KM HF - 22 kg - magnetic bracket

Pros and cons of neodymium magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
• They show high resistance to demagnetization induced by external field influence,
• In other words, due to the smooth layer of gold, the element gains visual value,
• Magnetic induction on the surface of the magnet turns out to be exceptional,
• 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 precise modeling and adapting to concrete needs,
• Universal use in advanced technology sectors – they serve a role in mass storage devices, brushless drives, medical equipment, as well as multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in miniature devices

Disadvantages of NdFeB magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
• Limited possibility of producing nuts in the magnet and complex forms - recommended is a housing - magnetic holder.
• Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, tiny parts of these products can be problematic in diagnostics medical in case of swallowing.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum lifting force for a neodymium magnet – what contributes to it?

The declared magnet strength concerns the peak performance, obtained under laboratory conditions, specifically:

• on a base made of structural steel, optimally conducting the magnetic flux
• whose transverse dimension equals approx. 10 mm
• with an polished contact surface
• under conditions of gap-free contact (surface-to-surface)
• under axial force direction (90-degree angle)
• at conditions approx. 20°C

Practical aspects of lifting capacity – factors

Please note that the working load may be lower subject to elements below, in order of importance:

• Distance – existence of foreign body (paint, dirt, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
• Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
• Plate material – mild steel gives the best results. Alloy admixtures lower magnetic properties and lifting capacity.
• Base smoothness – the more even the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
• Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance {between} the magnet and the plate decreases the lifting capacity.