UMGB 75x28 [M10x3] GW F200 PLATINIUM + Lina GOBLIN / N52 - goblin magnetic holder

Advantages as well as disadvantages of neodymium magnets.

Apart from their strong magnetism, neodymium magnets have these key benefits:

• They have stable power, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
• Magnets very well defend themselves against demagnetization caused by external fields,
• In other words, due to the smooth layer of silver, the element becomes visually attractive,
• Magnets are distinguished by excellent magnetic induction on the active area,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
• Thanks to modularity in forming and the ability to adapt to individual projects,
• Fundamental importance in future technologies – they are utilized in data components, brushless drives, diagnostic systems, as well as multitasking production systems.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons of neodymium magnets: weaknesses and usage proposals

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
• NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and 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 magnets in rubber or plastics, which prevent oxidation and corrosion.
• Due to limitations in creating threads and complex forms in magnets, we propose using a housing - magnetic holder.
• Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Furthermore, small elements of these magnets are able to be problematic in diagnostics medical in case of swallowing.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Maximum holding power of the magnet – what contributes to it?

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

• using a sheet made of low-carbon steel, functioning as a magnetic yoke
• with a thickness of at least 10 mm
• with an polished contact surface
• without the slightest clearance between the magnet and steel
• during pulling in a direction vertical to the plane
• at ambient temperature room level

Magnet lifting force in use – key factors

Please note that the application force will differ depending on elements below, in order of importance:

• Distance – existence of foreign body (paint, tape, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
• Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Plate thickness – too thin plate does not accept the full field, causing part of the flux to be escaped into the air.
• Metal type – different alloys attracts identically. High carbon content worsen the attraction effect.
• Surface finish – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
• Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the holding force.