UMP 75x24 [M8+M10] GW F 200 kg - search holder

Pros as well as cons of NdFeB magnets.

Besides their exceptional pulling force, neodymium magnets offer the following advantages:

• They do not lose power, even after nearly 10 years – the drop in power is only ~1% (theoretically),
• They are extremely resistant to demagnetization induced by external magnetic fields,
• By using a decorative layer of nickel, the element gains an professional look,
• Neodymium magnets achieve maximum magnetic induction on a small surface, which ensures high operational effectiveness,
• Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to modularity in shaping and the ability to customize to complex applications,
• Wide application in modern industrial fields – they are used in HDD drives, electric motors, diagnostic systems, also other advanced devices.
• Thanks to their power density, small magnets offer high operating force, in miniature format,

Characteristics of disadvantages of neodymium magnets and ways of using them

• To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
• When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• 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 secure oxidation and corrosion.
• We recommend cover - magnetic mount, due to difficulties in realizing threads inside the magnet and complex shapes.
• Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these devices can be problematic in diagnostics medical when they are in the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum holding power of the magnet – what affects it?

Magnet power was defined for optimal configuration, including:

• using a base made of low-carbon steel, serving as a ideal flux conductor
• with a thickness minimum 10 mm
• with an ideally smooth touching surface
• under conditions of ideal adhesion (surface-to-surface)
• under vertical force vector (90-degree angle)
• at temperature room level

Impact of factors on magnetic holding capacity in practice

Holding efficiency impacted by working environment parameters, mainly (from most important):

• Air gap (between the magnet and the plate), as even a tiny distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, rust or dirt).
• Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of nominal force).
• Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
• Material composition – not every steel attracts identically. High carbon content weaken the interaction with the magnet.
• Smoothness – ideal contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
• Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a slight gap {between} the magnet’s surface and the plate lowers the holding force.