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

Advantages and disadvantages of rare earth magnets.

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

• They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
• They feature excellent resistance to magnetic field loss when exposed to external magnetic sources,
• A magnet with a metallic gold surface looks better,
• Neodymium magnets create maximum magnetic induction on a small surface, which allows for strong attraction,
• Neodymium magnets are known for exceptionally strong magnetic induction and the ability to work at temperatures up to 230°C or higher (depending on the shape),
• Considering the possibility of accurate forming and customization to custom projects, magnetic components can be produced in a variety of shapes and sizes, which expands the range of possible applications,
• Universal use in advanced technology sectors – they are utilized in magnetic memories, electric motors, medical equipment, also multitasking production systems.
• Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

What to avoid - cons of neodymium magnets and proposals for their use:

• To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
• Neodymium magnets lose power 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
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
• Due to limitations in realizing threads and complex forms in magnets, we recommend using cover - magnetic mount.
• Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, tiny parts 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 increases costs of application in large quantities

Magnetic strength at its maximum – what contributes to it?

Magnet power was defined for the most favorable conditions, taking into account:

• using a base made of low-carbon steel, acting as a magnetic yoke
• whose thickness reaches at least 10 mm
• characterized by even structure
• without the slightest clearance between the magnet and steel
• under axial force vector (90-degree angle)
• in stable room temperature

What influences lifting capacity in practice

Bear in mind that the working load may be lower influenced by elements below, starting with the most relevant:

• Distance – existence of any layer (paint, dirt, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
• Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content reduce magnetic permeability and lifting capacity.
• Base smoothness – the more even the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
• Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and in frost gain strength (up to a certain limit).

* Lifting capacity was assessed with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the holding force is lower. Moreover, even a minimal clearance {between} the magnet and the plate reduces the lifting capacity.