poorly represented. On the other hand, the phenomenological description proposed by Takács seems to be a valuable alternative to the Jiles-Atherton formalism. The concept of effective field may be easily incorporated in the description.

Go to article

Authors and Affiliations

Krzysztof Chwastek
Download PDF Download RIS Download Bibtex

Abstract

Graphs in the thermodynamic plane acoustic pressure versus excess acoustic density representing acoustic hysteresis, are considered as indicators of relaxation processes, equilibrium parameters of a flow, and kinds of wave exciters. Some flows with deviation from adiabaticity are examined: the Newtonian flow of a thermoconducting gas, the flow of a gas with vibrational relaxation, the flow of liquid electrolyte with a chemical reaction, and the Bingham plastic flow. The total range of characteristic frequencies of a harmonic exciter is taken into account. The impulsive sound is considered as well. The peculiarities of hysteretic behaviour are discussed in dependence with the kind and degree of deviation form adiabaticity. Examples of acoustically active flows are discussed.
Go to article

Authors and Affiliations

Anna Perelomova
1

  1. Gdansk University of Technology, Faculty of Applied Physics and Mathematics, Gdansk, Poland
Download PDF Download RIS Download Bibtex

Abstract

An extension of the modified Jiles-Atherton description to include the effect of anisotropy is presented. Anisotropy is related to the value of the angular momentum quantum number J, which affects the form of the Brillouin function used to describe the anhysteretic magnetization. Moreover the shape of magnetization dependent R(m) function is influenced by the choice of the J value.
Go to article

Authors and Affiliations

Krzysztof Chwastek
Jan Szczygłowski
Download PDF Download RIS Download Bibtex

Abstract

This paper presents a method for estimation of core losses in banks of single phase power transformers that are subjected to an injected DC current such as geomagnetically induced currents (GIC). The main procedure of the core loss calculation is to obtain a magnetic flux density waveform in both time and location by using a novel algorithm based on 3D FEM inside the core and then to calculate the loss distribution based on loss separation theory. Also, a simple and effective method is proposed for estimation of losses of asymmetric minor loops by using combination of symmetric loops. The effect of DC biasing on core losses in single phase power transformers is investigated and the sensitivity of core type and material is evaluated. the results shows that DC current biasing could increase core losses up to 40 percent or even more.
Go to article

Authors and Affiliations

Seyed Mousavi
Göran Engdahl
Edris Agheb
Download PDF Download RIS Download Bibtex

Abstract

A temperature dependent model is necessary for the generation of hysteresis loops of ferromagnetic materials. In this study, a physical model based on the Jiles-Atherton model has been developed to study the effect of temperature on the magnetic hysteresis loop. The thermal effects were included through a model of behavior depending on the temperature parameters Ms and k of the Jiles-Atherton model. The temperaturedependent Jiles-Atherton model was validated through measurements made on ferrite material (3F3). The results have been found to be in good agreement with the model.

Go to article

Authors and Affiliations

A. Ladjimi
M. Mékideche
A. Babouri
Download PDF Download RIS Download Bibtex

Abstract

The fixed-point theorem is widely used in different engineering applications. The present paper focuses on its applications in optimisation. A Matlab toolbox, chich implements the branch-and-bound optimisation method based on the fixed-point theorem, is used for solving different real-life test problems, including estimation of model parameters for the Jiles-Atherton model.

Go to article

Authors and Affiliations

Krzysztof Chwastek
Download PDF Download RIS Download Bibtex

Abstract

Magnetic properties of Fe nanowire arrays (NWs) electrodeposited in anodic alumina membranes have been studied. The influence of nanowire geometry (length, pore diameter) and an external magnetic field applied during electrodeposition process on the magnetic properties of nanowire arrays was investigated. With the use of the X-ray diffraction analysis the structure of iron wires was determined. The iron wires have the regular Body Centered Cubic structure. Magnetic measurements show that shape anisotropy aligns the preferential magnetization axis along the wire axis. It was found that the application of an external magnetic field in a parallel direction to the sample surface induces magnetic anisotropy with an easy axis of magnetization following the nanowire axis. The dependence of the height of Fe wires on the electrodeposition time was determined.

