KM HF - 22 kg - magnetic bracket

Advantages as well as disadvantages of rare earth magnets.

Besides their stability, neodymium magnets are valued for these benefits:

• They do not lose strength, even during approximately 10 years – the reduction in power is only ~1% (based on measurements),
• They possess excellent resistance to weakening of magnetic properties due to external magnetic sources,
• By covering with a decorative layer of gold, the element presents an professional look,
• Magnetic induction on the top side of the magnet is extremely intense,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Possibility of custom shaping as well as optimizing to defined requirements,
• Huge importance in modern industrial fields – they are utilized in computer drives, electric drive systems, precision medical tools, as well as multitasking production systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as 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.
• Limited ability of producing nuts in the magnet and complex shapes - preferred is cover - magnetic holder.
• Health risk related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Additionally, small components of these products can be problematic in diagnostics medical when they are in the body.
• With large orders the cost of neodymium magnets is economically unviable,

Maximum lifting capacity of the magnet – what contributes to it?

Holding force of 22 kg is a result of laboratory testing performed under specific, ideal conditions:

• on a base made of structural steel, perfectly concentrating the magnetic field
• possessing a massiveness of at least 10 mm to avoid saturation
• with an ground touching surface
• without the slightest clearance between the magnet and steel
• for force acting at a right angle (pull-off, not shear)
• in neutral thermal conditions

Lifting capacity in real conditions – factors

It is worth knowing that the application force will differ influenced by elements below, starting with the most relevant:

• Distance – existence of foreign body (rust, dirt, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
• Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
• Steel grade – ideal substrate is high-permeability steel. Stainless steels may attract less.
• Surface structure – the smoother and more polished the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
• Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

* Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the lifting capacity is smaller. Moreover, even a small distance {between} the magnet and the plate lowers the load capacity.