Magnetizing and measuring B & H in high energy product rare earth permanent magnets

1986 ◽  
Vol 22 (5) ◽  
pp. 1075-1077 ◽  
Author(s):  
D. McDonald
Keyword(s):  
Rare Earth ◽  
Permanent Magnets ◽  
High Energy ◽  
Energy Product

Nanocrystalline structures and the enhancement of remanence and energy product in melt spun iron-rare earth-boron alloys for permanent magnets

1993 ◽  
Vol 3 (1-6) ◽  
pp. 512 ◽  
Author(s):  
H.A. Davies ◽  
A. Manaf ◽  
M. Leonowicz ◽  
P.Z. Zhang ◽  
S.J. Dobson ◽  
...  
Keyword(s):  
Rare Earth ◽  
Permanent Magnets ◽  
Energy Product ◽  
Melt Spun ◽  
Nanocrystalline Structures

Efficient near Net-Shape Production of High Energy Rare Earth Magnets by Laser Beam Melting

2017 ◽  
Vol 871 ◽  
pp. 137-144 ◽  
Author(s):  
Nikolaus Urban ◽  
Alexander Meyer ◽  
Sven Kreitlein ◽  
Felix Leicht ◽  
Jörg Franke
Keyword(s):  
Rare Earth ◽  
Laser Beam ◽  
Permanent Magnets ◽  
High Energy ◽  
Parameter Study ◽  
Efficient Production ◽  
Rare Earth Magnet ◽  
Laser Beam Melting ◽  
Near Net Shape ◽  
The Impact

In this publication we report on our progress in investigating the energy efficient production of rare earth permanent magnets by Laser Beam Melting in the powder bed (LBM). This innovative additive manufacturing process offers the potential to produce magnets of complex geometries without an energy intensive oven sintering step. Another advantage that increases the efficiency of this possible new process route is the high degree of material utilization due to a near net shape production of the magnets. Hence only little material is wasted during a post processing machining step. The main challenge in processing rare earth magnet alloys by means of LBM is the brittle mechanical behavior of the material and the change in microstructure due to the complete remelting of the magnet powder. We therefor expanded the parameter study presented in previous work in order to further increase relative density and magnetic properties of the specimens. In this context process stability and reproducibility could also be increased. This was achieved by investigating the impact of different exposure patterns and varying laser spot sizes. Simultaneously to the experiments the energy consumption of the LBM process was measured and compared with conventional rare earth magnet production routes.

A Comparative Study between Low and High-Energy Milling Processes for the Production of HD PrFeCoBNb Sintered Magnets

2008 ◽  
Vol 591-593 ◽  
pp. 114-119 ◽  
Author(s):  
E.A. Périgo ◽  
E.P. Soares ◽  
Hidetoshi Takiishi ◽  
C.C. Motta ◽  
Rubens Nunes de Faria Jr.
Keyword(s):  
Ball Milling ◽  
Permanent Magnets ◽  
High Energy ◽  
Maximum Energy ◽  
Maximum Energy Product ◽  
High Energy Milling ◽  
Energy Product ◽  
Energy Processing ◽  
Hydrogen Decrepitation ◽  
High Degree

Roller-ball milling (RBM) or planetary ball milling (PBM) have been used together with the hydrogen decrepitation (HD) process to produce sintered permanent magnets based on a mixture of Pr16Fe76B8 and Pr14.00Fe63.90Co16.00B6.00Nb0.10 magnetic alloys. Five distinct compositions have been studied comparing low- and high-energy milling. Magnets with a particular composition and prepared using these two routes exhibited similar magnetic properties. Modifications have been carried out in the procedure of the HD stage for PBM in order to guarantee a high degree of crystallographic alignment. Pr15.00Fe69.95Co8.00B7.00Nb0.05 magnets showed the best maximum energy product for both processing routes (~ 247 kJm-3). A significant reduction in the milling time (93%) has been achieved with high-energy processing, the greatest advantage over the low-energy route.

