SM 32x475 [2xM8] / N42 - magnetic separator

Strengths as well as weaknesses of NdFeB magnets.

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

• Their power is durable, and after approximately ten years it decreases only by ~1% (according to research),
• They are resistant to demagnetization induced by external disturbances,
• A magnet with a smooth gold surface looks better,
• The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Thanks to the option of free molding and adaptation to custom solutions, magnetic components can be produced in a wide range of geometric configurations, which expands the range of possible applications,
• Significant place in modern industrial fields – they serve a role in magnetic memories, drive modules, medical devices, also modern systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of neodymium magnets:

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
• We warn that neodymium magnets can lose their strength 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 realizing threads and complicated shapes in magnets, we recommend using a housing - magnetic mechanism.
• Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these devices are able to complicate diagnosis medical after entering the body.
• With mass production the cost of neodymium magnets is economically unviable,

Maximum magnetic pulling force – what affects it?

The declared magnet strength refers to the peak performance, measured under ideal test conditions, meaning:

• with the application of a sheet made of special test steel, ensuring maximum field concentration
• whose thickness equals approx. 10 mm
• with a surface free of scratches
• with total lack of distance (no impurities)
• under vertical force vector (90-degree angle)
• at conditions approx. 20°C

What influences lifting capacity in practice

In real-world applications, the actual holding force depends on a number of factors, ranked from crucial:

• Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
• Angle of force application – highest force is reached only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
• Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
• Surface condition – ground elements ensure maximum contact, which increases force. Uneven metal weaken the grip.
• Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a slight gap {between} the magnet’s surface and the plate lowers the lifting capacity.