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

Pros and cons of NdFeB magnets.

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

• They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
• Magnets effectively resist against demagnetization caused by foreign field sources,
• By applying a shiny coating of gold, the element gains an aesthetic look,
• The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
• Due to the option of free shaping and adaptation to unique needs, NdFeB magnets can be produced in a broad palette of shapes and sizes, which increases their versatility,
• Huge importance in advanced technology sectors – they serve a role in hard drives, motor assemblies, diagnostic systems, and other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in compact constructions

Disadvantages of NdFeB magnets:

• Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Limited possibility of making threads in the magnet and complex forms - recommended is casing - mounting mechanism.
• Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Additionally, small components of these products can be problematic in diagnostics medical in case of swallowing.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Maximum lifting capacity of the magnet – what contributes to it?

The load parameter shown represents the maximum value, measured under optimal environment, meaning:

• on a block made of structural steel, effectively closing the magnetic field
• with a thickness of at least 10 mm
• characterized by lack of roughness
• without the slightest insulating layer between the magnet and steel
• under vertical force vector (90-degree angle)
• at conditions approx. 20°C

What influences lifting capacity in practice

It is worth knowing that the working load may be lower subject to elements below, in order of importance:

• Distance – existence of foreign body (paint, tape, air) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
• Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
• Base massiveness – insufficiently thick steel does not accept the full field, causing part of the flux to be wasted to the other side.
• Steel grade – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
• Base smoothness – the more even the plate, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
• Thermal conditions – 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).

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap {between} the magnet’s surface and the plate reduces the lifting capacity.