SM 32x125 [2xM8] / N52 - magnetic separator

Strengths and weaknesses of neodymium magnets.

Apart from their consistent power, neodymium magnets have these key benefits:

• They retain full power for around 10 years – the drop is just ~1% (based on simulations),
• They feature excellent resistance to magnetic field loss when exposed to opposing magnetic fields,
• A magnet with a shiny silver surface has better aesthetics,
• Magnets have impressive magnetic induction on the working surface,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
• Considering the possibility of flexible forming and customization to unique needs, magnetic components can be created in a variety of forms and dimensions, which amplifies use scope,
• Huge importance in high-tech industry – they serve a role in mass storage devices, electromotive mechanisms, medical equipment, and industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in miniature devices

Drawbacks and weaknesses of neodymium magnets: tips and applications.

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Due to limitations in producing nuts and complicated forms in magnets, we recommend using cover - magnetic mechanism.
• Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. Furthermore, small elements of these magnets can complicate diagnosis medical when they are in the body.
• With mass production the cost of neodymium magnets is economically unviable,

Breakaway strength of the magnet in ideal conditions – what it depends on?

The declared magnet strength concerns the maximum value, measured under laboratory conditions, specifically:

• with the contact of a yoke made of special test steel, ensuring full magnetic saturation
• with a thickness of at least 10 mm
• characterized by even structure
• without any insulating layer between the magnet and steel
• under vertical application of breakaway force (90-degree angle)
• in stable room temperature

What influences lifting capacity in practice

Bear in mind that the application force will differ depending on elements below, starting with the most relevant:

• Gap (betwixt the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
• Direction of force – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
• Plate thickness – too thin plate causes magnetic saturation, causing part of the flux to be wasted into the air.
• Chemical composition of the base – mild steel attracts best. Higher carbon content lower magnetic permeability and holding force.
• Surface quality – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
• Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet’s surface and the plate reduces the holding force.