NC NeoCube fi 5 mm kuleczki srebrne / N38 - neocube

Pros and cons of NdFeB magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

• They retain full power for around 10 years – the drop is just ~1% (in theory),
• They are extremely resistant to demagnetization induced by external magnetic fields,
• The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to present itself better,
• Magnets are distinguished by excellent magnetic induction on the working surface,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
• In view of the option of flexible shaping and customization to custom solutions, magnetic components can be modeled in a broad palette of forms and dimensions, which amplifies use scope,
• Significant place in future technologies – they find application in HDD drives, brushless drives, medical devices, and modern systems.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in small systems

What to avoid - cons of neodymium magnets: application proposals

• Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also raises their durability
• Neodymium magnets decrease 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
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• We recommend cover - magnetic holder, due to difficulties in producing nuts inside the magnet and complex shapes.
• Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small components of these products are able to 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 hinders application in large quantities

Maximum holding power of the magnet – what affects it?

Information about lifting capacity is the result of a measurement for optimal configuration, including:

• with the use of a sheet made of special test steel, ensuring full magnetic saturation
• whose transverse dimension is min. 10 mm
• with a plane free of scratches
• with direct contact (without impurities)
• during detachment in a direction vertical to the plane
• at room temperature

Determinants of practical lifting force of a magnet

Please note that the application force will differ depending on elements below, starting with the most relevant:

• Distance – the presence of any layer (rust, dirt, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
• Base massiveness – too thin plate causes magnetic saturation, causing part of the flux to be lost into the air.
• Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
• Base smoothness – the more even the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
• Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity was assessed with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance {between} the magnet and the plate lowers the lifting capacity.