scholarly journals The Theoretical Magnetization Hysteresis Curve of Nd-Fe-B Anisotropic Bonded Magnets

2011 ◽  
Vol 21 (3) ◽  
pp. 272
Author(s):  
Nguyen Van Khanh ◽  
Nguyen Van Vuong
Keyword(s):  
Magnetic Field ◽  
Magnetic Particles ◽  
Random Number ◽  
Effective Interaction ◽  
Random Number Generation ◽  
Hysteresis Curve ◽  
Generation Technique ◽  
Magnetization Hysteresis ◽  
Gaussian Statistics ◽  
Bonded Magnet

The theoretical magnetization hysteresis curve of Nd-Fe-B anisotropic bonded magnets is simulated using Jiles-Atherton model and random number generation technique. Gaussian statistics was used to assign magnetic particles to random values of magnetic field (H$_{ai}$) and effective interaction ($\alpha )$ parameters. The prospect of anisotropic bonded magnet is evaluated and discussed.

scholarly journals Study on the Production of Bonded Magnet NdFeB and Polyvinyl Butyral

2020 ◽  
Vol 2 (1) ◽  
pp. 25-33
Author(s):  
Mareanus Mendrofa ◽  
Perdinan Sinuhaji ◽  
Muljadi Muljadi
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Polyvinyl Butyral ◽  
Curing Temperature ◽  
Hysteresis Curve ◽  
Molding Method ◽  
Bonded Magnet ◽  
The Magnetic Field ◽  
Glass Beaker

bonded magnet is composite magnet material made by mixing magnetic powder with non-magnetic binder. The process in manufacturing bonded magnet NdFeB made by mixing powder of neodymium iron boron (NdFeB) commercial type MQP-B with a polyvinyl butyral powder using a glass beaker. The comparisons of variation in composing NdFeB magnets powders with a binder of PVB (% weight) are 98:2, 96:4, 94:6 and 93:7 of 8 grams from total mass of the sample. After mixing the powder, it is molded by using a compression molding method with 8 tons pressure for 20 minutes at curing temperature 1600C. The molded samples are conducted by characterizing the physical properties which include measurement of density, microstructure analysis using SEM-EDX and magnetic properties which include measurement of the magnetic field strength using a Gaussmeter and hysteresis curve using VSM. The result of the study shows that the addition of and binder PVB in bonded magnet NdFeB causes a decrease in the density and magnetic field strength. The best result of density and magnetic field in the manufacture of bonded magnets is obtained by the addition of 2 % binder of 5.66 g/cm3 and strong magnetic field of 1862.4 G. the score of Mr = 72.86 emu/g, Ms = 103 emu/gram, Hc = 8.490 KOe and BHmax = 5.1 MGOe was obtained on the addition of PVB 2 %.

MAGNETIC INTERACTION OF THE COMPOSITE MIXTURES Nd-Fe-B/Sm2Co17

2006 ◽  
Vol 20 (24) ◽  
pp. 1543-1548 ◽  
Author(s):  
SHUXIN BAI ◽  
SHUN LI ◽  
HONG ZHANG ◽  
KE CHEN ◽  
HONGNIAN CAI
Keyword(s):  
Magnetic Field ◽  
Phase Behavior ◽  
Mass Fraction ◽  
Magnetic Particles ◽  
Single Phase ◽  
Magnetic Interaction ◽  
Demagnetization Curve ◽  
Energy Product ◽  
Bonded Magnet ◽  
Low Magnetic Field

Hybrid-bonded isotropic Nd-Fe-B /anisotropic Sm 2 Co 17 magnets with different mass fraction of Sm 2 Co 17 powders had been analyzed with the aid of magnetization and demagnetization curves. It was found that the Henkel plot of magnet with 10 wt.% Sm 2 Co 17 lies above the Wohlfarth line at low magnetic field but goes down slowly and then lies below the Wohlfarth line at high magnetic field. This shows magnetizing interaction at first and demagnetizing interaction at last, and presents an s-shaped behavior that has been seen frequently in nanocomposite exchange-coupled magnets. The demagnetization curve of 10 wt.% Sm 2 Co 17 content hybrid-bonded magnet exhibits a magnetically single phase behavior which has also been seen frequently in nanocomposite exchange-coupled magnets, indicating complex magnetic interaction between these two magnetic particles. As a result, a small increase in remanence and energy product are observed in hybrid-bonded Nd-Fe-B/Sm 2 Co 17 magnets with 10% mass fraction of Sm 2 Co 17.

