NC kulka fi 2 cale / N52 - neocube

Pros as well as cons of NdFeB magnets.

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

• Their magnetic field is durable, and after around ten years it decreases only by ~1% (according to research),
• They do not lose their magnetic properties even under external field action,
• Thanks to the shiny finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an visually attractive appearance,
• Magnets are distinguished by huge magnetic induction on the outer side,
• Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
• Due to the potential of precise shaping and adaptation to custom solutions, neodymium magnets can be produced in a wide range of forms and dimensions, which makes them more universal,
• Key role in advanced technology sectors – they serve a role in data components, electric motors, precision medical tools, also other advanced devices.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals

• At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
• Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 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 immune to moisture, in case of application outdoors
• Limited possibility of creating threads in the magnet and complex shapes - recommended is a housing - mounting mechanism.
• Potential hazard related to microscopic parts of magnets are risky, if swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these products can be problematic in diagnostics medical after entering the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Breakaway strength of the magnet in ideal conditions – what affects it?

Information about lifting capacity is the result of a measurement for optimal configuration, taking into account:

• using a sheet made of high-permeability steel, serving as a circuit closing element
• with a thickness minimum 10 mm
• with a plane free of scratches
• under conditions of no distance (metal-to-metal)
• for force acting at a right angle (pull-off, not shear)
• in neutral thermal conditions

Magnet lifting force in use – key factors

During everyday use, the actual lifting capacity is determined by a number of factors, presented from crucial:

• Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of nominal force).
• Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
• Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
• Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
• Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance {between} the magnet and the plate lowers the lifting capacity.