Go to article

Authors and Affiliations

I. Dobosz
W. Gumowska
M. Czapkiewicz
Download PDF Download RIS Download Bibtex

Abstract

Accurate demagnetization modelling is mandatory for a reliable design of rare-earth permanent magnet applications, such as e.g. synchronous machines. The magnetization of rare-earth permanent magnets requires high magnetizing fields. For technical reasons, it is not always possible to completely and homogeneously achieve the required field strength during a pulse magnetization, due to stray fields or eddy currents. Not sufficiently magnetized magnets lose remanence as well as coercivity and the demagnetization characteristic becomes strongly nonlinear. It is state of the art to treat demagnetization curves as linear. This paper presents an approach to model the nonlinear demagnetization in dependence on the magnetization field strength. Measurements of magnetization dependent demagnetization characteristics of rare-earth permanent magnets are compared to an analytical model description. The physical meaning of the model parameters and the influence on them by incomplete magnetization are discussed for different rare-earth permanent magnet materials. Basically, the analytic function is able to map the occurring magnetization dependent demagnetization behavior. However, if the magnetization is incomplete, the model parameters have a strong nonlinear behavior and can only be partially attributed to physical effects. As a benefit the model can represent nonlinear demagnetization using a few parameters only. The original analytical model is from literature but has been adapted for the incomplete magnetization. The discussed effect is not sufficiently accurate modelled in literature. The sparse data in literature has been supplemented with additional pulsed-field magnetometer measurements.

Go to article

Authors and Affiliations

Gregor Bavendiek
Fabian Müller
Jamshid Sabirov
Kay Hameyer
ORCID: ORCID
Download PDF Download RIS Download Bibtex

Abstract

This paper presents a novel method of waveform generation in a single-sheet tester (SST) for measuring core losses and permeability in a steel sheet. Some improvements and modifications of the apparatus are also described. The improved way of working of a SST is important, especially in the extended range of polarization (up to 1.9 T). The system consists of hardware and software. Everything together was tested and has given good results. The proposed algorithm is described and compared to previously known methods.
Go to article

Authors and Affiliations

Tomasz Lerch
1
ORCID: ORCID
Michał Rad
1
ORCID: ORCID
Witold Rams
1

  1. Faculty of Electrical Engineering, Automatics, Computer Science, and Biomedical Engineering, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland
Download PDF Download RIS Download Bibtex

Abstract

This paper discusses a mem-capacitor circuit which is based on two MO-OTA along with a multiplier and 4 passive elements. This circuit is a charge-controlled memcapacitor emulator which is independent of any memristor also it consists the feature of electronic tunability. Additionally, this circuit is simpler and uses less hardware because it lacks a mutator and uses fewer active-passive components. The circuit behaviour is justified through various simulations in cadence Orcad tool with 180nm CMOS TSMC parameters. Additionally, conclusions from simulations and theory are validated experimentally through commercially available IC.
Go to article

Authors and Affiliations

Chandra Shankar
1
Anuj Nagar
1
Ashutosh Singh
1
Ankleshwar Kumar
1

  1. Department of Electronics & Communication Engineering, JSS Academy of Technical Education, NOIDA, Uttar Pradesh, India
Download PDF Download RIS Download Bibtex

Abstract

The Goss texture is a characteristic feature of grain-oriented transformer steel sheets. Generator sheets, which are produced as non-oriented steel sheets, should have isotropic features. However, measurement results of generator sheets, confirmed by crystallographic studies, indicate that these sheets are characterized by certain, quite significant anisotropy. The first purpose of this paper is to present the influence of textures of generator and transformer steel sheets on their magnetization characteristics. The second aim is to propose a method which takes into account the sheet textures in the calculations of magnetization curves. In calculations of magnetization processes in electrical steel sheets, models in which the plane of a sheet sample is divided into an assumed number of specified directions are used. To each direction a certain hysteresis loop, the so-called direction hysteresis, is assigned. The parameters of these direction hystereses depend, among other things, on the texture type in these steel sheets. This paper discusses the method which calculates the parameters of these direction hystereses taking into account the given sheet texture. The proposed method gives a possibility of determining the magnetization characteristics for any direction of the field intensity changes.

