Relationships between grain size in self-developed soft magnetic composites and the Grucad hysteresis model

Purpose The purpose of this paper is to examine the effect of varying compaction pressure on magnetic properties of self-developed soft magnetic composite (SMC) cores. The change in shape of ferromagnetic hysteresis curves has – in turn – the impact on the values of hysteresis model parameters. The phenomenological GRUCAD model is chosen for description of hysteresis curves. Design/methodology/approach Several cylinder-shaped cores have been made from a mixture of iron powder and suspense polyvinyl chloride using a hydraulic press with a form and a band with a thermocouple for controlling heat treatment conditions. The only varying parameter in the study is the compaction pressure. The magnetic properties of developed cores have been measured using a computer-acquisition card and LabView software. The obtained hysteresis curves are fitted to the equations of the phenomenological GRUCAD model. This description is compliant with the laws of irreversible thermodynamics. The variations of model parameters are presented as functions of compacting pressure. Findings The compaction pressure has a significant impact on magnetic properties of self-developed SMC cores. The paper provides a number of charts useful for checking how the parameters of the hysteresis model are affected. Research limitations/implications The present paper is limited to modelling symmetrical loops only. Description of more complex magnetization cycles is postponed to another, forthcoming paper. Practical implications The GRUCAD hysteresis model may be a useful tool for the designers of magnetic circuits. Its parameters depend on the processing conditions (in this study – the compaction pressure) of the SMC cores. Originality/value Modelling of magnetic properties of SMC cores has been carried so far using some well-known description like Preisach, Takács and Jiles–Atherton proposals. The GRUCAD model has a number of advantages, and it may be a useful alternative to the latter formalism. So far it has been used for description of hysteresis curves in conventional materials like non-oriented and grain-oriented electrical steels. In the present work, it is applied to novel SMC materials.

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“…Forthcoming work is focussed on modelling more complex magnetization cycles like DC-biased loops (Jastrzębski et al , 2018a, 2018b).…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, we point our attention to the important practical problem for the designers of magnetic circuits: is it possible to find optimal processing parameters for SMC cores? A recently published companion study by Jastrzębski et al , 2018b) discusses the effect of grain size on magnetic properties in self-developed cores.…”

Section: The Grucad Modelmentioning

confidence: 99%

Modelling the effect of compaction pressure on hysteresis curves of self-developed SMC cores

Jakubas

Jastrzębski

Chwastek

2019

COMPEL

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“…e choice of iron powder is the result of previous research on soft magnetic composites (SMCs). In the works [12][13][14][15], it was found that there is a relationship between the size of grains and the level of magnetic induction (generally, larger grains allow us to achieve a higher B at the same level of H). e weight proportions of the components have been selected so that the magnetic paint is suitable for offset printing.…”

Section: Methodsmentioning

confidence: 99%

Examination of the Magnetic Properties in the Magnetic Circuits Formed by a Printing Technique

Jakubas

2019

Advances in Materials Science and Engineering

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In mass printing of specialist coatings on cellulose substrates, their thickness is an important factor influencing the usefulness of such coatings. The paper presented the results of testing the magnetic properties of a printing paint admixture with iron powder with a grain size <10 μm. Experimental studies were carried out on samples with three magnetic coating thicknesses: 0.2, 0.25, and 0.3, respectively. The obtained induction and magnetic field values were used to determine the relationship between the thickness of magnetic paint and its magnetic permeability. The obtained maximum values of μr were 10, 11.5, and 12.5 for samples with a thickness of 0.2, 0.25, and 0.3 mm, respectively. The value of magnetic permeability increased with the increase of coating thickness. The analysis of the properties of coatings has been supplemented with the mathematical description of the relationship between material parameters and hysteresis in magnetic materials. The proposed elliptical hysteresis approximation significantly facilitates a design and prediction of the properties of finished products. The analysis of the equivalent hysteresis angle δ showed almost linear dependence on the coating thickness. The proposed indicator (angle δ) allows a quick and simple way to verify the thickness of magnetic coatings on flexible diamagnetic substrates in production conditions.

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“…In the low-dimensional GRUCAD model [8][9][10][11], considered by us for the description of hysteresis curves of soft magnetic composites (SMCs) [12,13], the irreversible and reversible magnetization effects are decoupled and described with separated sets of equations, which also reminds the extension of T (x) model described in this section.…”

Section: The Reversible Magnetization Processesmentioning

confidence: 99%

A Comparison of Two Phenomenological Descriptions of Magnetization Curves Based on T(x) Model

2019

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Relationships between grain size in self-developed soft magnetic composites and the Grucad hysteresis model

Cited by 5 publications

References 18 publications

Modelling the effect of compaction pressure on hysteresis curves of self-developed SMC cores

Modelling the effect of compaction pressure on hysteresis curves of self-developed SMC cores

Examination of the Magnetic Properties in the Magnetic Circuits Formed by a Printing Technique

A Comparison of Two Phenomenological Descriptions of Magnetization Curves Based on T(x) Model

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