RM R2 - 13000 Gs / N52 - magnetic distributor

Strengths and weaknesses of rare earth magnets.

Apart from their notable magnetic energy, neodymium magnets have these key benefits:

• They have stable power, and over around 10 years their attraction force decreases symbolically – ~1% (in testing),
• Neodymium magnets prove to be highly resistant to magnetic field loss caused by magnetic disturbances,
• A magnet with a shiny gold surface has better 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 precise machining as well as adapting to atypical conditions,
• Significant place in advanced technology sectors – they find application in data components, drive modules, diagnostic systems, as well as multitasking production systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets: application proposals

• At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's 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.
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
• We recommend a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complicated shapes.
• Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

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

Holding force of 0 kg is a result of laboratory testing executed under standard conditions:

• on a block made of structural steel, optimally conducting the magnetic field
• whose transverse dimension reaches at least 10 mm
• with an ideally smooth touching surface
• under conditions of ideal adhesion (surface-to-surface)
• during pulling in a direction perpendicular to the mounting surface
• at standard ambient temperature

What influences lifting capacity in practice

Real force is affected by specific conditions, including (from priority):

• Gap (betwixt the magnet and the plate), as even a microscopic clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
• Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
• Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
• Material composition – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
• Surface condition – smooth surfaces ensure maximum contact, which increases force. Uneven metal reduce efficiency.
• Heat – 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).

* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the holding force is lower. In addition, even a minimal clearance {between} the magnet and the plate reduces the holding force.