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

Pros as well as cons of NdFeB magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

• They have unchanged lifting capacity, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
• They feature excellent resistance to magnetism drop as a result of opposing magnetic fields,
• In other words, due to the glossy layer of nickel, the element is aesthetically pleasing,
• Neodymium magnets ensure maximum magnetic induction on a small area, which increases force concentration,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Thanks to flexibility in forming and the ability to customize to individual projects,
• Universal use in high-tech industry – they serve a role in magnetic memories, drive modules, medical equipment, and complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in miniature devices

Cons of neodymium magnets: application proposals

• Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
• We warn that neodymium magnets can lose 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 usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
• Due to limitations in producing nuts and complex forms in magnets, we propose using cover - magnetic mount.
• Health risk resulting from small fragments of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
• With budget limitations the cost of neodymium magnets is a challenge,

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

The lifting capacity listed is a theoretical maximum value conducted under specific, ideal conditions:

• using a sheet made of low-carbon steel, functioning as a magnetic yoke
• with a cross-section of at least 10 mm
• with an polished contact surface
• with zero gap (no impurities)
• for force applied at a right angle (pull-off, not shear)
• at temperature room level

Lifting capacity in real conditions – factors

It is worth knowing that the application force may be lower influenced by elements below, starting with the most relevant:

• Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
• Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
• Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
• Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
• Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
• Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently damage the magnet.

* Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet’s surface and the plate reduces the holding force.