SM 32x100 [2xM8] / N52 - magnetic separator

Strengths as well as weaknesses of rare earth magnets.

Besides their remarkable pulling force, neodymium magnets offer the following advantages:

• They virtually do not lose strength, because even after ten years the performance loss is only ~1% (based on calculations),
• They possess excellent resistance to magnetic field loss when exposed to opposing magnetic fields,
• In other words, due to the smooth finish of gold, the element is aesthetically pleasing,
• They show high magnetic induction at the operating surface, making them more effective,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Thanks to flexibility in shaping and the capacity to modify to unusual requirements,
• Significant place in modern technologies – they serve a role in computer drives, electric drive systems, advanced medical instruments, also complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in small systems

Cons of neodymium magnets and ways of using them

• At very strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
• NdFeB magnets lose strength 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 very resistant to heat
• Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in creating threads and complicated forms in magnets, we recommend using casing - magnetic mount.
• Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to disrupt the diagnostic process medical after entering the body.
• Due to complex production process, their price is higher than average,

Optimal lifting capacity of a neodymium magnet – what affects it?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:

• on a base made of structural steel, perfectly concentrating the magnetic flux
• possessing a thickness of minimum 10 mm to ensure full flux closure
• with a surface perfectly flat
• without the slightest air gap between the magnet and steel
• for force applied at a right angle (in the magnet axis)
• at temperature room level

Determinants of practical lifting force of a magnet

In real-world applications, the actual holding force depends on a number of factors, ranked from the most important:

• Distance (between the magnet and the metal), as even a tiny distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
• Direction of force – highest force is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
• 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.
• Steel grade – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
• Smoothness – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
• Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was determined with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under parallel forces the holding force is lower. In addition, even a minimal clearance {between} the magnet’s surface and the plate reduces the load capacity.