NC NeoCube fi 5 mm kuleczki srebrne / N38 - neocube

Advantages as well as disadvantages of NdFeB magnets.

Besides their exceptional pulling force, neodymium magnets offer the following advantages:

• They retain attractive force for almost 10 years – the loss is just ~1% (according to analyses),
• They possess excellent resistance to magnetism drop due to external magnetic sources,
• By applying a lustrous layer of nickel, the element has an proper look,
• The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures approaching 230°C and above...
• Due to the option of free forming and customization to specialized needs, neodymium magnets can be created in a broad palette of forms and dimensions, which makes them more universal,
• Versatile presence in high-tech industry – they serve a role in hard drives, electromotive mechanisms, medical equipment, and other advanced devices.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
• NdFeB 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 very 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 those in rubber or plastics, which prevent oxidation and corrosion.
• We recommend casing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex forms.
• Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these devices can disrupt the diagnostic process medical when they are in the body.
• With mass production the cost of neodymium magnets is a challenge,

Maximum lifting capacity of the magnet – what it depends on?

The force parameter is a theoretical maximum value executed under the following configuration:

• on a base made of structural steel, perfectly concentrating the magnetic field
• possessing a massiveness of minimum 10 mm to avoid saturation
• with a plane free of scratches
• under conditions of no distance (surface-to-surface)
• during detachment in a direction vertical to the mounting surface
• at ambient temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

In practice, the real power is determined by many variables, ranked from crucial:

• Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Direction of force – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
• Steel thickness – insufficiently thick plate causes magnetic saturation, causing part of the power to be escaped into the air.
• Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content lower magnetic permeability and holding force.
• Smoothness – ideal contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
• Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

* Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet’s surface and the plate lowers the load capacity.