KM HF - 22 kg - magnetic bracket

Pros and cons of neodymium magnets.

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

• Their power is durable, and after around ten years it decreases only by ~1% (theoretically),
• Neodymium magnets prove to be extremely resistant to demagnetization caused by external field sources,
• The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to look better,
• Magnetic induction on the surface of the magnet remains strong,
• Neodymium magnets are characterized by very 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 designing and the capacity to modify to individual projects,
• Key role in advanced technology sectors – they serve a role in data components, electromotive mechanisms, medical equipment, and technologically advanced constructions.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Drawbacks and weaknesses of neodymium magnets: application proposals

• At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
• Due to limitations in producing threads and complicated shapes in magnets, we recommend using a housing - magnetic holder.
• Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, small elements of these products are able to disrupt the diagnostic process medical after entering the body.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

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

The force parameter is a theoretical maximum value executed under specific, ideal conditions:

• using a plate made of high-permeability steel, serving as a magnetic yoke
• with a thickness minimum 10 mm
• with an ground contact surface
• under conditions of no distance (metal-to-metal)
• for force acting at a right angle (pull-off, not shear)
• in neutral thermal conditions

What influences lifting capacity in practice

In real-world applications, the actual holding force results from many variables, presented from most significant:

• Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
• Direction of force – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
• Plate thickness – insufficiently thick steel does not close the flux, causing part of the power to be escaped to the other side.
• Steel type – low-carbon steel gives the best results. Higher carbon content decrease magnetic properties and lifting capacity.
• Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
• Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under shearing force the holding force is lower. Moreover, even a minimal clearance {between} the magnet’s surface and the plate decreases the lifting capacity.