SM 32x350 [2xM8] / N42 - magnetic separator

Pros and cons of neodymium magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

• They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
• They possess excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
• In other words, due to the glossy layer of silver, the element becomes visually attractive,
• Magnetic induction on the surface of the magnet is exceptional,
• Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of accurate shaping as well as adjusting to precise applications,
• Huge importance in high-tech industry – they find application in data components, electromotive mechanisms, precision medical tools, and other advanced devices.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets and ways of using them

• At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Due to limitations in producing threads and complex shapes in magnets, we recommend using casing - magnetic mount.
• Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical when they are in the body.
• With budget limitations the cost of neodymium magnets is economically unviable,

Maximum magnetic pulling force – what it depends on?

The specified lifting capacity concerns the peak performance, recorded under optimal environment, specifically:

• on a base made of mild steel, optimally conducting the magnetic flux
• with a cross-section minimum 10 mm
• characterized by even structure
• under conditions of ideal adhesion (metal-to-metal)
• under vertical application of breakaway force (90-degree angle)
• at conditions approx. 20°C

Lifting capacity in practice – influencing factors

It is worth knowing that the working load will differ depending on the following factors, in order of importance:

• Gap (between the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
• Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
• Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
• Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
• Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
• Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the holding force is lower. Moreover, even a slight gap {between} the magnet’s surface and the plate decreases the load capacity.