RM R8 ULTRA - 13000 Gs / N52 - magnetic distributor

Strengths as well as weaknesses of neodymium magnets.

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

• Their magnetic field remains stable, and after around 10 years it decreases only by ~1% (theoretically),
• They have excellent resistance to magnetic field loss when exposed to external fields,
• By applying a smooth coating of nickel, the element has an elegant look,
• Magnetic induction on the top side of the magnet is very high,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
• Thanks to flexibility in forming and the ability to adapt to specific needs,
• Versatile presence in high-tech industry – they serve a role in mass storage devices, drive modules, diagnostic systems, and industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in small systems

Problematic aspects of neodymium magnets and ways of using them

• At very strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
• We recommend casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated forms.
• Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these products are able to be problematic in diagnostics medical after entering the body.
• With mass production the cost of neodymium magnets can be a barrier,

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

The force parameter is a theoretical maximum value conducted under the following configuration:

• with the application of a yoke made of low-carbon steel, guaranteeing maximum field concentration
• whose transverse dimension is min. 10 mm
• with an polished touching surface
• without the slightest air gap between the magnet and steel
• for force acting at a right angle (in the magnet axis)
• at conditions approx. 20°C

Practical lifting capacity: influencing factors

Real force is influenced by specific conditions, such as (from most important):

• Distance (betwixt the magnet and the plate), because even a very small clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
• Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
• Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
• Steel type – low-carbon steel gives the best results. Higher carbon content reduce magnetic permeability and holding force.
• Surface finish – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under shearing force the load capacity is reduced by as much as 75%. In addition, even a small distance {between} the magnet’s surface and the plate decreases the load capacity.