FM Ruszt magnetyczny do leja fi 200 jednopoziomowy / N52 - magnetic filter

Strengths and weaknesses of rare earth magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• Their magnetic field is maintained, and after approximately ten years it drops only by ~1% (according to research),
• Neodymium magnets prove to be highly resistant to magnetic field loss caused by external interference,
• The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
• The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Thanks to flexibility in shaping and the ability to modify to individual projects,
• Significant place in electronics industry – they are used in magnetic memories, drive modules, advanced medical instruments, and multitasking production systems.
• Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

• To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can lose their strength 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 advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
• We recommend cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex forms.
• Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical when they are in the body.
• Due to complex production process, their price is relatively high,

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Magnet power is the result of a measurement for optimal configuration, taking into account:

• on a plate made of structural steel, effectively closing the magnetic field
• possessing a massiveness of min. 10 mm to ensure full flux closure
• with a surface free of scratches
• without the slightest insulating layer between the magnet and steel
• for force acting at a right angle (in the magnet axis)
• at conditions approx. 20°C

Determinants of lifting force in real conditions

Please note that the application force will differ subject to the following factors, starting with the most relevant:

• Clearance – the presence of any layer (rust, dirt, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
• Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of maximum force).
• Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
• Material composition – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
• Surface finish – ideal contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
• Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

* Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate reduces the lifting capacity.