NC NeoCube fi 5 mm kuleczki kolorowe / N38 - neocube

Advantages and disadvantages of NdFeB magnets.

Besides their exceptional magnetic power, neodymium magnets offer the following advantages:

• They do not lose power, even over around ten years – the decrease in strength is only ~1% (based on measurements),
• They are extremely resistant to demagnetization induced by presence of other magnetic fields,
• A magnet with a shiny gold surface is more attractive,
• Magnetic induction on the surface of the magnet is maximum,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
• Considering the option of accurate shaping and adaptation to custom solutions, neodymium magnets can be manufactured in a variety of forms and dimensions, which expands the range of possible applications,
• Versatile presence in future technologies – they are utilized in magnetic memories, motor assemblies, advanced medical instruments, also multitasking production systems.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

What to avoid - cons of neodymium magnets: application proposals

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
• When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding 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 prevent oxidation as well as corrosion.
• We suggest casing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex forms.
• Health risk to health – tiny shards of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets can disrupt the diagnostic process medical in case of swallowing.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Optimal lifting capacity of a neodymium magnet – what affects it?

Magnet power is the result of a measurement for optimal configuration, assuming:

• with the contact of a yoke made of special test steel, ensuring full magnetic saturation
• whose thickness reaches at least 10 mm
• characterized by smoothness
• without any air gap between the magnet and steel
• during detachment in a direction perpendicular to the mounting surface
• in stable room temperature

Determinants of practical lifting force of a magnet

In real-world applications, the actual holding force results from several key aspects, listed from most significant:

• Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
• Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
• Base massiveness – too thin plate does not close the flux, causing part of the power to be wasted to the other side.
• Metal type – not every steel attracts identically. High carbon content worsen the attraction effect.
• Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
• Thermal environment – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a small distance {between} the magnet’s surface and the plate lowers the load capacity.