RM R8 ULTRA - 13000 Gs / N52 - magnetic distributor

Advantages as well as disadvantages of neodymium magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

• They do not lose power, even after approximately ten years – the drop in power is only ~1% (theoretically),
• They have excellent resistance to magnetic field loss as a result of opposing magnetic fields,
• A magnet with a metallic gold surface has better aesthetics,
• Magnetic induction on the top side of the magnet is maximum,
• 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 modularity in forming and the ability to adapt to unusual requirements,
• Universal use in electronics industry – they are used in computer drives, drive modules, medical equipment, also industrial machines.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest 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 those in rubber or plastics, which secure oxidation as well as corrosion.
• Limited possibility of making nuts in the magnet and complex forms - recommended is cover - magnet mounting.
• Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. Additionally, small components of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Optimal lifting capacity of a neodymium magnet – what it depends on?

The lifting capacity listed is a result of laboratory testing performed under specific, ideal conditions:

• using a sheet made of mild steel, functioning as a magnetic yoke
• possessing a massiveness of min. 10 mm to avoid saturation
• characterized by even structure
• under conditions of ideal adhesion (surface-to-surface)
• under axial application of breakaway force (90-degree angle)
• at ambient temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Holding efficiency impacted by specific conditions, including (from most important):

• Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
• Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
• Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
• Metal type – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
• Plate texture – ground elements ensure maximum contact, which improves force. Rough surfaces weaken the grip.
• Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a slight gap {between} the magnet’s surface and the plate lowers the lifting capacity.