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Number of results: 7
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Measurement and simulation of a rotational single sheet tester

Fabian Müller Gregor Bavendiek Benedikt Schauerte Kay Hameyer
Archives of Electrical Engineering | 2019 | vol. 68 | No 1 | 173-183 | DOI: 10.24425/aee.2019.125988
Keywords finite element method magnetic hysteresis magnetization processes soft magnetic material
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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.

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Authors and Affiliations

Fabian Müller
Gregor Bavendiek
Benedikt Schauerte
ORCID: ORCID
Kay Hameyer
ORCID: ORCID

Hard magnetic material measurements in a pulsed field magnetometer considering coating and eddy current effects

Alexander Kern Nora Leuning Kay Hameyer
Archives of Electrical Engineering | 2023 | vol. 72 | No 2 | 407-414 | DOI: 10.24425/aee.2023.145416
Keywords eddy current effects hard magnetic materials magnetic property measurement
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Abstract

Rare-earth permanent magnets are coated in order to avoid corrosion. When considering the rated geometrical properties of a sample, the coating thickness has to be known precisely as it wrongly enlarges the magnetically active volume which in turn affects the accuracy of the measured magnetic properties. In this work, the sensitivity of hard magnetic material property measurements regarding the consideration of different coating thicknesses is evaluated. Moreover, the impact of eddy current effects on the magnetic properties is studied when measuring in an open circuit. Additionally, an outlook for a measurement-based determination of the electric conductivity of permanent magnet samples is given.
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Authors and Affiliations

Alexander Kern
1
ORCID: ORCID
Nora Leuning
1
ORCID: ORCID
Kay Hameyer
1
ORCID: ORCID
  1. Institute of Electrical Machines (IEM), RWTH Aachen University, Schinkelstr. 4, D-52062 Aachen, Germany

Testing and modeling of constant magnetic field cylindrical magnetoelectric sensors output characteristics

Karol Kuczynski Piotr Bilski Adrian Bilski Jerzy Szymanski
Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 1 | e144583 | DOI: 10.24425/bpasts.2023.144583
Keywords magnetoelectric effect magnetostriction magnetometers amorphous magnetic materials piezoelectric materials
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Abstract

The paper presents the novel concept of the magnetoelectric sensor constructed using the amorphous glass ribbon. Its output characteristics (voltage pattern), conditions of work and experimental results are presented. The novel construction allows for minimizing the demagnetizing field in the core of the sensor and linearization of the characteristics between the magnetic field and obtained voltage. Conducted experiments were aimed at determining the sensor operation in the presence of the constant magnetic field (HDC). The main concern of the tests was to verify the linear dependency between the HDC value and the amplitude of the output voltage. Next, the computer model representing the sensor behavior in the constant magnetic field is described. The model implements the parameter identification task based on the regression algorithms. The presented work shows that the proposed device can be used to measure the weak magnetic field and the dependency between the output signal amplitudes and the constant component in the measured magnetic field is approximately linear. This enables measurements of even weak fields.
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Authors and Affiliations

Karol Kuczynski
1
ORCID: ORCID
Piotr Bilski
1
ORCID: ORCID
Adrian Bilski
2
ORCID: ORCID
Jerzy Szymanski
3
ORCID: ORCID
  1. Warsaw University of Technology, Faculty of Electronics and Information Technology, Institute of Radioelectronics and Multimedia Technology, Poland
  2. Warsaw University of Life Sciences, Poland
  3. Kazimierz Pulaski University of Technology and Humanities in Radom, Faculty of Transport, Electrical Engineering and Computer Science, Poland

Operating point resolved loss computation in electrical machines

Simon Steentjes Georg Von Pfingsten Andreas Ruf Marco Hombitzer David Franck Kay Hameyer Rwth
Archives of Electrical Engineering | 2016 | vol. 65 | No 1 March | 73-86 | DOI: 10.1515/aee-2016-0006
Keywords efficiency maps material degradation magnetic losses magnetic material behaviour soft magnetic materials electrical machines
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Abstract

Magnetic circuits of electromagnetic energy converters, such as electrical machines, are nowadays highly utilized. This proposition is intrinsic for the magnetic as well as the electric circuit and depicts that significant enhancements of electrical machines are difficult to achieve in the absence of a detailed understanding of underlying effects. In order to improve the properties of electrical machines the accurate determination of the locally distributed iron losses based on idealized model assumptions solely is not sufficient. Other loss generating effects have to be considered and the possibility being able to distinguish between the causes of particular loss components is indispensable. Parasitic loss mechanisms additionally contributing to the total losses originating from field harmonics, non-linear material behaviour, rotational magnetizations, and detrimental effects caused by the manufacturing process or temperature, are not explicitly considered in the common iron-loss models, probably even not specifically contained in commonly used calibration factors. This paper presents a methodology being able to distinguish between different loss mechanisms and enables to individually consider particular loss mechanisms in the model of the electric machine. A sensitivity analysis of the model parameters can be performed to obtain information about which decisive loss origin for which working point has to be manipulated by the electromagnetic design or the control of the machine.
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Authors and Affiliations

Simon Steentjes
Georg Von Pfingsten
Andreas Ruf
Marco Hombitzer
David Franck
Kay Hameyer Rwth

The use of DSC curves and the Kronmüller theory to study the level of structural defects of Fe-based bulk amorphous alloys

