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

Strengths and weaknesses of rare earth magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• Their strength remains stable, and after approximately ten years it drops only by ~1% (according to research),
• They feature excellent resistance to weakening of magnetic properties when exposed to external fields,
• In other words, due to the reflective finish of gold, the element gains visual value,
• They feature high magnetic induction at the operating surface, which improves attraction properties,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• In view of the option of precise molding and adaptation to unique requirements, NdFeB magnets can be produced in a broad palette of forms and dimensions, which amplifies use scope,
• Key role in electronics industry – they are used in data components, drive modules, medical devices, as well as modern systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves 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.
• Magnets exposed to a humid environment can rust. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• We recommend cover - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated shapes.
• Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small components of these devices can disrupt the diagnostic process medical after entering the body.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Highest magnetic holding force – what affects it?

The specified lifting capacity represents the peak performance, obtained under optimal environment, namely:

• using a sheet made of low-carbon steel, acting as a ideal flux conductor
• possessing a massiveness of at least 10 mm to ensure full flux closure
• with an polished contact surface
• under conditions of gap-free contact (metal-to-metal)
• during pulling in a direction perpendicular to the mounting surface
• at standard ambient temperature

Impact of factors on magnetic holding capacity in practice

In practice, the actual lifting capacity is determined by several key aspects, presented from the most important:

• Clearance – existence of any layer (paint, tape, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
• Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
• Plate thickness – too thin steel does not close the flux, causing part of the power to be wasted into the air.
• Steel type – low-carbon steel gives the best results. Alloy admixtures decrease magnetic permeability and holding force.
• Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
• Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a small distance {between} the magnet’s surface and the plate decreases the holding force.