scholarly journals AC Magnetic Loss Reduction of SLM Processed Fe-Si for Additive Manufacturing of Electrical Machines

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1241
Author(s):  
Hans Tiismus ◽  
Ants Kallaste ◽  
Anouar Belahcen ◽  
Marek Tarraste ◽  
Toomas Vaimann ◽  
...  
Keyword(s):  
Magnetic Measurements ◽  
Magnetic Loss ◽  
Core Loss ◽  
Soft Magnetic Materials ◽  
Loss Reduction ◽  
Soft Magnetic ◽  
Cross Sectional ◽  
Air Gaps ◽  
Advantages And Disadvantages ◽  
Core Losses

Additively manufactured soft magnetic Fe-3.7%w.t.Si toroidal samples with solid and novel partitioned cross-sectional geometries are characterized through magnetic measurements. This study focuses on the effect of air gaps and annealing temperature on AC core losses at the 50 Hz frequency. In addition, DC electromagnetic material properties are presented, showing comparable results to conventional and other 3D-printed, high-grade, soft magnetic materials. The magnetization of 1.5 T was achieved at 1800 A/m, exhibiting a maximum relative permeability of 28,900 and hysteresis losses of 0.61 (1 T) and 1.7 (1.5 T) W/kg. A clear trend of total core loss reduction at 50 Hz was observed in relation to the segregation of the specimen cross-sectional topology. The lowest 50 Hz total core losses were measured for the toroidal specimen with four internal air gaps annealed at 1200 °C, exhibiting a total core loss of 1.2 (1 T) and 5.5 (1.5 T) W/kg. This is equal to an 860% total core loss reduction at 1 T and a 510% loss reduction at 1.5 T magnetization compared to solid bulk-printed material. Based on the findings, the advantages and disadvantages of printed air-gapped material internal structures are discussed in detail.

Core loss reduction for Fe-6.5wt%Si soft magnetic composites doped with Co element

2020 ◽  
Vol 502 ◽  
pp. 166553 ◽  
Author(s):  
Jian Wang ◽  
Xin Liu ◽  
Chao Lei ◽  
Xinhua Mao ◽  
Danhua Liu ◽  
...  
Keyword(s):  
Core Loss ◽  
Loss Reduction ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Soft Magnetic Composites

Magnetic and Electrical Properties of Iron-Based Soft Magnetic Composites with Silicone Resin Insulation Coating

2016 ◽  
Vol 723 ◽  
pp. 80-88
Author(s):  
Fa Chang Li ◽  
Yi Li ◽  
Xue Quan Liu ◽  
Jin Pu Li ◽  
Nan Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrical Properties ◽  
Magnetic Measurements ◽  
Magnetic Loss ◽  
Silicone Resin ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Distribution Maps ◽  
Soft Magnetic Composites ◽  
Magnetic And Electrical Properties

This paper investigates the magnetic and electrical properties of iron silicone resin soft magnetic composites. Scanning electron microscopy, energy dispersive X-ray spectroscopy analysis, distribution maps and density measurements confirm that the particles surface layer contains a thin layer of silicone resin with complete coverage of powders surface. The thickness of silicone resin film is averagely 120nm according to the results of transmission electron microscopy. Magnetic measurements show that the silicone resin insulation has a greater heat resistance than the conventional phosphate insulation, which enables stress reliving during annealing at higher temperature (600°C) without a large increase in magnetic loss. The results of annealing at 600°C show that the electrical resistivity increased from 8μΩ·m for SOMALOYTM samples to 55μΩ·m for the silicone insulated composites produced in this work.

scholarly journals Advances in Powder Metallurgy Soft Magnetic Composite Materials

2017 ◽  
Vol 62 (2) ◽  
pp. 1149-1154 ◽  
Author(s):  
R. Bureš ◽  
M. Strečková ◽  
M. Fáberová ◽  
P. Kollár ◽  
J. Füzer
Keyword(s):  
Powder Metallurgy ◽  
Magnetic Materials ◽  
Automotive Industry ◽  
Core Loss ◽  
Soft Magnetic Materials ◽  
Magnetic Composite ◽  
Transportation Industry ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
High Frequency Region

Abstract Powder metallurgy has grown with the expansion of various industry. Automotive industry had the most strong influence. Today, more than 90% of PM products are used in the transportation industry. Development of new materials such as magnetic materials is expected to meet the new trends of automotive industry, electric and hybrid vehicles. Soft magnetic composites (SMC) are PM materials based on ferromagnetic powder particles covered by electric insulation layer. Concept of SMC’s and PM technologies offer possibility to become faster, use higher frequencies, become smaller and denser, save more energy, achieving high permeability and lower core loss in high frequency region, which is required for soft magnetic materials. Investigation of correlations among compaction parameters, inner structure, magnetic and mechanical properties are presented.

Nanocrystalline Soft Magnetic Alloys for Space Applications

2004 ◽  
Vol 851 ◽  
Author(s):  
Matthew A. Willard ◽  
Thomas Francavilla ◽  
Ramasis Goswami ◽  
Vincent G. Harris
Keyword(s):  
Aging Time ◽  
Room Temperature ◽  
Core Loss ◽  
Nanocrystalline Alloy ◽  
Soft Magnetic ◽  
Space Applications ◽  
Soft Magnetic Alloys ◽  
Maximum Induction ◽  
Core Losses

ABSTRACTThis study focuses on a Co-based nanocrystalline alloy (Co84.55Fe4.45Zr7B4) with potential for long-term high temperature use. As an indication of their performance, core losses were measured on toroidal samples using a Walker AC permeameter over a frequency range of 0.1 to 500 kHz, at induction amplitudes of 100, 300, and 500 mT, and temperatures from 22 to 300°C. For a given frequency and maximum induction amplitude, the losses were invariant as a function of measurement temperature. Vibrating sample magnetometry provided the magnetization and hysteretic losses as a function of temperature. As the temperature of the alloy was raised to 300°C from room temperature, the saturation magnetization (120 emu/g)was reduced by less than 15%. A toroid was aged at 300°C for up to 300 hours and core loss measured as a function of aging time at the previously mentioned frequencies and induction amplitudes. The losses were invariant over the aging time.

