SM 32x150 [2xM8] / N52 - magnetic separator

Strengths as well as weaknesses of NdFeB magnets.

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:

• They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (according to literature),
• They maintain their magnetic properties even under strong external field,
• By covering with a decorative coating of silver, the element acquires an nice look,
• Magnets possess huge magnetic induction on the surface,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Due to the potential of accurate forming and customization to specialized solutions, magnetic components can be produced in a variety of geometric configurations, which expands the range of possible applications,
• Key role in modern industrial fields – they are commonly used in magnetic memories, electromotive mechanisms, precision medical tools, and multitasking production systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of neodymium magnets:

• To avoid cracks under impact, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
• Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• We suggest casing - magnetic holder, due to difficulties in creating threads inside the magnet and complex shapes.
• Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that small components of these devices can be problematic in diagnostics medical in case of swallowing.
• With large orders the cost of neodymium magnets is a challenge,

Maximum lifting force for a neodymium magnet – what contributes to it?

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

• on a plate made of structural steel, perfectly concentrating the magnetic flux
• with a cross-section no less than 10 mm
• with an polished contact surface
• under conditions of no distance (metal-to-metal)
• during pulling in a direction perpendicular to the plane
• at standard ambient temperature

Key elements affecting lifting force

During everyday use, the actual lifting capacity depends on several key aspects, ranked from most significant:

• Gap between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
• Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
• Plate thickness – too thin plate does not close the flux, causing part of the power to be wasted into the air.
• Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
• Smoothness – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
• Thermal environment – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

* Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap {between} the magnet’s surface and the plate reduces the lifting capacity.