UMGB 67x28 [M8+M10] GW F 120+ Lina GOBLIN / N38 - goblin magnetic holder

Pros as well as cons of neodymium magnets.

Apart from their consistent holding force, neodymium magnets have these key benefits:

• Their power remains stable, and after approximately 10 years it decreases only by ~1% (theoretically),
• Magnets perfectly protect themselves against loss of magnetization caused by external fields,
• Thanks to the smooth finish, the layer of nickel, gold, or silver gives an modern appearance,
• They feature high magnetic induction at the operating surface, which increases their power,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
• In view of the option of free forming and customization to specialized projects, magnetic components can be produced in a wide range of forms and dimensions, which amplifies use scope,
• Fundamental importance in innovative solutions – they are used in mass storage devices, electric motors, medical equipment, and industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in small systems

Disadvantages of NdFeB magnets:

• At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's 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.
• They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Due to limitations in realizing nuts and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
• Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these magnets can be problematic in diagnostics medical in case of swallowing.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

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

The specified lifting capacity represents the maximum value, obtained under optimal environment, specifically:

• with the application of a yoke made of low-carbon steel, guaranteeing maximum field concentration
• possessing a massiveness of minimum 10 mm to ensure full flux closure
• characterized by even structure
• under conditions of no distance (metal-to-metal)
• during detachment in a direction vertical to the mounting surface
• at room temperature

Practical aspects of lifting capacity – factors

Please note that the magnet holding may be lower influenced by the following factors, starting with the most relevant:

• Clearance – existence of any layer (rust, dirt, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
• Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
• Steel thickness – too thin plate does not close the flux, causing part of the power to be escaped to the other side.
• Material type – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
• Surface finish – ideal contact is possible only on polished steel. Rough texture create air cushions, reducing force.
• Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

* Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a slight gap {between} the magnet’s surface and the plate decreases the lifting capacity.