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

Pros and cons of rare earth magnets.

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

• They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
• Neodymium magnets prove to be extremely resistant to demagnetization caused by external field sources,
• A magnet with a metallic silver surface looks better,
• Magnets exhibit excellent magnetic induction on the working surface,
• 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...
• Considering the ability of accurate molding and adaptation to specialized needs, neodymium magnets can be modeled in a wide range of forms and dimensions, which expands the range of possible applications,
• Key role in modern technologies – they find application in hard drives, drive modules, diagnostic systems, and multitasking production systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of neodymium magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
• Due to limitations in realizing nuts and complex forms in magnets, we propose using cover - magnetic mechanism.
• Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these magnets are able to complicate diagnosis medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum holding power of the magnet – what it depends on?

Holding force of 0 kg is a result of laboratory testing performed under standard conditions:

• on a plate made of structural steel, optimally conducting the magnetic flux
• whose thickness equals approx. 10 mm
• characterized by lack of roughness
• under conditions of gap-free contact (surface-to-surface)
• during pulling in a direction perpendicular to the plane
• in temp. approx. 20°C

Practical lifting capacity: influencing factors

During everyday use, the actual holding force results from a number of factors, ranked from the most important:

• Clearance – the presence of foreign body (paint, dirt, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
• Load vector – highest force is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
• Material type – ideal substrate is high-permeability steel. Cast iron may have worse magnetic properties.
• Surface finish – full contact is obtained only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
• Temperature – heating the magnet causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the holding force is lower. Additionally, even a small distance {between} the magnet and the plate reduces the holding force.