permanent Neodymium ( NdFeb) Magnets - ALL Magnetics Inc.

 

permanent neodymium magnets -- Strongest magnets

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Neodymium Block Magnet
Neodymium Disc Magnet
Neodymium Ring Magnet
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Neodymium (NdFeB) MAGNETS

Neodymium permanent magnets (Nd-Fe-B) are composed of neodymium, iron, boron and a few transition metals. These magnets are extremely strong for their small size, metallic in appearance and found in simple shapes such as rings, blocks and discs.

  • Attributes of Neodymium
  • Very high resistance to demagnetization
  • High energy for size
  • Good in ambient temperature
  • Moderately priced
  • Material is corrosive and should be coated for long term maximum energy output
  • Low working temperature for heat applications, but higher levels of heat resistance materials are being introduced periodically.

Applications of Neodymium
Magnetic separators, linear actuators, microphone assemblies, servo motors, DC motors (automotive starters), computer rigid disc drives, printers and speakers.

Tolerances
For as pressed material, tolerance on the thickness (direction of magnetization) is ± .005. Other dimensions are ± 2.5% or ± .010, whichever is greater. According to IMA standards, visual imperfections such as hairline cracks, porosity and minor chips are commonly found in sintered metallic magnets. A chipped edge is considered acceptable if no more than 10% of the surface is missing. Cracks are acceptable as long as they do not extend across more than 50% of pole surface.

Arc Magnets

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Neodymium Ring Magnets

Neodymium Ring Magnets

Neodymium Block Magnets

Neodymium Block Magnets

Neodymium Disc Magnets

Neodymium Disc Magnets

Typical Magnetic and Physical Properties of Neodymium Magnet Material
Anisotropy Alnico Density

 

Maximum energy Product BH(max) Residual induction Br Coercive Force Hc Intrinsic Coercive Force Hci Maximum Operating Temperature Curie Temperature
Lbs/in g/cm MGO Gauss Oersteds Oersteds F C F C
Neodymium27
0.267 7.4 27.0 10800 9300 11000 176 80 536 280
Neodymium27H
0.267 7.4 27.0 10800 9800 17000 212 100 572 300
Neodymium30
0.267 7.4 30.0 11000 10000 18000 176 80 536 280
Neodymium30H
0.267 7.4 30.0 11000 10500 17000 212 100 572 300
Neodymium35
0.267 7.4 35.0 12300 10500 12000 176 80 536 280

Magnetizing and Handling
Neodymium magnets are very brittle and very strong magnetically. Therefore, it is crucial to handle these magnets with extreme care to avoid personal injury and damage to the magnets. Fingers can be severely pinched between attracting magnets. Magnets can chip if allowed to “jump at” an attracting object. It is highly recommended that when constructing rare earth magnetic assemblies, they be magnetized after assembly.

Machining
Since neodymium magnet material is prone to chipping and cracking, it does not lend itself to conventional machining methods. It can, however, be abrasively ground, but only with the use of liberal amounts of coolant. The coolant minimizes heat fracturing and the risk of fires caused by oxidized grinding dust.

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