Go to article

Authors and Affiliations

Witold Mazgaj
Adam Warzecha
Download PDF Download RIS Download Bibtex

Abstract

In the paper an algorithm and computer code for the identification of the hysteresis parameters of the Jiles-Atherton model have been presented. For the identification the particle swarm optimization method (PSO) has been applied. In the optimization procedure five design variables has been assumed. The computer code has been elaborated using Delphi environment. Three types of material have been examined. The results of optimization have been compared to experimental ones. Selected results of the calculation for different material are presented and discussed.

Go to article

Authors and Affiliations

Łukasz Knypiński
Lech Nowak
Piotr Sujka
Kazimierz Radziuk
Download PDF Download RIS Download Bibtex

Abstract

Measurements of dynamic surface tension were carried out in aqueous systems (water or 0.1 mM Triton X-100) comprising nanoparticles formed from chemically modified polyaldehyde dextran (PAD). The nanostructures, considered as potential drug carriers in aerosol therapy, were obtained from biocompatible polysaccharides by successive oxidation and reactive coiling in an aqueous solution. The dynamic surface tension of the samples was determined by the maximum bubble pressure (MBP) method and by the axisymmetric drop shape analysis (ADSA). Experiments with harmonic area perturbations were also carried out in order to determine surface dilatational viscoelasticity. PAD showed a remarkable surface activity. Ward-Tordai equation was used to determine the equilibrium surface tension and diffusion coefficient of PAD nanoparticles (D = 2.3×10-6 m2/s). In a mixture with Triton X-100, PAD particles showed co-adsorption and synergic effect in surface tension reduction at short times (below 10 s). Tested nanoparticles had impact on surface rheology in a mixed system with nonionic surfactant, suggesting their possible interactions with the lung surfactant system after inhalation. This preliminary investigation sets the methodological approach for further research related to the influence of inhaled PAD nanoparticles on the lung surfactant and mass transfer processes in the respiratory system.

Go to article

Authors and Affiliations

Katarzyna Jabłczyńska
Tomasz R. Sosnowski
Download PDF Download RIS Download Bibtex

Abstract

Reinforced concrete composite slab consists of a thin prefabricated slab in which span reinforcement is located and of concrete joined with the slab, with such concrete being laid on site.

The existence of a joint of two concretes in such floors is interpreted as introducing a contact layer into a monolithic slab. In the paper parameters of two models are estimated. The first is a model of a contact layer and the second is a model of a composite slab with a single degree of freedom. The models consider that the contact has elastic properties and inelastic properties causing energy dissipation. Experimental investigations are discussed further based on which the parameters values of the contact layer model were determined.

Delamination was experienced for the slabs characterised by low contact layer stiffness after applying a maximum load. In addition, the strains of a contact layer having low stiffness are accompanied by lower energy dissipation than of a layer with high stiffness.

The smaller stiffness of composite floors, as compared to monolithic floors, occurs as a consequence of the existence of a joint. Such decrease for a composite slab is interpreted in the model with a single degree of freedom as the serial connection of stiffness of a monolithic slab and an element considering the existence of a contact layer.

The stiffness of an element considering the existence of a contact layer decreases along with a load, and the elements corresponding to the higher stiffness of the contact layer are characterised by higher energy dissipation.

The aforementioned results of the investigations confirm the assumptions of the contact layer model and a composite slab model with a single degree of freedom. The findings made represent a basis for establishing a method of evaluating the condition of a joint in composite slabs according to statistical investigations.

Go to article

Authors and Affiliations

K. Gromysz
Download PDF Download RIS Download Bibtex

Abstract

The ways of the improvement of the method for the determination of steel losses in the electrical devices of basic types are substantiated. The method is refined by taking into account the magnetic system properties at high saturation. The presence of the interrelation between the special features of the domain structure movement and the shape of the hysteresis loop is proved for laminated cores. It enabled the explanation of the causes for the abnormally high values of the losses in the steel and the atypical shapes of the hysteresis loops at its high saturation. The empiric dependence for the determination of steel losses is obtained. It provides for the high convergence of the calculated and experimental data at the actual degree of saturation and can be used in the direct-current operation of the analyzed devices.

