NC NeoCube fi 5 mm kuleczki kolorowe / N38 - neocube

Strengths as well as weaknesses of rare earth magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

• They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
• They are resistant to demagnetization induced by presence of other magnetic fields,
• The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
• Magnetic induction on the working layer of the magnet remains very high,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Thanks to flexibility in constructing and the ability to customize to complex applications,
• Key role in future technologies – they find application in computer drives, motor assemblies, diagnostic systems, also multitasking production systems.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

What to avoid - cons of neodymium magnets: tips and applications.

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
• Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Due to limitations in creating threads and complex shapes in magnets, we recommend using casing - magnetic holder.
• Health risk to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these devices are able to be problematic in diagnostics medical when they are in the body.
• With large orders the cost of neodymium magnets is economically unviable,

Maximum magnetic pulling force – what contributes to it?

Holding force of 0 kg is a theoretical maximum value performed under standard conditions:

• on a base made of structural steel, perfectly concentrating the magnetic flux
• whose transverse dimension equals approx. 10 mm
• with an polished touching surface
• without the slightest clearance between the magnet and steel
• during pulling in a direction perpendicular to the mounting surface
• in stable room temperature

Impact of factors on magnetic holding capacity in practice

Real force impacted by working environment parameters, including (from most important):

• Gap (betwixt the magnet and the plate), as even a tiny distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to paint, corrosion or dirt).
• Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
• Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
• Material type – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
• Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
• Temperature – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as 75%. In addition, even a minimal clearance {between} the magnet and the plate lowers the holding force.