Effect of microstructure parameter on the energy product in two-phase permanent magnetic materials

2019 ◽  
Vol 33 (03) ◽  
pp. 1950025
Author(s):  
Reshma Reba Alexander ◽  
R. Justin Joseyphus
Keyword(s):  
Magnetic Materials ◽  
Permanent Magnets ◽  
High Energy ◽  
Microstructural Parameter ◽  
Two Phase ◽  
Magnetic Phases ◽  
Microstructure Parameter ◽  
Energy Product ◽  
Effect Of Microstructure

Two-phase permanent magnets with soft and hard magnetic phases are suitable candidates for high energy product permanent magnets. To obtain enhanced energy product, the microstructure has to be optimum and the magnetization and nucleation field has to be as large as possible. The present studies suggest suitable combinations of soft–hard composites that could result in higher energy product. The role of microstructural parameter on the energy product is also presented.

NdFeB/αFe Nanocomposite Permanent Magnets with Enhanced Properties Prepared by Spark Plasma Sintering

2011 ◽  
Vol 672 ◽  
pp. 229-232
Author(s):  
Marian Grigoraş ◽  
M. Lostun ◽  
Nicoleta Lupu ◽  
Horia Chiriac
Keyword(s):  
Spark Plasma Sintering ◽  
Permanent Magnets ◽  
High Energy ◽  
Maximum Energy ◽  
Maximum Energy Product ◽  
Energy Product ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Energy Ball ◽  
Melt Spun Ribbons

Nanocomposite NdFeB/αFe magnets were obtained by spark plasma sintering technique using high energy ball-milled Nd-Fe-B melt-spun ribbons mixed in different weight ratios with Fe commercial powders. The remanence of SPS nanocomposite magnets increases with the Fe powders content from 6.1 for 4 wt.% Fe to 6.4 kG for 5 wt.% Fe, while the estimated maximum energy product is also increased from 9.0 to 10.6 MGOe.

Nanocrystalline structures and the enhancement of remanence and energy product in melt spun iron-rare earth-boron alloys for permanent magnets

1993 ◽  
Vol 2 (2) ◽  
pp. 197-203 ◽  
Author(s):  
H.A. Davies ◽  
A. Manaf ◽  
M. Leonowicz ◽  
P.Z. Zhang ◽  
S.J. Dobson ◽  
...  
Keyword(s):  
Rare Earth ◽  
Permanent Magnets ◽  
Energy Product ◽  
Melt Spun ◽  
Nanocrystalline Structures

scholarly journals Low Frequency Axial Flux Linear Oscillating Electric Drive Suitable for Short Strokes

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Govindaraj Thangavel
Keyword(s):  
Rare Earth ◽  
Permanent Magnets ◽  
Low Frequency ◽  
Weight Ratio ◽  
High Energy ◽  
High Energy Density ◽  
Axial Flux ◽  
And Control ◽  
Control Methodology ◽  
Good Agreement

The design, analysis, and control methodology of an energy efficient and high force to weight ratio rare earth N42 NdFeB based permanent magnet linear oscillating motor has been described. For this axial flux machine the mover is consisting of Aluminium structure embedded with rare earth permanent magnets of high energy density. Microcontroller based drive is developed for frequency and thrust control of the machine. Finite element method using FEMM is employed for analysis of various performance parameters of machine. The same parameters are also compared with the measured ones, which yields a good agreement to the proposed design.

High‐energy product Nd‐Fe‐B permanent magnets

1984 ◽  
Vol 44 (1) ◽  
pp. 148-149 ◽  
Author(s):  
J. J. Croat ◽  
J. F. Herbst ◽  
R. W. Lee ◽  
F. E. Pinkerton
Keyword(s):  
Permanent Magnets ◽  
High Energy ◽  
Energy Product
Sign in / Sign up

Export Citation Format

Share Document