AM ucho [M12] - magnetic accessories

Pros as well as cons of rare earth magnets.

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

• They retain magnetic properties for almost ten years – the drop is just ~1% (based on simulations),
• Magnets perfectly protect themselves against demagnetization caused by external fields,
• By using a lustrous coating of gold, the element presents an modern look,
• Magnetic induction on the top side of the magnet turns out to be extremely intense,
• Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
• Possibility of custom creating as well as adjusting to precise needs,
• Key role in modern industrial fields – they serve a role in computer drives, electric drive systems, precision medical tools, also multitasking production systems.
• Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages of neodymium magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, 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.
• Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in creating nuts and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
• Health risk to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small elements of these devices are able to complicate diagnosis medical in case of swallowing.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum lifting force for a neodymium magnet – what affects it?

Holding force of 480 kg is a theoretical maximum value executed under the following configuration:

• with the contact of a sheet made of low-carbon steel, ensuring maximum field concentration
• whose thickness reaches at least 10 mm
• with a surface perfectly flat
• under conditions of no distance (surface-to-surface)
• during pulling in a direction perpendicular to the mounting surface
• in temp. approx. 20°C

Lifting capacity in real conditions – factors

Please note that the magnet holding will differ depending on the following factors, in order of importance:

• Clearance – existence of any layer (paint, tape, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
• Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
• Steel type – low-carbon steel attracts best. Alloy admixtures lower magnetic properties and lifting capacity.
• Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
• Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a small distance {between} the magnet’s surface and the plate reduces the load capacity.