NC NeoCube 5 mm kwadraty / N38 - neocube

Strengths and weaknesses of rare earth magnets.

Besides their exceptional field intensity, neodymium magnets offer the following advantages:

• They retain attractive force for almost 10 years – the loss is just ~1% (based on simulations),
• Magnets very well protect themselves against demagnetization caused by foreign field sources,
• In other words, due to the reflective surface of gold, the element gains visual value,
• Neodymium magnets ensure maximum magnetic induction on a their surface, which ensures high operational effectiveness,
• 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...
• Considering the ability of precise forming and adaptation to unique projects, NdFeB magnets can be manufactured in a variety of shapes and sizes, which amplifies use scope,
• Significant place in innovative solutions – they are used in mass storage devices, brushless drives, precision medical tools, as well as industrial machines.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of neodymium magnets:

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
• Neodymium magnets lose their strength 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
• 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 secure oxidation and corrosion.
• We recommend cover - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated shapes.
• Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these magnets can complicate diagnosis 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

Detachment force of the magnet in optimal conditions – what contributes to it?

Holding force of 0 kg is a result of laboratory testing performed under the following configuration:

• with the application of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
• whose transverse dimension reaches at least 10 mm
• with a surface cleaned and smooth
• under conditions of gap-free contact (surface-to-surface)
• during pulling in a direction vertical to the plane
• in stable room temperature

Determinants of practical lifting force of a magnet

During everyday use, the real power depends on many variables, ranked from most significant:

• Gap between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
• Direction of force – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
• Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
• Material type – ideal substrate is pure iron steel. Cast iron may attract less.
• Surface condition – smooth surfaces ensure maximum contact, which improves force. Uneven metal weaken the grip.
• Temperature – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.

* Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet’s surface and the plate reduces the lifting capacity.