NC NeoCube fi 5 mm kuleczki kolorowe / N38 - neocube

Strengths as well as weaknesses of rare earth magnets.

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

• They retain full power for nearly 10 years – the drop is just ~1% (according to analyses),
• Magnets perfectly resist against loss of magnetization caused by foreign field sources,
• In other words, due to the glossy layer of silver, the element gains a professional look,
• Magnets possess extremely high magnetic induction on the working surface,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• Due to the option of precise molding and adaptation to individualized needs, NdFeB magnets can be modeled in a wide range of shapes and sizes, which expands the range of possible applications,
• Huge importance in modern technologies – they serve a role in computer drives, brushless drives, medical devices, also industrial machines.
• Thanks to their power density, small magnets offer high operating force, in miniature format,

Characteristics of disadvantages of neodymium magnets and ways of using them

• At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
• Neodymium magnets lose force 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 very resistant to heat
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
• We recommend a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complicated shapes.
• Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. It is also worth noting that small elements of these magnets are able to complicate diagnosis medical in case of swallowing.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum lifting force for a neodymium magnet – what it depends on?

Information about lifting capacity is the result of a measurement for the most favorable conditions, including:

• using a plate made of mild steel, functioning as a magnetic yoke
• whose transverse dimension reaches at least 10 mm
• with a surface free of scratches
• under conditions of gap-free contact (surface-to-surface)
• under axial force direction (90-degree angle)
• in neutral thermal conditions

Practical aspects of lifting capacity – factors

Please note that the working load will differ depending on elements below, in order of importance:

• Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of nominal force).
• Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Metal type – different alloys attracts identically. Alloy additives weaken the attraction effect.
• Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
• Thermal environment – temperature increase results in weakening of induction. Check the thermal limit for a given model.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance {between} the magnet’s surface and the plate decreases the holding force.