Surface-Oxidized Amorphous Alloy Powder/Epoxy-Resin Composite Bulk Magnetic Core and Its Application to Megahertz Switching LLC Resonant Converter

Sugimura, Kanako; Shibamoto, Daisuke; Yabu, Naoki; Yamamoto, Tatsuya; Sonehara, Makoto; Sato, Toshiro; Matsumoto, Tsutomu; Mizusaki, Hirofumi

doi:10.1109/tmag.2017.2718042

Cited by 39 publications

(4 citation statements)

References 5 publications

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“…Table 1 lists the characteristics of the magnetic material used for magnetic coating. A magnetic composite material, in which an amorphous alloy powder and a silicone adhesive were mixed, was used as the magnetic material 18) . The ratio of the magnetic powder to the silicone adhesive in the magnetic composite material was defined as the volume filling rate, which was 57 Vol%.…”

Section: Structure Of the Power Transmission Coilmentioning

confidence: 99%

Improving Transmission Efficiency with Magnetic Coating Technology for Lightweight Wireless Power Transfer Coil Using Aluminum Plate

Endo

Sato

et al. 2019

J. Magn. Soc. Jpn.

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To improve the fuel efficiency of electric vehicles, it is necessary to reduce the weight of the wireless power transfer coil in the vehicles. Resistance due to the skin effect or the proximity effect increases during wireless power transfer, decreasing the transmission efficiency. This study aims to reduce the weight of the coil by replacing it with an aluminum plate coil, which is easy to manufacture and inexpensive. The weight of the coil was reduced by 3/4 (from 1.9 to 0.44 kg) when compared with copper Litz wire. Furthermore, the AC resistance was reduced by applying magnetic coating to the same coil. Consequently, the transmission efficiency increased from 88.2% to 89.3%, an improvement of 1.1%. The optimal material for magnetic coating was revealed in an analysis.

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Section: Structure Of the Power Transmission Coilmentioning

confidence: 99%

Improving Transmission Efficiency with Magnetic Coating Technology for Lightweight Wireless Power Transfer Coil Using Aluminum Plate

Endo

Sato

et al. 2019

J. Magn. Soc. Jpn.

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“…Coated magnetic coils can be used to reduce copper losses [9]; however, the manufacturing productivity would likely decrease because large‐scale equipment is required [10]. Magnetic flux path control technology is effective for easily reducing AC copper losses in copper wires [11–14]. This technology can suppress both the skin and proximity effects by only loading a magnetic material and guiding the magnetic flux interlinking with a copper wire to the magnetic material.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Magnetic Composite Material on Copper Loss Reductions and Misalignment in Copper‐Plate‐Coils for Wireless Power Transmission

Sato

Endo

et al. 2021

IEEJ Transactions Elec Engng

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Wireless power transmission systems are suitable for use in charging systems for plug‐in hybrid vehicles and electric vehicles, particularly when considering safety and convenience. Wireless power transmission coils are made of litz copper wire to reduce copper losses at high frequencies. However, litz wires are expensive owing to their complicated structure and large number of manufacturing steps. Herein, a copper‐plate‐coil is proposed that can be manufactured at a low cost is proposed. A magnetic flux path control technique is also proposed to reduce copper losses. The use of a magnetic composite material for realizing magnetic flux path control technology reduces the alternative current resistance by 50%. In addition, this study reports the effects of the magnetic composite material on coupling coefficients observed during coil misalignment. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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“…Magnetic powder cores (MPCs), consisting of ferromagnetic powders and electrical insulating materials formed by compacting [1], have been widely used in a range of electrical components, such as choking coils [2], inductors [3], transformers [3,4], filters [5], and so on [6]. Further developments to electronic devices are aimed at achieving a high frequency, miniaturization, and high application power.…”

Section: Introductionmentioning

confidence: 99%

Strategy to Enhance Magnetic Properties of Fe78Si9B13 Amorphous Powder Cores in the Industrial Condition

Sun

Chen

Lin

2019

Metals

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In this study, the soft magnetic properties of Fe78Si9B13 amorphous magnetic powder cores (AMPCs) were enhanced by coordinately adjusting the technological parameters, including the particle size distribution, molding pressure, and coating agent content, in the industrial condition. The results show that the optimized comprehensive soft magnetic properties of the Fe78Si9B13 AMPCs could be obtained under the following process conditions: (1) the distribution of particle size is 20 wt.% for 140–170 mesh, 70 wt.% for 170–270 mesh, and 10 wt.% for 270–400 mesh; (2) the molding pressure is in the range of 2.35–2.45 GPa; and (3) the additive amount of sodium silicate is 1.5 wt.%. After the collaborative optimization, the AMPCs’ compact density, ρ, the effective permeability, μe, and the residual effective permeability at the applied magnetizing field of 7.96 kA/m, μe@7.96 kA/m, increased from 5.61 g/cm3 to 5.86 g/cm3, from 58.13 to 77.01, and from 40.36 to 49.57, respectively. The attenuation ratio of the effective permeability, when in the frequency band of 20–100 kHz, was less than 0.85%. The core loss at the 50 kHz for the maximum magnetic flux density of 0.1 T reduced from 380.85 mW/cm3 to 335.23 mW/cm3. This work will encourage the further application of Fe-based AMPCs in the fields of electronics and telecommunication.

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Surface-Oxidized Amorphous Alloy Powder/Epoxy-Resin Composite Bulk Magnetic Core and Its Application to Megahertz Switching LLC Resonant Converter

Cited by 39 publications

References 5 publications

Improving Transmission Efficiency with Magnetic Coating Technology for Lightweight Wireless Power Transfer Coil Using Aluminum Plate

Improving Transmission Efficiency with Magnetic Coating Technology for Lightweight Wireless Power Transfer Coil Using Aluminum Plate

Effectiveness of Magnetic Composite Material on Copper Loss Reductions and Misalignment in Copper‐Plate‐Coils for Wireless Power Transmission

Strategy to Enhance Magnetic Properties of Fe78Si9B13 Amorphous Powder Cores in the Industrial Condition

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