RM R8 ULTRA - 13000 Gs / N52 - magnetic distributor

Advantages and disadvantages of neodymium magnets.

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

• They retain magnetic properties for almost ten years – the drop is just ~1% (in theory),
• They retain their magnetic properties even under external field action,
• In other words, due to the aesthetic layer of silver, the element is aesthetically pleasing,
• Magnets are characterized by excellent magnetic induction on the working surface,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Thanks to freedom in designing and the ability to adapt to complex applications,
• Fundamental importance in modern industrial fields – they are commonly used in data components, motor assemblies, diagnostic systems, as well as complex engineering applications.
• Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages of neodymium magnets:

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
• Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in realizing nuts and complicated shapes in magnets, we recommend using a housing - magnetic mechanism.
• Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these magnets are able to complicate diagnosis medical after entering the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum magnetic pulling force – what affects it?

Information about lifting capacity was determined for ideal contact conditions, assuming:

• on a block made of mild steel, effectively closing the magnetic field
• whose transverse dimension equals approx. 10 mm
• characterized by lack of roughness
• with zero gap (no coatings)
• under vertical force direction (90-degree angle)
• at conditions approx. 20°C

Lifting capacity in practice – influencing factors

Please note that the working load will differ subject to elements below, in order of importance:

• Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Steel thickness – too thin steel does not accept the full field, causing part of the power to be lost into the air.
• Steel grade – ideal substrate is high-permeability steel. Cast iron may attract less.
• Surface condition – smooth surfaces ensure maximum contact, which increases force. Rough surfaces weaken the grip.
• Thermal environment – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

* Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the holding force is lower. In addition, even a minimal clearance {between} the magnet’s surface and the plate lowers the holding force.