Go to article

Authors and Affiliations

Mykhaylo Zagirnyak
Viacheslav Prus
Dmitro Rodkin
Yurii Zachepa
Volodymyr Chenchevoi
Download PDF Download RIS Download Bibtex

Abstract

The purpose of this paper is to focus on the loss separation of non-grain-oriented electrical steels used for speed-variable rotating electrical machines. The impact of laser-cutting, used in prototype manufacturing and of flux density harmonics, occurring locally in the lamination, on the loss distribution is studied in detail. Iron losses occurring under operation can physically be separated in different loss components. In this paper, a frequency-based loss model with parameters identified for single-sheet tester specimens, cut in strips of different widths, is therefore used. Moreover, a time-domain approach considers loss distributions occurring from higher harmonics. Hysteresis losses having high sensitivity to cut edge effects are calculated by the well-known Jiles-Atherton model adapting the frequency-based loss parameters. The model is validated by free-curve measurements at a single-sheet tester. It has been shown that the studied elliptical hysteresis model becomes inaccurate particularly for specimens with small strip widths with similar dimensions as teeth of electrical machine laminations. The incorrect mapping of losses occurring from minor hysteresis loops due to higher harmonics is concluded. The results showconsequently that both, the impact of a cut edge effect and local distributions of flux density harmonics need to be considered in terms of accurate iron loss prediction of electrical machine design.

Go to article

Authors and Affiliations

Christoph Mülder
Silas Elfgen
Kay Hameyer
ORCID: ORCID
Download PDF Download RIS Download Bibtex

Abstract

The accurate prediction of iron losses has become a prominent problem in electromagnetic machine design. The basis of all iron loss models is found in the spatial field-locus of the magnetic flux density (B) and magnetic field (H). In this paper the behavior of the measured BH-field-loci is considered in FEM simulation. For this purpose, a vector hysteresis model is parameterized based on the global measurements, which then can be used to reproduce the measurement system and obtain more detailed insights on the device and its local field distribution. The IEM has designed a rotary loss tester for electrical steel, which can apply arbitrary BH-field-loci occurring during electrical machine operation. Despite its simplicity, the proposed pragmatic analytical model for vector hysteresis provides very promising results.

Go to article

Authors and Affiliations

Fabian Müller
Gregor Bavendiek
Benedikt Schauerte
ORCID: ORCID
Kay Hameyer
ORCID: ORCID
Download PDF Download RIS Download Bibtex

Abstract

In the paper, the mathematical model of coupled electromagnetic and thermal phenomena in the pulse transformer taking into account the magnetic hysteresis is presented. For the mapping of magnetic hysteresis, Jiles-Atherton model is applied. In order to solve field equations, the finite element method (FEM), "step-by-step" procedure and Newton-Raphson algorithm are used. Software elaborated on this basis is used for analysis of hysteresis loss in the core. Selected results of investigations are shown.
Go to article

Authors and Affiliations

Wiesław Łyskawiński
Piotr Sujka
Wojciech Szeląg
Mariusz Barański
Download PDF Download RIS Download Bibtex

Abstract

This paper presents a new grid integration control scheme that employs spider monkey optimization technique for maximum power point tracking and Lattice Levenberg Marquardt Recursive estimation with a hysteresis current controller for controlling voltage source inverter. This control scheme is applied to a PV system integrated to a three phase grid to achieve effective grid synchronization. To verify the efficacy of the proposed control scheme, simulations were performed. From the simulation results it is observed that the proposed controller provides excellent control performance such as reducing THD of the grid current to 1.75%.
Go to article

