RM R2 - 13000 Gs / N52 - magnetic distributor

Strengths and weaknesses of NdFeB magnets.

Besides their durability, neodymium magnets are valued for these benefits:

• They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
• They are resistant to demagnetization induced by external magnetic fields,
• A magnet with a metallic gold surface is more attractive,
• Magnetic induction on the working part of the magnet turns out to be strong,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Thanks to versatility in shaping and the capacity to adapt to client solutions,
• Significant place in high-tech industry – they find application in magnetic memories, drive modules, precision medical tools, and modern systems.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
• When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• We suggest a housing - magnetic mechanism, due to difficulties in producing threads 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 devices are able to disrupt the diagnostic process medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Breakaway strength of the magnet in ideal conditions – what it depends on?

Breakaway force is the result of a measurement for the most favorable conditions, taking into account:

• using a plate made of high-permeability steel, acting as a magnetic yoke
• whose thickness equals approx. 10 mm
• with an ideally smooth contact surface
• under conditions of gap-free contact (metal-to-metal)
• for force applied at a right angle (pull-off, not shear)
• at temperature room level

Key elements affecting lifting force

In practice, the actual holding force results from a number of factors, presented from most significant:

• Air gap (between the magnet and the plate), as even a tiny distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, corrosion or debris).
• Load vector – highest force is reached only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
• Steel thickness – insufficiently thick steel does not close the flux, causing part of the power to be escaped to the other side.
• Steel grade – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
• Surface finish – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
• Thermal environment – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. Additionally, even a small distance {between} the magnet and the plate decreases the lifting capacity.