NC NeoCube fi 5 mm kuleczki kolorowe / N38 - neocube

Strengths as well as weaknesses of neodymium magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• Their magnetic field remains stable, and after around ten years it decreases only by ~1% (according to research),
• They retain their magnetic properties even under strong external field,
• Thanks to the metallic finish, the plating of nickel, gold-plated, or silver gives an professional appearance,
• Neodymium magnets deliver maximum magnetic induction on a contact point, which increases force concentration,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Thanks to modularity in forming and the ability to modify to individual projects,
• Fundamental importance in modern industrial fields – they find application in computer drives, electromotive mechanisms, advanced medical instruments, and technologically advanced constructions.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

What to avoid - cons of neodymium magnets and proposals for their use:

• At 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 their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• We recommend a housing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complex shapes.
• Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Additionally, small components of these products can 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 affects it?

Holding force of 0 kg is a result of laboratory testing performed under standard conditions:

• on a base made of mild steel, optimally conducting the magnetic flux
• possessing a massiveness of min. 10 mm to ensure full flux closure
• with a plane perfectly flat
• without the slightest air gap between the magnet and steel
• under perpendicular force vector (90-degree angle)
• in stable room temperature

Practical lifting capacity: influencing factors

It is worth knowing that the magnet holding will differ subject to the following factors, starting with the most relevant:

• Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
• Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of nominal force).
• Base massiveness – too thin steel does not accept the full field, causing part of the power to be wasted to the other side.
• Chemical composition of the base – mild steel gives the best results. Alloy steels decrease magnetic properties and holding force.
• Surface condition – ground elements ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
• Thermal factor – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was assessed using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the holding force is lower. Additionally, even a slight gap {between} the magnet’s surface and the plate reduces the load capacity.