NC NeoCube fi 5 mm kuleczki srebrne / N38 - neocube

Strengths and weaknesses of neodymium magnets.

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:

• They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (according to literature),
• They are extremely resistant to demagnetization induced by external magnetic fields,
• By applying a lustrous layer of gold, the element gains an proper look,
• Magnetic induction on the working layer of the magnet remains impressive,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Possibility of detailed shaping as well as modifying to specific needs,
• Universal use in modern industrial fields – they are used in mass storage devices, drive modules, advanced medical instruments, also modern systems.
• Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Problematic aspects of neodymium magnets and proposals for their use:

• At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
• Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
• Due to limitations in realizing nuts and complex forms in magnets, we recommend using a housing - magnetic mount.
• Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these devices are able to complicate diagnosis medical when they are in the body.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Maximum holding power of the magnet – what affects it?

The force parameter is a measurement result conducted under specific, ideal conditions:

• on a plate made of structural steel, optimally conducting the magnetic flux
• whose transverse dimension equals approx. 10 mm
• characterized by lack of roughness
• with total lack of distance (without impurities)
• during pulling in a direction perpendicular to the mounting surface
• at temperature room level

Practical aspects of lifting capacity – factors

Effective lifting capacity is affected by specific conditions, mainly (from priority):

• Air gap (between the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
• Angle of force application – highest force is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
• Base massiveness – insufficiently thick steel causes magnetic saturation, causing part of the flux to be wasted to the other side.
• Steel grade – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
• Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal weaken the grip.
• Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was measured using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the holding force is lower. Moreover, even a slight gap {between} the magnet and the plate reduces the lifting capacity.