UMGB 75x28 [M10x3] GW F200 GOLD +Lina GOBLIN / N42 - goblin magnetic holder

Advantages as well as disadvantages of NdFeB magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• They retain magnetic properties for almost ten years – the loss is just ~1% (according to analyses),
• Neodymium magnets prove to be extremely resistant to loss of magnetic properties caused by magnetic disturbances,
• Thanks to the shimmering finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an elegant appearance,
• Magnets possess huge magnetic induction on the outer layer,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Possibility of accurate modeling and modifying to concrete requirements,
• Wide application in innovative solutions – they are commonly used in computer drives, electromotive mechanisms, medical equipment, as well as industrial machines.
• Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

• To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
• When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• We suggest a housing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated forms.
• Health risk to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. It is also worth noting that tiny parts of these magnets can disrupt the diagnostic process medical when they are in the body.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Detachment force of the magnet in optimal conditions – what it depends on?

The load parameter shown concerns the maximum value, obtained under optimal environment, namely:

• on a base made of structural steel, optimally conducting the magnetic flux
• possessing a massiveness of min. 10 mm to avoid saturation
• with a surface free of scratches
• with direct contact (no impurities)
• under vertical force direction (90-degree angle)
• in temp. approx. 20°C

Practical aspects of lifting capacity – factors

Real force is influenced by specific conditions, including (from most important):

• Gap (betwixt the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
• Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
• Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Chemical composition of the base – mild steel gives the best results. Alloy admixtures reduce magnetic properties and lifting capacity.
• Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
• Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

* Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance {between} the magnet’s surface and the plate decreases the holding force.