LM TLN - 22 SQ / N38 - magnetic leviton

Pros as well as cons of rare earth magnets.

Apart from their superior magnetism, neodymium magnets have these key benefits:

• Their magnetic field is maintained, and after around ten years it drops only by ~1% (theoretically),
• They feature excellent resistance to magnetic field loss as a result of external magnetic sources,
• A magnet with a shiny silver surface has better aesthetics,
• The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
• Thanks to freedom in shaping and the capacity to adapt to individual projects,
• Key role in modern industrial fields – they find application in data components, motor assemblies, medical devices, as well as other advanced devices.
• Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Characteristics of disadvantages of neodymium magnets: tips and applications.

• To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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
• They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Due to limitations in realizing threads and complicated shapes in magnets, we propose using casing - magnetic mount.
• Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to be problematic in diagnostics medical in case of swallowing.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum holding power of the magnet – what contributes to it?

Information about lifting capacity is the result of a measurement for the most favorable conditions, including:

• using a plate made of high-permeability steel, serving as a circuit closing element
• whose thickness equals approx. 10 mm
• characterized by lack of roughness
• without any clearance between the magnet and steel
• for force applied at a right angle (pull-off, not shear)
• at standard ambient temperature

Practical lifting capacity: influencing factors

Bear in mind that the magnet holding will differ depending on the following factors, starting with the most relevant:

• Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
• Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
• Steel type – mild steel attracts best. Higher carbon content decrease magnetic permeability and lifting capacity.
• Base smoothness – the more even the surface, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
• Temperature – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

* Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a small distance {between} the magnet and the plate reduces the holding force.