A correlation of magnetic properties with material density for soft magnetic composite cores

Abstract

Purpose – The purpose of this paper is to examine the relationships between processing conditions and magnetic properties of cores made of Soft Magnetic Composite (SMC) Somaloy 500. Design/methodology/approach – The effects of compaction pressure and hardening temperature may be combined considering SMC density. This quantity may be chosen for optimization of properties of ready-made cores. In order to describe hysteresis loops the phenomenological model based on hyperbolic tangent transformation is applied. Findings – SMC density affects substantially the shape of hysteresis loop. The paper provides a number of charts useful for checking how the parameters of the hysteresis model are affected. Research limitations/implications – The present study considers just one composition of the SMC and one type of lubricant. Future research shall be devoted to verification of the approach on a wider class of SMCs. Practical implications – Material density may be a relevant quantity in optimization of magnetic properties of ready-made SMC cores. The simple hysteresis model based on the, “effective field” concept and Takács’ idea of hyperbolic tangent transformation may be useful for description of hysteresis curves of SMC cores. Model parameters are sensitive against variations of material density. Originality/value – The results of the analysis may be useful for designers of magnetic circuits made of SMCs.

A Simplified Sablik’s Approach to Model the Effect of Compaction Pressure on the Shape of Hysteresis Loops in Soft Magnetic Composite Cores

“…It can be stated that as the compaction pressure increased, the material density also increased, which implied better magnetic properties due to a higher packing ratio. The results are consistent with those obtained in Reference [55] for commercial Somaloy. A qualitatively similar dependence (exhibiting saturation after a certain threshold value) was presented in Reference [56].…”

Modeling Hysteresis Loops of Self-Developed Soft Magnetic Composite Cores Using the Jiles-Atherton-Sablik Theory

“…From Figure 6 it follows that as the compaction pressure increases, the material density also increases, what implies better magnetic properties due to a higher filling ratio. The results are consistent with those obtained in [42] for commercial Somaloy. A qualitatively similar dependence = ( ) (exhibiting saturation after a certain threshold value) was presented in Ref.…”

“…Figure 6 depicts the dependence density of the developed SMC cores versus the compaction pressure. In the paper [42] it was indicated that the material density might be a proper quantity of direct interest to the designers of magnetic circuits containing SMC materials. From Figure 6 it follows that as the compaction pressure increases, the material density also increases, what implies better magnetic properties due to a higher filling ratio.…”

Magnetic Properties of SMC Cores Produced at a Low Compacting Temperature

“…Most research work carried out on SMCs is based on commercially available products like Somaloy from Hö-ganäs [3,10,17]. For these products the processing parameters are relatively high, e.g.…”

“…Kollár et al [8] and Lauda et al [9] focused on the study of dynamic magnetic properties of Fe-based composites in a wide range of excitation frequencies. Ślusarek et al examined a correlation between SMC density and magnetic properties of ready-made cores [10].…”