MPL 40x18x10 SH / N38 - lamellar magnet

Pros and cons of neodymium magnets.

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

• They do not lose power, even during around ten years – the reduction in power is only ~1% (based on measurements),
• They show high resistance to demagnetization induced by external field influence,
• In other words, due to the smooth surface of silver, the element becomes visually attractive,
• Neodymium magnets achieve maximum magnetic induction on a contact point, which ensures high operational effectiveness,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
• Thanks to modularity in constructing and the ability to adapt to individual projects,
• Significant place in advanced technology sectors – they are used in mass storage devices, brushless drives, diagnostic systems, also technologically advanced constructions.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

What to avoid - cons of neodymium magnets: tips and applications.

• To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
• NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
• Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• We suggest a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex shapes.
• Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, small components of these magnets are able to complicate diagnosis medical when they are in the body.
• With mass production the cost of neodymium magnets can be a barrier,

Best holding force of the magnet in ideal parameters – what it depends on?

The load parameter shown refers to the peak performance, recorded under laboratory conditions, meaning:

• on a plate made of mild steel, optimally conducting the magnetic flux
• with a thickness no less than 10 mm
• characterized by lack of roughness
• with zero gap (no coatings)
• for force acting at a right angle (pull-off, not shear)
• in stable room temperature

Key elements affecting lifting force

During everyday use, the actual holding force results from a number of factors, presented from the most important:

• Gap (betwixt the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to varnish, rust or debris).
• Direction of force – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
• Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
• Plate material – low-carbon steel gives the best results. Alloy admixtures reduce magnetic permeability and lifting capacity.
• Smoothness – full contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
• Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity was measured with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance {between} the magnet and the plate lowers the lifting capacity.