RM R8 ULTRA - 13000 Gs / N52 - magnetic distributor

Pros as well as cons of neodymium magnets.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

• They virtually do not lose power, because even after ten years the performance loss is only ~1% (according to literature),
• Magnets very well protect themselves against demagnetization caused by ambient magnetic noise,
• A magnet with a metallic gold surface has an effective appearance,
• Neodymium magnets achieve maximum magnetic induction on a small area, which increases force concentration,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
• Thanks to freedom in designing and the capacity to adapt to client solutions,
• Universal use in modern technologies – they serve a role in data components, electric drive systems, medical devices, and technologically advanced constructions.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons of neodymium magnets and proposals for their use:

• To avoid cracks under impact, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
• NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and 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
• When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
• We recommend cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex forms.
• Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these devices are able to be problematic in diagnostics medical when they are in the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum lifting capacity of the magnet – what it depends on?

The lifting capacity listed is a theoretical maximum value conducted under the following configuration:

• with the use of a yoke made of special test steel, guaranteeing maximum field concentration
• with a thickness no less than 10 mm
• characterized by even structure
• with total lack of distance (without impurities)
• for force acting at a right angle (in the magnet axis)
• at conditions approx. 20°C

Practical lifting capacity: influencing factors

In real-world applications, the actual lifting capacity results from several key aspects, listed from the most important:

• Gap (between the magnet and the plate), as even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, corrosion or dirt).
• Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
• Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
• Metal type – different alloys attracts identically. Alloy additives weaken the interaction with the magnet.
• Plate texture – ground elements guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
• Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as 75%. Moreover, even a small distance {between} the magnet’s surface and the plate lowers the lifting capacity.