SM 32x375 [2xM8] / N52 - magnetic separator

Pros and cons of neodymium magnets.

Apart from their consistent power, neodymium magnets have these key benefits:

• They do not lose power, even during approximately ten years – the reduction in power is only ~1% (according to tests),
• They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
• The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
• Neodymium magnets generate maximum magnetic induction on a their surface, which increases force concentration,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Possibility of precise creating as well as adapting to complex needs,
• Significant place in innovative solutions – they serve a role in magnetic memories, brushless drives, precision medical tools, and multitasking production 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 suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
• Neodymium magnets decrease their force 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 suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
• Limited ability of creating nuts in the magnet and complex shapes - recommended is cover - magnetic holder.
• Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these magnets can be problematic in diagnostics medical when they are in the body.
• With large orders the cost of neodymium magnets can be a barrier,

Optimal lifting capacity of a neodymium magnet – what contributes to it?

The force parameter is a measurement result performed under the following configuration:

• with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
• possessing a thickness of at least 10 mm to avoid saturation
• with a surface cleaned and smooth
• under conditions of no distance (surface-to-surface)
• during pulling in a direction perpendicular to the plane
• at ambient temperature room level

Determinants of lifting force in real conditions

Holding efficiency impacted by specific conditions, including (from most important):

• Distance – existence of any layer (paint, dirt, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
• Load vector – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
• Steel grade – ideal substrate is high-permeability steel. Hardened steels may generate lower lifting capacity.
• Surface structure – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
• Temperature – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.

* Lifting capacity was assessed by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the lifting capacity is smaller. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.