RM R8 ULTRA - 13000 Gs / N52 - magnetic distributor

Strengths and weaknesses of NdFeB magnets.

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

• They have constant strength, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
• They are noted for resistance to demagnetization induced by external magnetic fields,
• Thanks to the elegant finish, the layer of nickel, gold, or silver-plated gives an modern appearance,
• The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of individual modeling as well as optimizing to concrete conditions,
• Key role in modern industrial fields – they are used in hard drives, motor assemblies, advanced medical instruments, as well as industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in compact constructions

Problematic aspects of neodymium magnets: application proposals

• Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• Limited possibility of creating threads in the magnet and complicated shapes - recommended is casing - mounting mechanism.
• Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, small elements of these products can complicate diagnosis medical when they are in the body.
• Due to neodymium price, their price is relatively high,

Maximum holding power of the magnet – what it depends on?

Holding force of 0 kg is a measurement result performed under standard conditions:

• using a base made of mild steel, functioning as a ideal flux conductor
• with a thickness of at least 10 mm
• characterized by smoothness
• without the slightest air gap between the magnet and steel
• for force applied at a right angle (pull-off, not shear)
• at conditions approx. 20°C

Determinants of lifting force in real conditions

Please note that the magnet holding may be lower depending on the following factors, in order of importance:

• Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
• Base massiveness – insufficiently thick steel causes magnetic saturation, causing part of the flux to be lost to the other side.
• Material composition – different alloys attracts identically. Alloy additives worsen the attraction effect.
• 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 results in weakening of force. Check the maximum operating temperature for a given model.

* Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance {between} the magnet’s surface and the plate decreases the holding force.