AM lina fi 10 mm - magnetic accessories

Strengths as well as weaknesses of NdFeB magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
• They retain their magnetic properties even under strong external field,
• Thanks to the shimmering finish, the coating of nickel, gold, or silver gives an modern appearance,
• The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• In view of the option of flexible forming and customization to custom solutions, NdFeB magnets can be manufactured in a variety of shapes and sizes, which makes them more universal,
• Huge importance in modern technologies – they are used in HDD drives, motor assemblies, diagnostic systems, also industrial machines.
• Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages of neodymium magnets:

• At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• Neodymium magnets lose their strength 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
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
• We suggest casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated forms.
• Health risk related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these devices can be problematic in diagnostics medical when they are in the body.
• With large orders the cost of neodymium magnets can be a barrier,

Magnetic strength at its maximum – what affects it?

Holding force of 1592 kg is a theoretical maximum value executed under the following configuration:

• using a plate made of mild steel, functioning as a ideal flux conductor
• whose thickness reaches at least 10 mm
• with an ideally smooth contact surface
• under conditions of no distance (surface-to-surface)
• under vertical force direction (90-degree angle)
• at temperature room level

Lifting capacity in practice – influencing factors

Real force is influenced by working environment parameters, such as (from most important):

• Gap (betwixt the magnet and the plate), as even a microscopic clearance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to paint, corrosion or dirt).
• Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
• 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.
• Metal type – not every steel attracts identically. Alloy additives weaken the attraction effect.
• Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
• Temperature – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, in contrast under shearing force the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance {between} the magnet and the plate reduces the lifting capacity.