HEATING RATE PREDICTION FOR INDUCTION WELDING MAGNETIC SUSCEPTORS

2021 ◽  
Author(s):  
ROMAIN G. MARTIN ◽  
CHRISTER JOHANSSON ◽  
JASON R. TAVARES ◽  
MARTINE DUBÉ
Keyword(s):  
Magnetic Field ◽  
Heating Rate ◽  
Surface Area ◽  
Magnetic Particles ◽  
Eddy Currents ◽  
Field Amplitude ◽  
Hysteresis Curve ◽  
Heating Rates ◽  
Electrically Conductive ◽  
Thermoplastic Matrix

Induction welding involves generating heat by applying an oscillating magnetic field, which produces eddy currents and Joule losses in an electrically-conductive material or hysteresis losses in a magnetic material. Most applications rely on eddy currents generation as composites are often made of electrically-conductive carbon fibres. However, in other applications, heat can be produced by a magnetic susceptor located at the weld interface of the parts to be joined. Composite films of magnetic particles dispersed in a thermoplastic matrix can serve as magnetic susceptors. Magnetic particles selection relies on various parameters that must be thoroughly defined beforehand. Firstly, the applied magnetic field amplitude and frequency is calculated, based on the generated current and the induction coil geometry. Secondly, the thermoplastic matrix is characterized, mainly with DSC measurements, to define its processing window. Finally, the magnetic properties of the particles are measured – for instance using a vibrating sample magnetometer (VSM) – to obtain the hysteresis curve for the applied field. The enclosed surface area of the hysteresis curve (i.e. absorbed energy density) is critical, as low hysteresis materials (i.e. soft magnets) will not dissipate enough heat, while high hysteresis materials (i.e. hard magnets) cannot be fully exploited as the saturation hysteresis is not reached within the used field amplitude. A methodology to approximate the hysteresis enclosed surface area with limited data is proposed, helping to anticipate the heating rate of a susceptor candidate material. Based on these parameters, the theoretical heating rates of three magnetic susceptor materials (magnetic particles of iron, nickel and magnetite) for induction welding are calculated. They are verified experimentally by comparing with the hysteresis analysis and by measuring the temperature evolution of samples made of polypropylene containing the magnetic particles.

scholarly journals Certification of the efficient random number generation technique based on single‐photon detector arrays and time‐to‐digital converters

2021 ◽  
Vol 2 (3) ◽  
pp. 74-79
Author(s):  
Andrea Stanco ◽  
Davide G. Marangon ◽  
Giuseppe Vallone ◽  
Samuel Burri ◽  
Edoardo Charbon ◽  
...  
Keyword(s):  
Random Number ◽  
Single Photon ◽  
Random Number Generation ◽  
Photon Detector ◽  
Single Photon Detector ◽  
Detector Arrays ◽  
Generation Technique ◽  
Number Generation

Analysis of magneto rheological elastomers for energy harvesting systems

2020 ◽  
Vol 64 (1-4) ◽  
pp. 439-446
Author(s):  
Gildas Diguet ◽  
Gael Sebald ◽  
Masami Nakano ◽  
Mickaël Lallart ◽  
Jean-Yves Cavaillé
Keyword(s):  
Magnetic Field ◽  
Energy Harvesting ◽  
Shear Strain ◽  
Magnetic Induction ◽  
Magnetic Particles ◽  
Homogeneous Magnetic Field ◽  
Electrical Signal ◽  
Harvesting Systems ◽  
Dc Bias ◽  
Magneto Rheological

Magneto Rheological Elastomers (MREs) are composite materials based on an elastomer filled by magnetic particles. Anisotropic MRE can be easily manufactured by curing the material under homogeneous magnetic field which creates column of particles. The magnetic and elastic properties are actually coupled making these MREs suitable for energy conversion. From these remarkable properties, an energy harvesting device is considered through the application of a DC bias magnetic induction on two MREs as a metal piece is applying an AC shear strain on them. Such strain therefore changes the permeabilities of the elastomers, hence generating an AC magnetic induction which can be converted into AC electrical signal with the help of a coil. The device is simulated with a Finite Element Method software to examine the effect of the MRE parameters, the DC bias magnetic induction and applied shear strain (amplitude and frequency) on the resulting electrical signal.

Random Number Generation Based on the Rossler Attractor

2014 ◽  
Vol 1 ◽  
pp. 272-275 ◽  
Author(s):  
Vincent Canals ◽  
Antoni Morro ◽  
Josep L. Rosselló
Keyword(s):  
Random Number ◽  
Random Number Generation ◽  
Number Generation
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