UMP 67x28 [M8+M10] GW F120 kg / N38 - search holder

Pros and cons of neodymium magnets.

Apart from their strong power, neodymium magnets have these key benefits:

• They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
• They do not lose their magnetic properties even under close interference source,
• Thanks to the metallic finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an elegant appearance,
• The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Thanks to freedom in constructing and the capacity to modify to client solutions,
• Versatile presence in innovative solutions – they are utilized in computer drives, electric drive systems, diagnostic systems, and technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in small systems

Cons of neodymium magnets: weaknesses and usage proposals

• To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Limited possibility of creating nuts in the magnet and complex forms - preferred is cover - mounting mechanism.
• Health risk related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these products are able to disrupt the diagnostic process medical in case of swallowing.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Breakaway strength of the magnet in ideal conditions – what it depends on?

The lifting capacity listed is a theoretical maximum value conducted under the following configuration:

• with the contact of a sheet made of low-carbon steel, guaranteeing maximum field concentration
• whose thickness reaches at least 10 mm
• with a plane cleaned and smooth
• under conditions of ideal adhesion (metal-to-metal)
• during pulling in a direction perpendicular to the mounting surface
• at temperature room level

Magnet lifting force in use – key factors

It is worth knowing that the working load may be lower influenced by the following factors, starting with the most relevant:

• Distance – existence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
• Angle of force application – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
• Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
• Metal type – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
• Smoothness – full contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
• Thermal environment – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

* Lifting capacity was determined with the use of a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap {between} the magnet and the plate lowers the lifting capacity.