SM 32x350 [2xM8] / N52 - magnetic separator

Pros and cons of NdFeB magnets.

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

• They do not lose power, even after nearly ten years – the decrease in power is only ~1% (theoretically),
• They do not lose their magnetic properties even under close interference source,
• The use of an refined finish of noble metals (nickel, gold, silver) causes the element to present itself better,
• Neodymium magnets ensure maximum magnetic induction on a small surface, which ensures high operational effectiveness,
• Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to the possibility of accurate shaping and customization to custom solutions, NdFeB magnets can be manufactured in a broad palette of shapes and sizes, which makes them more universal,
• Key role in innovative solutions – they are used in data components, motor assemblies, advanced medical instruments, as well as technologically advanced constructions.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• We warn that neodymium magnets can reduce their strength 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 rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• We suggest casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complex shapes.
• Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these devices can be problematic in diagnostics medical when they are in the body.
• 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 contributes to it?

Holding force of 0 kg is a result of laboratory testing executed under specific, ideal conditions:

• on a base made of mild steel, effectively closing the magnetic flux
• with a cross-section no less than 10 mm
• with an polished touching surface
• with zero gap (without impurities)
• for force acting at a right angle (in the magnet axis)
• at standard ambient temperature

Lifting capacity in real conditions – factors

In practice, the actual lifting capacity results from several key aspects, listed from the most important:

• Clearance – existence of any layer (paint, dirt, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Angle of force application – highest force is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
• Base massiveness – insufficiently thick plate does not accept the full field, causing part of the flux to be wasted to the other side.
• Material type – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
• Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
• Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance {between} the magnet and the plate reduces the load capacity.