SM 18x150 [2xM5] / N42 - magnetic separator

Strengths as well as weaknesses of NdFeB magnets.

Besides their remarkable strength, neodymium magnets offer the following advantages:

• They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
• They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
• A magnet with a smooth nickel surface has better aesthetics,
• The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
• Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to modularity in designing and the ability to customize to individual projects,
• Fundamental importance in advanced technology sectors – they serve a role in hard drives, drive modules, advanced medical instruments, also complex engineering applications.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
• Due to limitations in realizing nuts and complex forms in magnets, we recommend using a housing - magnetic mount.
• Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these products are able to be problematic in diagnostics medical after entering the body.
• Due to complex production process, their price exceeds standard values,

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Magnet power is the result of a measurement for the most favorable conditions, assuming:

• using a base made of mild steel, serving as a magnetic yoke
• with a thickness of at least 10 mm
• with a surface cleaned and smooth
• with direct contact (without coatings)
• for force applied at a right angle (pull-off, not shear)
• at standard ambient temperature

What influences lifting capacity in practice

In real-world applications, the actual holding force depends on many variables, presented from the most important:

• Air gap (betwixt the magnet and the metal), since even a tiny distance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
• Angle of force application – highest force is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
• Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
• Steel grade – the best choice is pure iron steel. Hardened steels may generate lower lifting capacity.
• Surface finish – ideal contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
• Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under shearing force the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet and the plate lowers the load capacity.