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

Pros as well as cons of neodymium magnets.

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

• They do not lose power, even over around 10 years – the drop in power is only ~1% (based on measurements),
• Magnets perfectly defend themselves against loss of magnetization caused by external fields,
• The use of an refined coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
• They feature high magnetic induction at the operating surface, making them more effective,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures approaching 230°C and above...
• Possibility of individual creating and optimizing to precise conditions,
• Key role in future technologies – they serve a role in mass storage devices, drive modules, advanced medical instruments, as well as technologically advanced constructions.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• Limited possibility of producing threads in the magnet and complicated forms - preferred is cover - magnet mounting.
• Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these devices can be problematic in diagnostics medical when they are in the body.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Maximum lifting capacity of the magnet – what affects it?

The declared magnet strength refers to the peak performance, obtained under laboratory conditions, specifically:

• using a base made of high-permeability steel, serving as a circuit closing element
• possessing a massiveness of min. 10 mm to ensure full flux closure
• characterized by smoothness
• under conditions of gap-free contact (surface-to-surface)
• under vertical force vector (90-degree angle)
• at room temperature

Lifting capacity in real conditions – factors

Effective lifting capacity is influenced by working environment parameters, such as (from most important):

• Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
• Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds much less (typically approx. 20-30% of maximum force).
• Plate thickness – insufficiently thick plate does not close the flux, causing part of the flux to be escaped into the air.
• Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
• Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
• Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under shearing force the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet and the plate reduces the holding force.