Bibliography

[1] I. Dincer: Renewable energy and sustainable development: a crucial review. Renewable and Sustainable Energy Reviews, 4(2), (2000), 157–175, DOI: 10.1016/S1364-0321(99)00011-8.
[2] S. Gulkowski, J.V.M. Diez, J.A. Tejero, and G. Nofuentes: Computational modeling and experimental analysis of heterojunction with intrinsic thin-layer photovoltaic module under different environmental conditions. Energy, 172, (2019), 380–390, DOI: 10.1016/j.energy.2019.01.107.
[3] M. Bahrami, et al.: Hybrid maximum power point tracking algorithm with improved dynamic performance. Renewable Energy, 130, (2019), 982–991, DOI: 10.1016/j.renene.2018.07.020.
[4] K.V. Singh, Krishna, H. Bansal, and D. Singh: A comprehensive review on hybrid electric vehicles: architectures and components. Journal of Modern Transportation, 27, (2019), 1–31, DOI: 10.1007/s40534-019-0184-3.
[5] S. Pradhan, et al.: Performance Improvement of Grid-Integrated Solar PV System Using DNLMS Control Algorithm. IEEE Transactions on Industry Applications, 55(1), (2019), 78–91, DOI: 10.1109/TIA.2018.2863652.
[6] S. Negari and D. Xu: Utilizing a Lagrangian approach to compute maximum fault current in hybrid AC–DC distribution grids withMMCinterface. High Voltage, 4(1), (2019), 18–27, DOI: 10.1049/hve.2018.5087.
[7] V.T. Tran et al.: Mitigation of Solar PV Intermittency Using Ramp-Rate Control of Energy Buffer Unit. IEEE Transactions on Energy Conversion, 34(1), (2019), 435–445, DOI: 10.1109/TEC.2018.2875701.
[8] A. Kihal, et al.: An improved MPPT scheme employing adaptive integral derivative sliding mode control for photovoltaic systems under fast irradiation changes. ISA Transactions, 87, (2019), 297–306, DOI: 10.1016/j.isatra.2018.11.020.
[9] A.M. Jadhav, N.R. Patne, and J.M. Guerrero: A novel approach to neighborhood fair energy trading in a distribution network of multiple microgrid clusters. IEEE Transactions on Industrial Electronics, 66(2), (2019), 1520– 1531, DOI: 10.1109/TIE.2018.2815945.
[10] A. Fragaki, T. Markvart, and G. Laskos: All UK electricity supplied by wind and photovoltaics – The 30–30 rule. Energy, 169, (2019), 228–237, DOI: 10.1016/j.energy.2018.11.151.
[11] S.Z. Ahmed, et al.: Power quality enhancement by using D-FACTS systems applied to distributed generation. International Journal of Power Electronics and Drive Systems, 10(1), (2019), 330, DOI: 10.11591/ijpeds.v10.i1.pp330-341.
[12] H.H. Alhelou, et al.: A Survey on Power System Blackout and Cascading Events: Research Motivations and Challenges. Energies. 12(4), (2019), 1– 28, DOI: 10.3390/en12040682.
[13] M. Badoni, A. Singh, and B. Singh: Implementation of Immune Feedback Control Algorithm for Distribution Static Compensator. IEEE Transactions on Industry Applications, 55(1), (2019), 918–927, DOI: 10.1109/TIA.2018.2867328.
[14] S.R. Das, et al.: Performance evaluation of multilevel inverter based hybrid active filter using soft computing techniques. Evolutionary Intelligence (2019), 1–11, DOI: 10.1007/s12065-019-00217-6.
[15] F. Chishti, S. Murshid, and B. Singh: LMMN Based Adaptive Control for Power Quality Improvement of Grid Intertie Wind-PV System. IEEE Transactions on Industrial Informatics, 15(9), (2019), 4900–4912, DOI: 10.1109/TII.2019.2897165.
[16] S. Pradhan, et al.: Performance Improvement of Grid-Integrated Solar PV System Using DNLMS Control Algorithm. IEEE Transactions on Industry Applications, 55(1), (2019), 78–91, DOI: 10.1109/IICPE.2016.8079455.