Fe/SiO2 Nanocomposite Soft Magnetic Materials

2001 ◽  
Vol 703 ◽  
Author(s):  
S. Hui ◽  
Y. D. Zhang ◽  
T. D. Xiao ◽  
Mingzhong Wu ◽  
Shihui Ge ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Materials ◽  
Annealing Temperature ◽  
Magnetic Measurements ◽  
Soft Magnetic Materials ◽  
Crystallographic Structure ◽  
Ferromagnetic Behavior ◽  
Soft Magnetic ◽  
Synthesis Conditions ◽  
Optimum Synthesis

ABSTRACTIn an effort to explore new highly resistive soft magnetic materials, Fe/SiO2 nanocomposite materials have been synthesized using a wet chemical reaction approach in which the precursor complex was annealed at various temperatures. The crystallographic structure, nanostructure, morphology, and magnetic properties of the synthetic Fe/SiO2 particles were studied by x-ray diffraction, transmission electron microscopy, and magnetic measurements. The experimental results show that for this approach, the [.alpha]-Fe particles are coated with amorphous silica. The progress of the reaction, the purity of Fe/SiO2 in the synthetic powder, and the Fe particle size are highly dependent on the annealing temperature. By adjusting the annealing temperature, the particle size can be controlled from approximately 20 nm to 70 nm. For the synthetic nanopowder obtained by H2 reduction at 400 °C, there exists a superparamagnetic behavior below room temperature; while for the nanopowders obtained by reduction at higher temperatures, the ferromagnetic behavior is dominant. Based on these studies, optimum synthesis conditions for Fe/SiO2 nanocomposites is determined.

scholarly journals Measurement and Modeling of Rotational Core Losses of Soft Magnetic Materials Used in Electrical Machines: A Review

2008 ◽  
Vol 44 (2) ◽  
pp. 279-291 ◽  
Author(s):  
Youguang Guo ◽  
Jian Guo Zhu ◽  
Jinjiang Zhong ◽  
Haiyan Lu ◽  
Jian Xun Jin
Keyword(s):  
Magnetic Materials ◽  
Electrical Machines ◽  
Soft Magnetic Materials ◽  
Soft Magnetic ◽  
Core Losses ◽  
Materials Used

scholarly journals Estimation of Energy Losses in Nanocrystalline FINEMET Alloys Working at High Frequency

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7745
Author(s):  
Lucian-Gabriel Petrescu ◽  
Maria-Catalina Petrescu ◽  
Emil Cazacu ◽  
Catalin-Daniel Constantinescu
Keyword(s):  
High Frequency ◽  
Core Loss ◽  
Magnetic Core ◽  
Soft Magnetic Materials ◽  
Magnetic Flux Density ◽  
Nominal Composition ◽  
Magnetic Alloy ◽  
Soft Magnetic ◽  
Soft Magnetic Alloy ◽  
Electromagnetic Devices

Soft magnetic materials are at the core of electromagnetic devices. Planar transformers are essential pieces of equipment working at high frequency. Usually, their magnetic core is made of various types of ferrites or iron-based alloys. An upcoming alternative might be the replacement the ferrites with FINEMET-type alloys, of nominal composition of Fe73.5Si13.5B9Cu3Nb1 (at. %). FINEMET is a nanocrystalline material exhibiting excellent magnetic properties at high frequencies, a soft magnetic alloy that has been in the focus of interest in the last years thanks to its high saturation magnetization, high permeability, and low core loss. Here, we present and discuss the measured and modelled properties of this material. Owing to the limits of the experimental set-up, an estimate of the total magnetic losses within this magnetic material is made, for values greater than the measurement limits of the magnetic flux density and frequency, with reasonable results for potential applications of FINMET-type alloys and thin films in high frequency planar transformer cores.

Improvement of Super Low Core-Loss Soft Magnetic Materials

2007 ◽  
Vol 534-536 ◽  
pp. 1325-1328 ◽  
Author(s):  
Toru Maeda ◽  
Atsushi Sato ◽  
Yasushi Mochida ◽  
Haruhisa Toyoda ◽  
Koji Mimura ◽  
...  
Keyword(s):  
Magnetic Material ◽  
Surface Morphology ◽  
Rupture Strength ◽  
Core Loss ◽  
High Strength ◽  
Soft Magnetic Materials ◽  
Spherical Particles ◽  
Binder System ◽  
Soft Magnetic ◽  
Steel Sheets

In the previous work, we reported a P/M soft magnetic material with super low core loss value of W10/1k = 68 W/kg which is lower than that of 0.35mm-thick flat rolled soft magnetic laminated steel sheets. But this material lack of strength characteristics due to spherical particles produced by a gas-atomizing method. That is, the value of transverse rupture strength (TRS) was only 20MPa when a non-hygroscopicity resin was used as binder. In order to achieve both low core loss and high strength, the iron powder (shape, surface morphology) and binder strength was improved, and we were able to obtain a material with TRS of 80 MPa and core loss (W10/1k) of 108 W/kg of. Furthermore, by using this binder system, we were able to obtain a TRS of over 50MPa for the material with spherical particles (W10/1k = 81 W/kg).

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