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magnetic properties of soft magnetic composites prepared by gas-atomized glassy powders from a new Fe-based alloy with high glass-forming ability

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Science China(Physics,Mechanics & Astronomy) 2024年第11期Mechanics & Astronomy) .卷 95-108页

作者： Ranbin Wang Jili Jia You Wu Wenhui Guo Na Chen Yang Shao Kefu Yao School of Materials Science and Engineering Tsinghua University Wuzhen Laboratory

With a pressing need for high efficiency, low power consumption, and miniaturization of electronics, soft magnetic composites（SMCs） show great potential, especially for applications in key electronic component. However, core loss is still the focused issue for SMCs that hinders their sustainable development and widespread applications. In the present study, high-performance SMCs were fabricated by novel Fe74B7C7P7Si3Mo1Cr1powders with spherical shape and a fully glassy structure, which were successfully prepared by a gas atomization method. The microstructure and high-frequency magnetic properties of these SMCs were studied in detail. To enhance the soft ferromagnetism, the effects of annealing temperature（Ta） and powder size on their performance were clarified. Increasing Taup to 703 K not only helps to effectively release internal stress in the powders, but also improves the integrity of the insulation layer structure, which is conducive to decreasing the core loss. In addition, reducing the powder size contributes to the overall performance enhancement. Prepared from the powders with the smallest mean particle size and annealed at 703 K, the SMC exhibits optimum property combination of a stable effective permeability of 26.2 up to 1 MHz, a total core loss of 883 kW m–3（100 kHz, 100 mT）, and a DC-Bias performance of 79.3% under 100 Oe field, which is even comparable to those of the most prominent SMCs reported so far. These results are meaningful for potentially stimulating the development and application of new low-loss SMCs.

关键词： metallic glassy powder soft magnetic composite annealing temperature particle size high-frequency property

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High-frequency magnetic properties and core loss of carbonyl iron composites with easy plane-like structures

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Chinese Physics B 2021年第2期30卷 508-513页

作者： Guo-Wu Wang Chun-Sheng Guo Liang Qiao Tao Wang Fa-Shen Li Key Laboratory for Magnetism and magnetic Materials of MOE Lanzhou UniversityLanzhou 730000China Guangzhou Newlife Magnet Electricity Co. Ltd.Guangzhou 511356China Key Laboratory of Special Function Materials and Structure Design(Ministry of Education) Lanzhou UniversityLanzhou 730000China

To fully release the potential of wide bandgap(WBG)semiconductors and achieve high energy density and efficiency,a carbonyl iron soft magnetic composite(SMC)with an easy plane-like structure is *** to this structure,the permeability of the composite increases by 3 times(from 7.5 to 21.5)at 100 MHz compared with to the spherical carbonyl iron SMC,and the permeability changes little at frequencies below 100 *** addition,the natural resonance frequency of the composite shifts to higher frequencies at 1.7 *** total core losses of the composites at 10,20,and 30 m T are80.0,355.3,and 810.7 m W/cm^(3),respectively,at 500 k *** with the spherical carbonyl iron SMC,the core loss at500 k Hz is reduced by more than 60%.Therefore,this kind of soft magnetic composite with an easy plane-like structure is a good candidate for unlocking the potential of WBG semiconductors and developing the next-generation power electronics.

关键词： soft magnetic composite high frequency magnetic property power electronic core loss

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Controllable SiO2 coating layer of FeSiBPNb amorphous powder cores with excellent soft magnetic properties

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Journal of Iron and Steel Research International 2018年第6期25卷 624-629页

作者： Ke-yu Huang Ya-qiang Dong Min Liu Ji-hang Ren Shu-han Lu Zhan-kui Zhao Chun-tao Chang Xin-min Wang College of Materials Science and Engineering ChangchunUniversity of Technology Changchun 130012 Jilin China Zhejiang Province Key Laboratory of magnetic Materials andApplication Technology CAS Key Laboratory of MagneticMaterials and Devices Ningbo Institute of MaterialsTechnology and Engineering Chinese Academy of SciencesNingbo 315201 Zhejiang China

Amorphous powder cores based on spherical （Fe0.76Si0.09B0.1P0.05）99Nb1 amorphous powder and their SiO2 layer prepared by in situ coating insulation process were investigated in detAll. These cores were characterized by scanning electron microscopy and X-ray diffraction analyses, and the results revealed that the surface layer of the amorphous powder was composed of SiO2 with uniform surface coverage. The thickness of the SiO2 insulating layer could be controlled by adjusting the tetraethyl orthosilicate （TEOS） content. By cold-pressing with epoxy resin under a pressure of 1800 MPa, a ring powder core with an outer diameter of 20.3 ram, inner diameter of 12.7 mm, and height of 5.3 mm was prepared. The FeSiBPNb composite core showed its best properties when the TEOS content was 2 mL/g （the volume of TEOS for each gram of （Fe0.76Si0.09B0.1P0.05）99Nb1 amorphous powder, mL/g）, which showed good relative permeability in the high-frequency range of up to 10 MHz and a low core loss of 320 W/kg under the maximum magnetic flux density of 0.1 T and frequency of 100 kHz.

关键词： soft magnetic composite Core loss Relative permeability In situ chemical deposition Amorphous powder

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Performance Analysis of a PM Claw Pole SMC Motor with Brushless DC Control Scheme

Performance Analysis of a PM Claw Pole SMC Motor with Brushl...

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CES/IEEE 5th International Power Electronics and Motion Control Conference

作者： Youguang Guo Jianguo Zhu Jiaxin Chen and Jianxun Jin Faculty of Engineering University of Technology Sydney P.O. Box 123 Broadway NSW 2007 Australia College of Electromechanical Engineering Donghua University Shanghai 200051 China School of Automation Engineering U. of Electronic Sci. & Tech. of China Chengdu Sichuan 610054 China

＜正＞Thanks to its unique properties, such as isotropic magnetic and thermal properties and low eddy current loss, the soft magnetic composite （SMC） material is suitable for application in electrical machines, especially those with complex structures and three-dimensional （3D） magnetic fluxes. This paper presents the performance analysis of a three-stack permanent magnet （PM） claw pole motor with an SMC stator core. 3D finite element magnetic analysis and improved formulations are applied to accurately compute the motor parameters, such as the back electromotive force, incremental inductance, cogging torque, and core loss. An equivalent electrical circuit is derived to predict the motor’s steady-state performance under a brushless DC control scheme. Because of the large winding inductance of this type of motors, the control of the output torque and speed can be difficult. To verify the motor controllability, a Matlab/Simulink-based simulation model is compiled to simulate the motor dynamic and steady-state performances. Experiments are conducted on the motor prototype, validating the theoretical computations and analyses.

关键词： soft magnetic composite claw pole motor brushless DC control finite element magnetic field analysis performance simulation

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