SM 32x200 [2xM8] / N52 - magnetic separator

Advantages as well as disadvantages of neodymium magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
• They do not lose their magnetic properties even under close interference source,
• By using a lustrous layer of silver, the element acquires an professional look,
• Neodymium magnets create maximum magnetic induction on a small area, which increases force concentration,
• Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to the possibility of accurate forming and adaptation to specialized projects, magnetic components can be created in a variety of forms and dimensions, which increases their versatility,
• Universal use in future technologies – they are commonly used in data components, brushless drives, diagnostic systems, and industrial machines.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of neodymium magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
• When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
• Limited ability of creating nuts in the magnet and complex forms - preferred is casing - magnet mounting.
• Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small elements of these magnets can complicate diagnosis medical in case of swallowing.
• Due to expensive raw materials, their price is higher than average,

Maximum magnetic pulling force – what contributes to it?

The declared magnet strength represents the peak performance, recorded under laboratory conditions, specifically:

• with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
• possessing a massiveness of min. 10 mm to avoid saturation
• characterized by smoothness
• with total lack of distance (no paint)
• during detachment in a direction perpendicular to the mounting surface
• at ambient temperature room level

What influences lifting capacity in practice

Effective lifting capacity is affected by working environment parameters, such as (from priority):

• Gap (betwixt the magnet and the metal), because even a very small distance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
• Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
• Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
• Steel grade – ideal substrate is pure iron steel. Hardened steels may generate lower lifting capacity.
• Surface finish – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity was measured by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet’s surface and the plate lowers the holding force.