[17] V. Jain, I. Hussain, and B. Singh: A HTF-Based Higher-Order Adaptive Control of Single-Stage Grid-Interfaced PV System. IEEE Transactions on Industry Applications, 55(2), (2019), 1873–1881, DOI: 10.1109/TIA.2018.2878186.
[18] N. Kumar, B. Singh, B. Ketan Panigrahi and L. Xu: Leaky Least Logarithmic Absolute Difference Based Control Algorithm and Learning Based InC MPPT Technique for Grid Integrated PV System. IEEE Transactions on Industrial Electronics. 66(11), (2019), 9003–9012, DOI: 10.1109/TIE.2018.2890497.
[19] P. Shah, I. Hussain, and B. Singh: Single-Stage SECS Interfaced with Grid Using ISOGI-FLL- Based Control Algorithm. IEEE Transactions on Industry Applications, 55(1), (2019), 701–711, DOI: 10.1109/TIA.2018.2869880.
[20] V. Jain and B. Singh: A Multiple Improved Notch Filter-Based Control for a Single-StagePVSystem Tied to aWeak Grid. IEEE Transactions on Sustainable Energy, 10(1), (2019), 238–247, DOI: 10.1109/TSTE.2018.2831704.
[21] N. Mohan and T. M. Undeland: Power electronics: converters, applications, and design. John Wiley & Sons, 2007.
[22] M. Badoni, et al.: Grid interfaced solar photovoltaic system using ZA-LMS based control algorithm. Electric Power Systems Research, 160, (2018), 261–272, DOI: 10.1016/j.epsr.2018.03.001.
[23] M. Rezkallah, et al.: Lyapunov function and sliding mode control approach for the solar-PV grid interface system. IEEE Transactions on Industrial Electronics, 64(1), (2016), 785–795, DOI: 10.1109/tie.2016.2607162.
[24] N. Kumar, B. Singh, and B.K. Panigrahi: Integration of Solar PV with Low- Voltage Weak Grid System: using Maximize-M Kalman Filter and Self-Tuned P&O Algorithm. IEEE Transactions on Industrial Electronics, 66(11), (2019), 9013–9022, DOI: 10.1109/tie.2018.2889617.
[25] H. Sharma, G. Hazrati, and J.Ch.Bansal: Spider monkey optimization algorithm. Evolutionary and swarm intelligence algorithms. Springer, Cham, 2019, 43–59.
[26] K. Neelu, P. Devan, Ch.L. Chowdhary, S. Bhattacharya, G. Singh, S. Singh, and B. Yoon: Smo-dnn: Spider monkey optimization and deep neural network hybrid classifier model for intrusion detection. Electronics, 9(4), (2020), 692, DOI: 10.3390/electronics9040692.
[27] M.A.H. Akhand, S.I. Ayon, A.A. Shahriyar, and N. Siddique: Discrete spider monkey optimization for travelling salesman problem. Applied Soft Computing, 86 (2020), DOI: 10.1016/j.asoc.2019.105887.
[28] Avinash Sharma, Akshay Sharma, B.K. Panigrahi, D. Kiran, and R. Kumar: Ageist spider monkey optimization algorithm. Swarm and Evolutionary Computation, 28 (2016), 58–77, DOI: 10.1016/j.swevo.2016.01.002.
[29] Sriram Mounika and K. Ravindra: Backtracking Search Optimization Algorithm Based MPPT Technique for Solar PV System. In Advances in Decision Sciences, Image Processing, Security and Computer Vision. Springer, Cham, 2020, 498–506.
[30] Pilakkat, Deepthi and S. Kanthalakshmi: Single phase PV system operating under Partially Shaded Conditions with ABC-PO as MPPT algorithm for grid connected applications. Energy Reports, 6 (2020), 1910–1921, DOI: 10.1016/j.egyr.2020.07.019.
[31] R. Gessing: Controllers of the boost DC-DC converter accounting its minimum- and non-minimum-phase nature. Archives of Control Sciences, 19(3), (2009), 245–259.
[32] A. Talha and H. Boumaaraf: Evaluation of maximum power point tracking methods for photovoltaic systems. Archives of Control Sciences, 21(2), (2011), 151–165.
[33] S.N. Singh and S. Mishra: FPGA implementation of DPWM utility/DG interfaced solar (PV) power converter for green home power supply. Archives of Control Sciences, 21(4), (2011), 461–469.
Go to article

