SM 32x350 [2xM8] / N52 - magnetic separator

Strengths as well as weaknesses of neodymium magnets.

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

• They do not lose strength, even over nearly ten years – the decrease in power is only ~1% (based on measurements),
• They have excellent resistance to magnetic field loss as a result of external fields,
• By covering with a shiny layer of silver, the element has an modern look,
• Magnets are distinguished by very high magnetic induction on the outer layer,
• 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...
• In view of the potential of free forming and customization to custom needs, neodymium magnets can be modeled in a broad palette of geometric configurations, which amplifies use scope,
• Significant place in modern industrial fields – they are utilized in magnetic memories, brushless drives, diagnostic systems, and other advanced devices.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also raises their durability
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• We recommend cover - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated shapes.
• Health risk to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. Furthermore, small components of these devices can disrupt the diagnostic process medical in case of swallowing.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Detachment force of the magnet in optimal conditions – what contributes to it?

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

• on a plate made of mild steel, perfectly concentrating the magnetic field
• with a thickness no less than 10 mm
• with a plane cleaned and smooth
• under conditions of ideal adhesion (surface-to-surface)
• during pulling in a direction perpendicular to the plane
• at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Bear in mind that the working load may be lower subject to elements below, in order of importance:

• Clearance – existence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
• 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.
• Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
• Steel grade – the best choice is high-permeability steel. Cast iron may attract less.
• Surface finish – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
• Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

* Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a small distance {between} the magnet’s surface and the plate reduces the holding force.