UMGB 75x28 [M8+M10] GW F200 +Lina GOBLIN / N38 - goblin magnetic holder

Strengths and weaknesses of NdFeB magnets.

Besides their immense strength, neodymium magnets offer the following advantages:

• They retain magnetic properties for around 10 years – the drop is just ~1% (according to analyses),
• Neodymium magnets are highly resistant to demagnetization caused by external magnetic fields,
• A magnet with a shiny gold surface has an effective appearance,
• The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
• Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of exact creating as well as adjusting to concrete requirements,
• Versatile presence in modern industrial fields – they are utilized in mass storage devices, brushless drives, diagnostic systems, as well as multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in small systems

Drawbacks and weaknesses of neodymium magnets: tips and applications.

• At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
• We warn that neodymium magnets can lose their strength 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 magnets in rubber or plastics, which secure oxidation and corrosion.
• We suggest casing - magnetic mount, due to difficulties in creating threads inside the magnet and complex shapes.
• Health risk to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these products are able to be problematic in diagnostics medical after entering the body.
• High unit price – neodymium magnets cost more 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?

Breakaway force is the result of a measurement for the most favorable conditions, including:

• on a block made of mild steel, optimally conducting the magnetic flux
• whose thickness is min. 10 mm
• with a surface cleaned and smooth
• with zero gap (no impurities)
• during detachment in a direction vertical to the mounting surface
• at ambient temperature room level

Key elements affecting lifting force

In real-world applications, the real power results from a number of factors, listed from crucial:

• Clearance – the presence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
• Load vector – highest force is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
• Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Plate material – mild steel gives the best results. Alloy admixtures reduce magnetic permeability and lifting capacity.
• Plate texture – smooth surfaces ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
• Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

* Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the holding force is lower. In addition, even a minimal clearance {between} the magnet and the plate reduces the load capacity.