AM ucho [M12] - magnetic accessories

Advantages as well as disadvantages of rare earth magnets.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

• They do not lose magnetism, even during around ten years – the reduction in strength is only ~1% (according to tests),
• They possess excellent resistance to magnetic field loss as a result of external magnetic sources,
• The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to look better,
• 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 form) even at high temperatures reaching 230°C or more...
• Considering the ability of free shaping and customization to specialized needs, magnetic components can be manufactured in a wide range of geometric configurations, which expands the range of possible applications,
• Wide application in future technologies – they serve a role in data components, electric motors, medical devices, also multitasking production systems.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
• Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Due to limitations in creating threads and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
• Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these products can disrupt the diagnostic process medical after entering the body.
• Due to complex production process, their price exceeds standard values,

Maximum lifting capacity of the magnet – what affects it?

Magnet power was determined for ideal contact conditions, including:

• on a base made of structural steel, optimally conducting the magnetic field
• with a cross-section no less than 10 mm
• with a plane cleaned and smooth
• without any clearance between the magnet and steel
• during detachment in a direction vertical to the plane
• at room temperature

Determinants of lifting force in real conditions

Please note that the magnet holding will differ influenced by elements below, starting with the most relevant:

• Clearance – existence of any layer (rust, tape, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
• Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of nominal force).
• Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
• Steel type – mild steel attracts best. Higher carbon content decrease magnetic properties and holding force.
• Surface finish – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
• Thermal factor – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a small distance {between} the magnet and the plate reduces the load capacity.