MPL 10x10x10 / N38 - lamellar magnet

Advantages as well as disadvantages of NdFeB magnets.

Apart from their notable magnetic energy, neodymium magnets have these key benefits:

• Their strength is maintained, and after approximately 10 years it decreases only by ~1% (theoretically),
• They are resistant to demagnetization induced by external magnetic fields,
• By covering with a reflective layer of nickel, the element has an elegant look,
• They are known for high magnetic induction at the operating surface, which improves attraction properties,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
• Thanks to modularity in designing and the ability to modify to specific needs,
• Key role in advanced technology sectors – they serve a role in data components, drive modules, diagnostic systems, as well as industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in compact constructions

Disadvantages of NdFeB magnets:

• To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
• We recommend cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex forms.
• Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Additionally, tiny parts of these products are able to be problematic in diagnostics medical when they are in the body.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Highest magnetic holding force – what contributes to it?

Magnet power was determined for the most favorable conditions, including:

• using a plate made of low-carbon steel, serving as a ideal flux conductor
• possessing a massiveness of min. 10 mm to ensure full flux closure
• with a surface free of scratches
• with zero gap (no coatings)
• during detachment in a direction perpendicular to the plane
• at standard ambient temperature

Determinants of practical lifting force of a magnet

In practice, the actual lifting capacity depends on several key aspects, presented from crucial:

• Distance (betwixt the magnet and the metal), as even a tiny distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
• Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
• Plate thickness – too thin sheet does not accept the full field, causing part of the flux to be escaped to the other side.
• Steel grade – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
• Surface condition – ground elements ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
• Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under parallel forces the holding force is lower. Additionally, even a slight gap {between} the magnet’s surface and the plate decreases the load capacity.