• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.914-915
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• 2015

본 논문은 고속 전동기의 효율 개선을 위한 재료로서 많은 관심을 받고 있는 연자성 분말(Soft Magnetic Composite, SMC)을 적용한 고속 2상 4/2 스위치드 릴럭턴스 전동기 설계 및 SMC 재질이 효율 특성에 미치는 영향 분석에 대한 연구이다. 고속 전동기의 효율 개선을 위한 재료로써 많은 관심을 받고 있는 SMC는 자계적으로 등방성을 띠며, 절연 코팅이 되어 있는 철 분말들로 구성되어 있어 높은 주파수에서 전기 강판 대비 높은 전기 저항으로 와전류 손실을 최소화 할 수 있으며 분말을 압분하여 형상을 만들기 때문에 자유로운 3차원 설계 및 제작이 용이하고 제조 시 재료 소비의 절감과 재활용이 가능한 장점이 있다. 그러나 전기 강판 대비 낮은 비투자율, 낮은 기계적 강도, 저주파 대역에서 높은 철손 특성의 단점을 가지고 있어 SMC를 이용한 전자계 구조 설계 시 낮은 비투자율 특성과 뛰어난 와전류 손실 저감 특성 사이의 균형을 고려할 필요가 있다. 따라서 본 논문에서는 전기 강판을 사용하는 일반적인 2상 4/2 스위치드 릴럭턴스 전동기와의 비교를 통해 SMC 재질 적용이 정적 토크 및 효율 특성에 미치는 영향을 비교분석하여 설계를 진행하였다.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.795-796
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• 2006

본 논문은 청소기용 BLDC 전동기 모터에 기존의 전기강관이 아닌 SMC(Soft Magnetic Composite)를 적용하여 진공청소기용 BLDC 전동기 모터 설계를 하는데 있다. 본 논문에서 사용한 SMC는 순철 분말에 전기적 절연 코팅을 실시한 새로운 재질로 현재 많은 연구가 진행 되고 있는 분야이다. 그러나 재질의 특성에 적합한 모터 설계에 관한 연구는 미진 하였다. 따라서 본 연구는 진공청소기용으로 많이 사용되는 BLDC 모터에 SMC를 적용 하였을 때 BLDC 전동기의 특성을 알아 보고자 하였다. 본 연구에서 SMC재질을 사용 할 때는 어느 조건에서 사용함이 유리한지 알 수 있었다. 또한 고속 청소기에 적합한 설계를 실시한 결과 SMC 재질의 낮은 투자율로 말미암아 인덕턴스가 감소하고, 전류가 높아져, 출력 증대 되는 것으로 나타 났다. 향 후 본 연구는 SMC를 이용한 BLDC 모터 설계 시 설계 기준으로 이용 될 수 있을 것으로 사료된다.

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09b
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• pp.796-797
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• 2006

SMC(Soft Magnetic Composite) materials which we have newly developed were studied for their applying effects. It shows almost the same motor output power as the laminated Si-steels of 0.35mm in thickness, although core loss of SMC is about 1.5 times that of the laminations. As shown in the results, the SMC motor core is sufficient for real use as a motor core. Furthermore, a 3-D shaped motor core made of SMC can improve approximately 20% of the output compared with the same size motor made of laminations.

• Proceedings of the Korean Magnestics Society Conference
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• 2017.05a
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• pp.149-149
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• 2017

• Proceedings of the Korean Magnestics Society Conference
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• 2011.06a
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• pp.93-95
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• 2011

In this study we tried to measure the effect of magnetic field on the dielectric properties of $BaTiO_3-MgFe_2O_4$ soft magnetic composite. Composites with different weight percents of ferroelectric and ferromagnetic phases were subjected to magnetic field in the order of 0 to 450 Oe and the variation of the dielectric properties was observed. The Variation of dielectric polarization was discussed in terms of Maxwell-Wagner type polarization in particulate composites.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.30 no.12
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• pp.751-756
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• 2017

A molding-type power inductor is an inductor that uses a hybrid material that is prepared by mixing a ferrite metal powder coated with an insulating layer and an epoxy resin, which is injected into a coil-embedded mold and heated and cured. The fabrication of molding-type inductors requires various techniques such as for coil formation and insertion, improving the magnetic properties of soft magnetic metal powder, coating an insulating film on the magnetic powder surface, and increasing the packing density by well dispersing the powder in the epoxy resin. Among these aspects, researches on additives that can disperse the metal soft magnetic powder having the greatest performance in the epoxy resin with high charge have not been reported yet. In this study, we investigated the effect of silanes, KBM-303 and KBM-403, and a commercial dispersant on the dispersion of metal soft magnetic powders in epoxy resin. The sedimentation height and viscosity were measured, and it was confirmed that the silane KBM-303 was suitable for dispersion. For this silane, the packing density was as high as about 72.49%. Moreover, when 1.2 wt% of dispersant BYK-103 was added, the packing density was about 80.5%.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.4
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• pp.607-616
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• 2022

A new axial flux permanent magnet machine with soft magnetic composited cores is proposed for electric vehicle application in this paper. The windings and soft magnetic composited cores can be designed to form a very compact structure, and; thus, the torque density can be improved greatly. To obtain the a good flux concentrating ability, two toroidally wound internal stator machines are designed and analyzed, and the designed motor is with NdFeB magnet for high-performance electric vehicle application. The 3-D finite-element method is used to analyze the electromagnetic parameter and performance, for performance comparison, a commercial axial flux permanent magnet machine is used. The proposed motor reduced weight about 5.8%, produced torque higher than about 8Nm for existing motor.

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09b
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• pp.1169-1170
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• 2006

We made a high-speed motor and a DC brush-less motor for factory automation (FA) to investigate applicability of powder magnetic core to motor application, and compared those performances with the similar motors having conventional electro magnetic steel core. Permeability and saturated magnetization of powder magnetic core are less than those of elect romagnetic steel core, however output performances of each core motor are almost the same. The FA motor with powder magnetic core using three-dimensional magnetic circuit showed higher torque than the same volume motor with electromag netic steel core.

• Journal of the Korean Magnetics Society
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• v.27 no.4
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• pp.135-139
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• 2017

The magneto-impedance effect (MI effect) has been investigated in metal core/soft magnetic shell composite wires fabricated by electrodeposition of $Ni_{80}Fe_{20}$ on Cu wire (diameter $190{\mu}m$). The diagonal impedances $Z_{zz}$ and $Z_{{\theta}{\theta}}$ in cylindrical coordinate showed strong MI effect for the magnetic field applied along z-axis, while the off-diagonal impedance $Z_{{\theta}z}$ showed very weak MI effect. We have tried to develop the Cu $core/Ni_{80}Fe_{20}$ shell composite wire having strong MI effect in off-diagonal impedance by electrodeposion under torsional strain. The core/shell composite wire electrodeposited under torsional angles above $270^{\circ}$ showed significantly enhanced MI effect in the off-diagonal impedance. The maximum MI effect was observed in the composite wire electrodeposited under torsional angle of $360^{\circ}$. The developed method to enhance off-diagonal MI effect is expected to increase the applicability of the core/shell composite wire to magnetic sensor material.

• Proceedings of the Korean Magnestics Society Conference
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• 2015.11a
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• pp.94-94
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• 2015