KM HF - 34,5 kg - magnetic bracket

Advantages as well as disadvantages of neodymium magnets.

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

• They retain attractive force for around ten years – the loss is just ~1% (according to analyses),
• Magnets perfectly resist against loss of magnetization caused by ambient magnetic noise,
• Thanks to the reflective finish, the coating of nickel, gold-plated, or silver gives an aesthetic appearance,
• Magnetic induction on the working layer of the magnet remains strong,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Thanks to modularity in designing and the ability to customize to client solutions,
• Fundamental importance in high-tech industry – they serve a role in data components, motor assemblies, medical devices, and technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in small systems

Disadvantages of NdFeB magnets:

• To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
• Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in realizing nuts and complicated shapes in magnets, we recommend using cover - magnetic holder.
• Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these devices are able to complicate diagnosis medical in case of swallowing.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

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

Breakaway force was defined for ideal contact conditions, assuming:

• on a base made of structural steel, perfectly concentrating the magnetic flux
• possessing a thickness of at least 10 mm to ensure full flux closure
• with a plane free of scratches
• with direct contact (no impurities)
• for force applied at a right angle (pull-off, not shear)
• at temperature room level

Impact of factors on magnetic holding capacity in practice

Bear in mind that the application force will differ influenced by the following factors, starting with the most relevant:

• Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
• Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
• Steel type – 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. Any scratches and bumps reduce the real contact area, reducing force.
• Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a slight gap {between} the magnet’s surface and the plate decreases the holding force.