UMP 75x25 [M10x3] GW F200 GOLD DUAL Lina / N42 - search holder

Strengths and weaknesses of neodymium magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• They retain full power for nearly ten years – the drop is just ~1% (according to analyses),
• They possess excellent resistance to magnetic field loss due to opposing magnetic fields,
• By applying a reflective layer of nickel, the element presents an proper look,
• Neodymium magnets ensure maximum magnetic induction on a small surface, which increases force concentration,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• Thanks to versatility in designing and the capacity to modify to complex applications,
• Key role in advanced technology sectors – they are used in computer drives, motor assemblies, medical equipment, also technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in miniature devices

Disadvantages of NdFeB magnets:

• At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's 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
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
• Due to limitations in creating threads and complicated shapes in magnets, we propose using casing - magnetic holder.
• Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small components of these devices can complicate diagnosis medical in case of swallowing.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Maximum lifting capacity of the magnet – what affects it?

The specified lifting capacity represents the maximum value, recorded under optimal environment, meaning:

• using a plate made of high-permeability steel, serving as a circuit closing element
• with a cross-section no less than 10 mm
• with an polished contact surface
• under conditions of no distance (metal-to-metal)
• during pulling in a direction vertical to the plane
• at conditions approx. 20°C

Magnet lifting force in use – key factors

During everyday use, the real power is determined by many variables, ranked from crucial:

• Distance (between the magnet and the metal), as even a very small clearance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to paint, corrosion or dirt).
• Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
• Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
• Plate texture – ground elements ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
• Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet and the plate lowers the holding force.