Bartłomiej Jeż Marcin Nabiałek
Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 2 | e144613 | DOI: 10.24425/bpasts.2023.144613
Keywords injection-casting method bulk amorphous alloys soft magnetic materials free volume structural defects
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Abstract

This article presents the results of tests carried out on rapid quenched Fe-based alloys. The alloys were made using an injection-casting method. The actual structure of the alloys was also studied using an indirect method, based on H. Kronmüller's theorem. Based on analysis of the primary magnetization curves, in accordance with the aforementioned theory, it was found that Mo causes a change in internal regions associated with changes in the direction of the magnetization vector. The evolution of the thermal properties with increasing volume of Mo has been confirmed by the DSC curves. Addition of Mo, at the expense of the Nb component, results in changes to the crystallization process (i.e. the crystallization onset temperature and number of stages). The study showed that the addition of Mo at the expense of Nb reduces glass forming ability. Based on the DSC analysis, free volumes were determined for the alloys tested. These values were compared with the analysis of primary magnetization curves. It was found that the DSC curves can be used to indirectly describe the structure of amorphous alloys similar to the theory of the approach to ferromagnetic saturation. This approach is new and can be used by many researchers in this field.
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Authors and Affiliations

Bartłomiej Jeż
1
ORCID: ORCID
Marcin Nabiałek
2
ORCID: ORCID
  1. Department of Technology and Automation, Faculty of Mechanical Engineering and Computer Science, Czestochowa University of Technology, al. Armii Krajowej 19c, 42-200 Czestochowa, Poland
  2. Department of Physics, Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology, al. Armii Krajowej 19, 42-200 Cz ̨estochowa, Poland

TEM, HREM, L-TEM Studies of Fe-Based Soft Magnetic Melt-Spun Ribbons Subjected to Ultra-Rapid Annealing Process

Wojciech Maziarz A. Kolano-Burian M. Kowalczyk P. Błyskun R. Chulist P. Czaja M. Szlezynger A. Wójcik
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 3 | 1165-1170 | DOI: 10.24425/amm.2023.145489
Keywords soft magnetic materials ultra-rapid annealing microstructure magnetic domain structure TEM L-TEM
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Abstract

In the present work, we performed the ultra-rapid annealing (URA) process for amorphous Fe78Ni8B14 melt-spun ribbons in order to obtain fine excellent microstructure assuring the best soft magnetic properties. Several microscopic methods mainly based on transmission electron microscopy (TEM) and Lorentz TEM (L-TEM) were applied for detailed studies of the microstructure and magnetic domains structure. The investigation revealed that the optimized parameters of the URA process (500°C/0.5-5 s) lead to outstanding soft magnetic properties. A mixture containing close to 50% amorphous phase and 50% α-Fe nanocrystals of size up to 30 nm has been already obtained after annealing for 3 s. These annealing conditions appear to be the most suitable in terms of microstructure providing the best magnetic properties.
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Authors and Affiliations

Wojciech Maziarz
1
ORCID: ORCID
A. Kolano-Burian
2
ORCID: ORCID
M. Kowalczyk
3
ORCID: ORCID
P. Błyskun
3
ORCID: ORCID
R. Chulist
1
ORCID: ORCID
P. Czaja
1
ORCID: ORCID
M. Szlezynger
1
ORCID: ORCID
A. Wójcik
1
ORCID: ORCID
  1. Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Str., 30-059 Krakow, Poland
  2. Lukasiewicz Research Network – institute of non-Ferrous Metals, 5 Generała Józefa Sowińskiego str., 44-121 Gliwice, Poland
  3. Warsaw University of Technology, the Faculty of Materials Science and Engineering, 141 Wołoska stR., 02-507 Warszawa, Poland

Influence of the Cooling Rate on the Heterogeneity of the Structure in the Rapid Quenched Fe – Based Alloys with the Si Addition

B. Jeż
Archives of Metallurgy and Materials | 2024 | vol. 69 | No 1 | 231-235 | DOI: 10.24425/amm.2024.147813
Keywords Amorphous alloys primary magnetization curve soft magnetic materials magnetization in strong magnetic fields
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Abstract

The paper presents the results of research from the analysis of primary magnetization curves for Fe based amorphous alloys. Structural defects in the form of pseudodislocation dipoles occur in amorphous alloys. Using the theory developed by H. Kronmuller called the approach to ferromagnetic saturation, it is possible to indirectly observe internal stresses occurring in the volume of amorphous alloys. The magnetic structure is sensitive to all kinds of inhomogeneities that become visible in the process of high-field magnetization. It has been shown that the cooling rate of the liquid alloy has a great influence on the migration of atoms during the solidification process. Longer time of alloy formation causes more atoms to occupy ordered positions, which results in a change in the distance between the magnetic atoms and a higher degree of structure relaxation. This is indicated by a significant difference in the value of the spin wave stiffness parameter Dspf. The structural differences of the alloys were also investigated using a magnetic balance. It has been shown that the cooling rate influences insignificant differences in the course of thermomagnetic curves and the Curie temperature.
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Authors and Affiliations

B. Jeż
1
ORCID: ORCID
  1. Czestochowa University of Technology, Faculty of Mechanical Engineering and Computer Science, Department of Technology and Automati on, 19c Armii Krajowej Str., 42-200 Czestochowa, Poland

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