Relationship between Particle Size, Crystal Grain Size and Core Loss of Fe-Si Compressed Cores

Saito, Tsuneo; Takemoto, Satoshi

doi:10.4262/denkiseiko.77.285

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…It has been reported that the intraparticle eddy current loss in a dust core with 10 µm diameter particles is less than 1000 kW/m 3 . 17,18 Therefore, the eddy current loss in the FNAs is sufficiently small, and the experimental result is reasonable. Because no significant eddy current loss was generated for both FNAs, there is a significant difference in the hysteresis loss between these FNAs.…”

Section: -5mentioning

confidence: 79%

Core loss and magnetic susceptibility of superparamagnetic Fe nanoparticle assembly

2016

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Toroidal-shaped high-density Fe nanoparticle assemblies (FNAs) were fabricated by molding different sized Fe nanoparticles (NPs), and the effect of the magnetic behavior of the FNAs on the core loss and the magnetic susceptibility was investigated. An FNA with 4.3 nm diameter Fe NPs exhibits superparamagnetism at room temperature while an FNA with 6.4 nm diameter Fe NPs doesn’t exhibit superparamagnetism at room temperature. AC magnetization curves at 1, 10 and 100 kHz were measured to evaluate the core loss of the toroidal-shaped FNAs. Both FNAs exhibited no significant eddy current loss, which suggests that surfactants on the NP surface effectively act to electrically insulate the NPs, and the NPs are not sintered together when the FNAs are molded. The AC magnetization curves had no hysteresis for the FNA with 4.3 nm diameter Fe NPs, i.e., the core loss was minimal for the superparamagnetic FNA. The magnetic susceptibility of the superparamagnetic FNA with 4.3 nm Fe NPs was 12 times higher than that estimated from Langevin theory due to the effect of strong magnetic dipole interaction. These results suggest that the superparamagnetic FNA has potential as a magnetic core material that exhibits low core loss and high magnetic susceptibility, even at high frequency.

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Section: -5mentioning

confidence: 79%

Core loss and magnetic susceptibility of superparamagnetic Fe nanoparticle assembly

2016

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Development Trends of Small Case Size Metal Type Power Inductor

NAGANO¹,

MATSUDA²

2022

J. Jpn. Soc. Powder Powder Metallurgy

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Introducing technological trends in small case size metal type power inductors, according to the higher switching frequency, the required inductance value has become lower and the replacement of materials from ferrite to metal has progressed. The small metal type power inductors have various types of metal magnetic materials (resin composite type, oxide layer bounded type) and structures (wire winding, thin film and multi-layer type), and each type has been developed actively. The directions of development are higher current and lower loss. Therefore, the developments of the structures and the magnetic materials, such as high packing of magnetic powders, specific performances of magnetic powder materials and particle size reduction, have been in progress.

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Magnetic Properties of Atomized Fe-3 mass%Si Powder Core

雄一郎¹,

貴伸²

2008

DENKI-SEIKO[ELECTRIC FURNACE STEEL]

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Magnetic cores made by compaction with soft magnetic powder have been used for conventional chock coils of switched mode power supplies. A new application of these powder cores to motor cores is recently focused. In this paper the authors have studied the magnetic properties, especially magnetic flux density and core loss at 400 Hz of Fe-3 mass%Si powder cores made with changing atomizing process, gas atomization, modifi ed water atomization, and conventional water atomization. And we concluded as follows. 1) Gas atomized powder has the best magnetic properties, high magnetic fl ux density and low core loss compared with the others. 2) At 400 Hz excitation hysteresis loss is dominant, and eddy current loss is very small. 3) Water atomized powder has small grain size, because it is suggested that Si oxide inclusions suppress the grain growth. 4) Eddy current loss decreases with increasing core resistivity, and over about 10-4 m the loss is approximately constant. It is considered that over the critical resistivity eddy current generates only in the particle, but under the resistivity eddy current fl ows particle to particle.

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Relationship between Particle Size, Crystal Grain Size and Core Loss of Fe-Si Compressed Cores

Abstract: Synopsis

Cited by 3 publications

References 5 publications

Core loss and magnetic susceptibility of superparamagnetic Fe nanoparticle assembly

Core loss and magnetic susceptibility of superparamagnetic Fe nanoparticle assembly

Development Trends of Small Case Size Metal Type Power Inductor

Magnetic Properties of Atomized Fe-3 mass%Si Powder Core

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