SMZR 25x150 / N52 - magnetic separator with handle

Pros as well as cons of neodymium magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They retain full power for almost ten years – the drop is just ~1% (according to analyses),
• They possess excellent resistance to magnetism drop when exposed to opposing magnetic fields,
• Thanks to the metallic finish, the coating of nickel, gold, or silver-plated gives an modern appearance,
• Magnetic induction on the surface of the magnet turns out to be extremely intense,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
• Possibility of individual modeling as well as adapting to complex needs,
• Key role in electronics industry – they are utilized in mass storage devices, electric drive systems, precision medical tools, as well as other advanced devices.
• Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Cons of neodymium magnets: tips and applications.

• Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also raises their durability
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 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
• Due to limitations in realizing nuts and complex forms in magnets, we recommend using cover - magnetic holder.
• Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. It is also worth noting that small elements of these magnets are able to complicate diagnosis medical after entering the body.
• Due to neodymium price, their price is relatively high,

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

The declared magnet strength concerns the peak performance, obtained under optimal environment, specifically:

• using a plate made of mild steel, acting as a ideal flux conductor
• whose transverse dimension is min. 10 mm
• characterized by even structure
• with total lack of distance (no coatings)
• during detachment in a direction perpendicular to the plane
• at temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Please note that the magnet holding will differ subject to the following factors, in order of importance:

• Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
• Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal 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.
• Plate material – mild steel gives the best results. Alloy steels lower magnetic permeability and holding force.
• Surface condition – ground elements guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
• Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was determined with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap {between} the magnet’s surface and the plate reduces the holding force.