KM HF - 11,3 kg - magnetic bracket

Advantages and disadvantages of rare earth magnets.

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

• They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (according to theory),
• Magnets perfectly defend themselves against loss of magnetization caused by external fields,
• By covering with a reflective coating of nickel, the element acquires an nice look,
• Magnets are characterized by extremely high magnetic induction on the surface,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
• Considering the potential of free molding and adaptation to individualized requirements, neodymium magnets can be manufactured in a broad palette of geometric configurations, which makes them more universal,
• Universal use in modern technologies – they are utilized in data components, electric motors, advanced medical instruments, also other advanced devices.
• Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

• Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
• Neodymium magnets lose their power 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 suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
• Limited possibility of making nuts in the magnet and complicated shapes - preferred is a housing - magnetic holder.
• Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Furthermore, tiny parts of these products can complicate diagnosis medical after entering the body.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Magnetic strength at its maximum – what contributes to it?

The declared magnet strength represents the peak performance, recorded under optimal environment, namely:

• on a plate made of structural steel, optimally conducting the magnetic flux
• with a thickness no less than 10 mm
• characterized by even structure
• without any air gap between the magnet and steel
• during pulling in a direction vertical to the mounting surface
• in neutral thermal conditions

What influences lifting capacity in practice

Holding efficiency is influenced by specific conditions, mainly (from most important):

• Clearance – the presence of any layer (rust, tape, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
• Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Base massiveness – too thin plate causes magnetic saturation, causing part of the power to be escaped to the other side.
• Steel grade – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
• Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance {between} the magnet and the plate decreases the holding force.