NC NeoCube fi 5 mm kuleczki srebrne / N38 - neocube

Pros and cons of neodymium magnets.

Apart from their superior magnetism, neodymium magnets have these key benefits:

• They retain magnetic properties for nearly ten years – the loss is just ~1% (based on simulations),
• Neodymium magnets prove to be highly resistant to loss of magnetic properties caused by magnetic disturbances,
• In other words, due to the reflective layer of gold, the element looks attractive,
• Magnetic induction on the top side of the magnet is maximum,
• Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to versatility in shaping and the ability to customize to specific needs,
• Fundamental importance in modern industrial fields – they serve a role in data components, electromotive mechanisms, advanced medical instruments, and industrial machines.
• Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

• They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
• Neodymium magnets lose strength 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. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
• Limited possibility of making threads in the magnet and complex forms - preferred is casing - magnetic holder.
• Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Optimal lifting capacity of a neodymium magnet – what contributes to it?

The declared magnet strength concerns the limit force, measured under ideal test conditions, meaning:

• on a base made of mild steel, perfectly concentrating the magnetic field
• whose thickness reaches at least 10 mm
• with a plane cleaned and smooth
• under conditions of ideal adhesion (metal-to-metal)
• under axial force direction (90-degree angle)
• at ambient temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

Bear in mind that the magnet holding will differ subject to elements below, in order of importance:

• Space between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
• Angle of force application – maximum parameter is available only during perpendicular pulling. The resistance to sliding of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
• Plate thickness – too thin sheet does not accept the full field, causing part of the flux to be wasted to the other side.
• Material type – the best choice is pure iron steel. Cast iron may attract less.
• Surface quality – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
• Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, however under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance {between} the magnet’s surface and the plate reduces the load capacity.