Predicting Magnetic Remanence of NdFeB Magnets from Composition

2021 ◽  
Author(s):  
Yun Zhang ◽  
Xiaojie Xu
Keyword(s):  
Ndfeb Magnets ◽  
Magnetic Remanence

Magnetic Remanence Prediction of NdFeB Magnets Based on a Novel Machine Learning Intelligence Approach Using a Particle Swarm Optimization Support Vector Regression

2014 ◽  
Vol 6 (4) ◽  
pp. 72-81 ◽  
Author(s):  
WenDe Cheng
Keyword(s):  
Magnetic Properties ◽  
Particle Swarm Optimization ◽  
Support Vector Regression ◽  
Particle Swarm ◽  
Support Vector ◽  
Chemical Compositions ◽  
Swarm Optimization ◽  
Ndfeb Magnets ◽  
Magnetic Remanence ◽  
The Mean

Studies have shown that the chemical compositions affecting the magnetic properties of NdFeB magnets. In order to get the right NdFeB magnets, it is advantageous to have an accurate model with which one can predict the magnetic properties with different components. In this paper, according to an experimental dataset on the magnetic remanence of NdFeB, a predicting and optimizing model using support vector regression (SVR) combined with particle swarm optimization (PSO) was developed. The estimated result of SVR agreed with the experimental data well. Test results of leave-one-out cross validation show that the mean absolute error does not exceed 0.0036, the mean absolute percentage error is solely 0.53%, and the correlation coefficient () is as high as 0.839. This implies that one can estimate an available combination of different proportion components by using support vector regression model to get suitable magnetic remanence of NdFeB.

scholarly journals Efek Air Gap pada Rancang Bangun dan Uji Performa Generator Listrik Fluks Aksial Berbasis Magnet Permanen NdFeB

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Ahmad Maulana
Keyword(s):  
Performance Analysis ◽  
Permanent Magnet ◽  
Rotational Speed ◽  
Output Voltage ◽  
Permanent Magnets ◽  
Air Gap ◽  
Axial Flux ◽  
Ndfeb Magnets ◽  
Magnetic Remanence ◽  
Electrical Generator

Abstrak:Dalam penelitian ini telah dianalisis efek air gap terhadap performa generator listrik tipe fluks aksial berbasismagnet permanen NdFeB. Analisis performa dilakukan dengan mengukur output tegangan generator listrik fluks aksialterhadap ukuran air gap dan kecepatan putar rotor. Air gap antara stator dan rotor divariasikan dari 7 sampai 20 mm. Darihasil eksperimen, peningkatan remanansi magnet berbanding lurus terhadap peningkatan output tegangan. Sebaliknya,peningkatan ukuran air gap menurunkan tegangan output secara linier. Hal ini disebabkan oleh adanya penurunan magnetikflux density secara exponensial. Pada ukuran air gap 7 mm dan kecepatan rotor 1500 rpm, dihasilkan output teganganmaksimal untuk Br = 0,2 dan 1,3 Tesla berturut-turut sebesar 10,4 dan 67,7 volt.Kata Kunci: air gap, generator listrik fluks aksial, ouput tegangan, magnet NdFeBAbstract:In this paper, the effect of air gap to the performance of NdFeB based permanent magnet axial flux electricalgenerator have been analyzed. The performance analysis was performed by measuring the ouput potential of generator asthe changing of air gap and rotational speed of rotor. The air gap was varied from 7 to 20 mm. Based on the experiment, theincreasing of magnetic remanence of permanent magnets was linearly corelated to the increasing of output voltage. On theother hand, increasing of the air gap was linearly reduced the ouput voltage. This effect is caused by the decreasing ofmagnetic flux densityexponentially. On the fixed air gap of 7 mm androtational speed of 1500 rpm, the maximum ouputvoltage is achived for Br = 0.2 and 1.3 Tesla  with the value of 10.4 and 67.7 volt, respectively.Keywords: air gap, axial flux electrical generator, ouput voltage, NdFeB magnets

MAGNETIZATION PROCESSES IN MELT SPUN NdFeB-MAGNETS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-655-C8-656 ◽  
Author(s):  
A. Handstein ◽  
J. Schneider ◽  
U. Heinecke ◽  
R. Grössinger ◽  
H. Sassik
Keyword(s):  
Ndfeb Magnets ◽  
Melt Spun ◽  
Magnetization Processes

Selective and efficient extraction of Nd from NdFeB magnets via ionization in LiCl-KCl-CdCl2 melt

2021 ◽  
Vol 860 ◽  
pp. 158424
Author(s):  
Younghwan Jeon ◽  
Jungho Hur ◽  
Gwan Yoon Jeong ◽  
Sungjune Sohn ◽  
Jaeyeong Park
Keyword(s):  
Ndfeb Magnets ◽  
Efficient Extraction

scholarly journals Novel Polyimide/Copper-Nickel Ferrite Composites with Tunable Magnetic and Dielectric Properties

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1646
Author(s):  
Corneliu Hamciuc ◽  
Mihai Asandulesa ◽  
Elena Hamciuc ◽  
Tiberiu Roman ◽  
Marius Andrei Olariu ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Nickel Ferrite ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Broadband Dielectric Spectroscopy ◽  
Copper Nickel ◽  
Low Dielectric ◽  
Magnetic Remanence ◽  
Polyimide Matrix ◽  
Ferrite Composites

Heat-resistant magnetic polymer composites were prepared by incorporating cerium-doped copper-nickel ferrite particles, having the general formula Ni1-xCuxFe1.92Ce0.08O4 (x: 0.0, 0.3, 0.6, 1.0), into a polyimide matrix. The effects of particle type and concentration on the thermal, magnetic, and electrical properties of the resulting composites were investigated. The samples were characterized by FTIR, scanning electron microscopy, X-ray diffractometry, thermogravimetric analysis, differential scanning calorimetry, vibrating sample magnetometer, and broadband dielectric spectroscopy. The composites exhibited high thermal stability, having initial decomposition temperatures between 495 and 509 °C. Saturation magnetization (Ms), magnetic remanence (Mr), and coercivity (Hc) were found in range of 2.37–10.90 emu g−1, 0.45–2.84 emu g−1, and 32–244 Oe, respectively. The study of dielectric properties revealed dielectric constant values of 3.0–4.3 and low dielectric losses of 0.016–0.197 at room temperature and a frequency of 1 Hz.

Corrosion resistance of NdFeB magnets coated by Al

1996 ◽  
Vol 32 (5) ◽  
pp. 4407-4409 ◽  
Author(s):  
N.C. Ku ◽  
C.-D. Qin ◽  
C.C. Yu ◽  
D.H.L. Ng
Keyword(s):  
Corrosion Resistance ◽  
Ndfeb Magnets

NdFeB magnets with zero temperature coefficient of induction

1986 ◽  
Vol 22 (5) ◽  
pp. 1081-1083 ◽  
Author(s):  
Bao-Min Ma ◽  
K. Narasimhan ◽  
J. Hurt
Keyword(s):  
Temperature Coefficient ◽  
Zero Temperature ◽  
Ndfeb Magnets ◽  
Temperature Coefficient Of Induction

Coercivity and Thermal Stability Enhancement for Spark-Plasma-Sintered Nanocrystalline NdFeB Magnets With Dy2O3 and Zn Additions

2015 ◽  
Vol 51 (11) ◽  
pp. 1-4
Author(s):  
Z. W. Liu ◽  
L. Z. Zhao ◽  
S. L. Hu ◽  
H. Y. Yu ◽  
X. C. Zhong ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ndfeb Magnets ◽  
Spark Plasma ◽  
Stability Enhancement
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