SM 32x150 [2xM8] / N52 - magnetic separator

Pros and cons of rare earth magnets.

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

• They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
• They do not lose their magnetic properties even under external field action,
• In other words, due to the metallic layer of silver, the element gains a professional look,
• The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Thanks to flexibility in shaping and the ability to adapt to unusual requirements,
• Significant place in modern technologies – they are utilized in mass storage devices, drive modules, diagnostic systems, as well as technologically advanced constructions.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons of neodymium magnets: weaknesses and usage proposals

• They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• Due to limitations in producing nuts and complicated shapes in magnets, we recommend using casing - magnetic mount.
• Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to disrupt the diagnostic process medical after entering the body.
• Due to expensive raw materials, their price exceeds standard values,

Highest magnetic holding force – what affects it?

The force parameter is a theoretical maximum value executed under specific, ideal conditions:

• on a block made of mild steel, perfectly concentrating the magnetic field
• with a cross-section no less than 10 mm
• with an polished touching surface
• under conditions of no distance (surface-to-surface)
• during detachment in a direction vertical to the plane
• at standard ambient temperature

Lifting capacity in practice – influencing factors

Bear in mind that the application force may be lower depending on elements below, starting with the most relevant:

• Distance (betwixt the magnet and the metal), as even a very small distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
• Material composition – not every steel attracts identically. High carbon content weaken the interaction with the magnet.
• Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
• Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the holding force is lower. Additionally, even a small distance {between} the magnet’s surface and the plate lowers the load capacity.