SMZR 25x225 / N52 - magnetic separator with handle

Advantages and disadvantages of NdFeB magnets.

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

• They retain magnetic properties for almost ten years – the drop is just ~1% (according to analyses),
• Magnets very well protect themselves against demagnetization caused by foreign field sources,
• A magnet with a smooth silver surface has better aesthetics,
• Magnets are distinguished by exceptionally strong magnetic induction on the working surface,
• Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of exact shaping as well as modifying to precise needs,
• Versatile presence in modern industrial fields – they are commonly used in data components, electromotive mechanisms, advanced medical instruments, and multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in miniature devices

What to avoid - cons of neodymium magnets: tips and applications.

• They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
• 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 stability even at temperatures up to 230°C
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
• We recommend cover - magnetic holder, due to difficulties in realizing threads inside the magnet and complicated shapes.
• Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these magnets can complicate diagnosis medical after entering the body.
• Due to complex production process, their price exceeds standard values,

Maximum lifting force for a neodymium magnet – what affects it?

The lifting capacity listed is a result of laboratory testing executed under specific, ideal conditions:

• on a plate made of mild steel, effectively closing the magnetic field
• whose thickness is min. 10 mm
• characterized by even structure
• with direct contact (no paint)
• during detachment in a direction perpendicular to the plane
• at standard ambient temperature

Lifting capacity in real conditions – factors

Real force is influenced by working environment parameters, such as (from most important):

• Distance – existence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Angle of force application – maximum parameter is reached only during perpendicular pulling. The resistance to sliding of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
• Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
• Steel grade – the best choice is pure iron steel. Stainless steels may generate lower lifting capacity.
• Base smoothness – the more even the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
• Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.