Authors and Affiliations

Dipak Kumar Dash
1
Pradip Kumar Sadhu
1
Bidyadhar Subudhi
2

  1. Department of Electrical Engineering, Indian Institute of Technology (ISM), Dhanbad, India
  2. School of Electrical Sciences, Indian Institute of Technology Goa, GEC Campus, Farmagudi, Ponda-401403, Goa, India
Download PDF Download RIS Download Bibtex

Abstract

This study describes a method that allows the modelling of magnetisation processes in transformer steel sheets for any direction of the magnetic field strength. In the proposed approach, limiting hysteresis loops for the rolling and transverse directions were used. These loops are modified depending on the magnetisation angle between the direction of the field strength vector and rolling direction. For this purpose, unique correction coefficients, which are functions of the magnetisation angle, were applied for both hysteresis loops. An algorithm for determining the limiting hysteresis loops for any magnetisation angle is presented herein. The calculation results for several cases of magnetisation were compared with the measured hysteresis loops.
Go to article

Authors and Affiliations

Michał Sierżęga
1
ORCID: ORCID
Witold Mazgaj
1
ORCID: ORCID

  1. Department of Electrical Engineering, Cracow University of Technology, 24 Warszawska str., 31-155 Kraków, Poland
Download PDF Download RIS Download Bibtex

Abstract

Magnetic hysteresis occurs in most electrical engineering devices once soft ferromagnetic materials are exposed to relatively high temperatures. According to several scientific studies, magnetic properties are strongly influenced by temperature. The development of models that can accurately describe the thermal effect on ferromagnetic materials is still an issue that inspires researchers. In this paper, the effect of temperature on magnetic hysteresis for ferromagnetic materials is investigated using a self-developed numerical method based on the Preisach distribution function identification. It employs a parameter depending on both temperature and the Curie temperature. This approach is of the macroscopic phenomenological type, where the variation of the magnetization (in direct connection with the Preisach triangle) is related to the observed macroscopic hysteretic behavior. The isotropic character of the material medium is predominant. The technique relies on a few experimental data extracted from the first magnetization curve provided by metallurgists. The ultimate goal is to provide a simple and robust magnetic behavior modeling tool for designers of electrical devices. Temperature is introduced at the stage of identifying the distribution function of the Preisach model. This method is validated by the agreement between the experimental data and the simulation results. The developed method is very accurate and efficient in modeling the hysteresis of ferromagnetic materials in engineering particularly for systems with ferromagnetic components and electromagnetic-thermal coupling.
Go to article

Authors and Affiliations

Leila Chelghoum
1
ORCID: ORCID

  1. University Hadj Lakhdar Batna1, Batna, Algeria
Download PDF Download RIS Download Bibtex

Abstract

Due to speed-dependent centrifugal forces, the support of the torque, static mechanical stress introduced by manufacturing processes the laminated core of rotating electrical machines is exposed to considerable mechanical stress. The resulting stress distribution changes the magnetic properties of the electrical steel. To take this into account, a magnetization model is constituted on the basis of vector magneto-mechanical measurements that include the magnetic permeability as a function of the mechanical stress and the angle between magnetization - and the maximum principal stress direction. Subsequently, the model is integrated into the finite element simulation of a permanent magnet excited synchronous machine at different rotational speeds.
Go to article

Authors and Affiliations

Benedikt Schauerte
1
ORCID: ORCID
Xiao Xiao
1
Kevin Jansen
1
Kay Hameyer
1
ORCID: ORCID

  1. Institute of Electrical Machines (IEM), RWTH Aachen University, Schinkelstr. 4, D-52062 Aachen, Germany
Download PDF Download RIS Download Bibtex

Abstract

The article comprises synthesis of magnetically susceptible carbon sorbents based on bio raw materials – beet pulp. The synthesis was performed by one- and two-step methodology using FeCl3 as an activating agent. X-ray diffraction methods showed an increase in the distance between graphene layers to 3.7 Å in biocarbon synthesized by a two-step tech-nique and a slight decrease in inter-graphene distance to 3.55 Å for biocarbon synthesized by an one-step technique. In both magnetically susceptible samples, the Fe3O4 magnetite phase was identified. Biocarbon synthesized by a two-step technique is characterized by a microporous structure in which a significant volume fraction (about 35%) is made by pores of 2.2 and 5 nm radius. In the sample after a one-step synthesis, a significant increase in the fraction of pores with radii from 5 to 30 nm and a decrease in the proportion of pores with radii greater than 30 nm can be detected. Based on the analysis of low-angle X-ray scattering data, it is established that carbon without magnetic activation has the smallest specific area of 212 m2∙сm–3, carbon after one-stage synthesis has a slightly larger area of 280 m2∙сm–3, and after two-stage synthesis has the largest specific surface area in 480 m2∙сm–3. The adsorption isotherms of blue methylene have been studied. Biocarbon ob-tained by two-step synthesis has been shown to have significantly better adsorption properties than other synthesized bio-carbons. Isotherms have been analysed based on the Langmuir model.

Go to article

Authors and Affiliations

Christina Soloviy
ORCID: ORCID
Myroslav Malovanyy
ORCID: ORCID
Ihor Bordun
ORCID: ORCID
Fedir Ivashchyshyn
ORCID: ORCID
Anatoliy Borysiuk
Yuriy Kulyk

This page uses 'cookies'. Learn more