Industry Motor Permanet Magnet Feature:
Material: Neodymium, Grade N42H
Plating/Coating: Nickel-Copper-Nickel
Magnetization Direction: North on outside face
Max. Operating Temperature: 120°C
Neodymium 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. Not sure if Neodymium is the best material for your application? Click here for an attribute and
application comparison for all of the magnetic materials we offer.
Applications of Neodymium Magnets
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 +/– .005”, whichever is greater.
According to International Magnetics Association/Magnet Materials Producers Association (IMA/MMPA) standards, visual imperfections such as hairline cracks, porosity
and minor chips are commonly found in sintered 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 the pole’s surface.
Attributes of Neodymium Material
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
Machining
Since neodymium magnet material is prone to chipping and cracking, it does not lend itself to conventional machining methods. However, neodymium can 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.
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.
