• Title, Summary, Keyword: soft magnetic composite (SMC)

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High-strength Soft Magnetic Composite with Self-lubricating Resin

  • Miyahara, Masahisa;Tanaka, Yoshihiro;Igarashi, Kazunori;Morimoto, Koichiro
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • pp.1173-1174
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    • 2006
  • Improvement of the strength is one of the most important subjects on soft magnetic composite (SMC) to increase the applica ble items. In this study, lubricants for inner lubricating SMC, which can be produced in lower cost than die wall-lubricatin g SMC, varied to investigate their effect on the strength. The newly developed SMC with self-lubricating resin shows high st rength equivalent to that of SMC obtained by die wall lubrication.

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Strategic Utilization of Soft Magnetic Composite in a High-Speed Switched Reluctance Machine Depending on a Loss Pattern (손실 패턴에 따른 고속 스위치드 릴럭턴스 전동기의 SMC 분말을 이용한 효율 개선)

  • Lee, Cheewoo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.2
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    • pp.323-327
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    • 2017
  • Soft magnetic composite (SMC) material has recently received a significant attention in the area of high-speed machines because of its unique properties such as good design flexibility and low eddy current loss. However, SMC's electromagnetic property is poor compared to silicon steel in terms of saturation, relative permeability, and hysteresis loss. This paper presents a technique for utilization of SMC in two strategic designs of a switched reluctance machine (SRM) depending on a loss pattern. To investigate the effect of SMC's merits and demerits, the stator material is changed from laminated steel to SMC.

Design of New Type Universal Motor Using Soft Magnetic Composites

  • Kim Byung-Taek
    • Journal of Electrical Engineering and Technology
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    • v.1 no.2
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    • pp.211-215
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    • 2006
  • This paper presents a new structure for the universal motor using soft magnetic composite (SMC). The stator for this new type of motor is made by combination of the SMC pole and the silicon steel yoke. The shape of the 3D SMC pole is designed to minimize ohmic loss and amount of stator coil. To design the pole shape, the 3D analysis in the design procedure is replaced with an equivalent 2D analysis. Finally, the optimal shape is analyzed by 3D FEM and the performance is discussed.

Iron Loss Comparison between Soft Magnetic Composite Core and Laminated Steel Core in Axial Flux Machine (축방향 자속형 전동기에서 연자성복합체 코어와 적층 전기강판 코어의 철손 비교)

  • Lee, Minhyeok;Nam, Kwanghee
    • Proceedings of the KIPE Conference
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    • pp.217-218
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    • 2015
  • Two axial flux permanent magnet (AFPM) machines using soft magnetic composite (SMC) and lamination steel are studied. Generally stator cores of AFPM machines are manufactured using SMC because AFPM machines need 3 dimensional core structures. However, SMC cores have very disadvantages in magnetic properties. Especially permeability value is much lower than that of lamination steel, so magnetic field density is also lower. In terms of core losses, SMC cores have much larger loss values than lamination steel cores because SMC core can't be laminated. In this study, AFPM machine was designed using laminated steel, and iron losses in two machines using SMC and laminated steel were studied. Simulations were carried out by a commercial 3-D FEM tool.

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BLDC Motor Design for Vacuum Cleaner Using Soft Magnetic Composite (연자성 철심재질을 이용한 진공 청소기용 BLDC 전동기 설계)

  • Lee, Kyu-Seok;Cha, Hyun-Rok;Yun, Cheol-Ho;Jung, Tae-Uk
    • Proceedings of the KIEE Conference
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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.

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Test Results of SMC Cores as Some Types of Motor Cores

  • Asaka, Kazuo;Ishihara, Chio;Enomoto, Yuuji;Ito, Motoya
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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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.

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Design of a High Speed Switched Reluctance Motor with Soft Magnetic Composite Core (연자성 분말을 이용한 고속 스위치드 릴럭턴스 전동기 설계)

  • Hwang, Hongsik;Lee, Cheewoo
    • Proceedings of the KIEE Conference
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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.

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Properties of Soft Magnetic Composite with Evaporated MgO Insulation Coating for Low Iron Loss

  • Uozumi, Gakuji;Watanabe, Muneaki;Nakayama, Rryoji;Igarashi, Kazunori;Morimoto, Koichiro
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • pp.1288-1289
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    • 2006
  • Innovative SMC with low iron loss was made from iron powders with evaporated MgO insulation coating. The coating had greater heat-resistance than conventional phosphatic insulation coating, which enabled stress relieving annealing at higher temperature. Magnetic properties of toroidal samples (OD35mm,ID25mm, t5) were examined. The iron loss at 50Hz for Bm = 1.5T was lower 50% of conventional SMC and was almost the same with silicon iron laminations(t0.35). It became clear that MgO insulation coating has enough heat resistance and adhesiveness to powdersurface to obtain innovative SMC with low iron loss.

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Influence of Machining on Magnetic Properties of Soft Magnetic Composites

  • Igarashi, Kazunori;Miyahara, Masahisa;Morimoto, Koichiro
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • pp.1175-1176
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    • 2006
  • Influences of machining on magnetic properties of soft magnetic composites (SMC's) with addition of two kinds of binder, i.e., organic binder and inorganic one, were investigated. Machining does not affect DC magnetic properties of the SMC compacts. This can be ascribed to their particular structure in which the ironpowder particles are highly isolated by the binder. On the other hand, decrease in resistivity and resultant increase in eddy current loss was confirmed in the machined compacts containing inorganic binder. It is supposed that the brittleadditive binder existing between the iron particles is partly broken, and iron-to-iron contact is formed on the machined surface.

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Design and Analysis for Loss Reduction of High-Speed Permanent Magnet Motor using a Soft Magnetic Composite

  • Lee, Sung-Ho;Kim, Yong-Jae;Lee, Kyu-Seok;Kim, Sung-Jin
    • Journal of Magnetics
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    • v.20 no.4
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    • pp.444-449
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    • 2015
  • Soft magnetic composites (SMCs) are especially suitable for the construction of low-cost, high-performance motors with 3-D magnetic fields. The main advantages of SMCs is that the iron particles are insulated by the surface coating and adhesive used for composite bonding, the eddy-current loss is much lower than that in laminated steels, especially at higher frequencies, and the hysteresis loss becomes the dominant component of core losses. These properties enable machines to operate at higher frequencies, resulting in reduced machine size and weight. In this paper, 3-D topologies are proposed that enable the application of SMCs to effectively reduce losses in high-speed permanent magnet (PM) motors. In addition, the electromagnetic field characteristics of the motor topologies are evaluated and compared using a non-linear finite element method (FEM) based on 3-D numerical analysis, and the feasibility of the motor designs is validated.