UMP 75x25 [M10x3] GW F200 GOLD Lina / N42 - search holder

Pros and cons of neodymium magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

• They do not lose magnetism, even over nearly ten years – the drop in lifting capacity is only ~1% (based on measurements),
• They possess excellent resistance to magnetic field loss as a result of external magnetic sources,
• A magnet with a metallic nickel surface has an effective appearance,
• The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
• Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
• Possibility of precise shaping as well as adapting to concrete requirements,
• Huge importance in modern technologies – they are used in data components, motor assemblies, precision medical tools, also modern systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in compact constructions

Disadvantages of NdFeB magnets:

• To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Limited ability of creating threads in the magnet and complicated forms - recommended is a housing - magnet mounting.
• Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Furthermore, small components of these magnets are able to be problematic in diagnostics medical after entering the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

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

Magnet power was determined for optimal configuration, taking into account:

• using a base made of high-permeability steel, functioning as a ideal flux conductor
• whose transverse dimension reaches at least 10 mm
• with a surface perfectly flat
• with zero gap (without paint)
• under vertical force direction (90-degree angle)
• at standard ambient temperature

Lifting capacity in real conditions – factors

In real-world applications, the actual holding force is determined by several key aspects, ranked from the most important:

• Distance (betwixt the magnet and the metal), since even a very small distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, rust or dirt).
• Load vector – maximum parameter is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
• Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
• Material type – the best choice is pure iron steel. Cast iron may attract less.
• Base smoothness – the more even the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
• Temperature – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

* 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. Moreover, even a minimal clearance {between} the magnet and the plate lowers the lifting capacity.