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

Pros as well as cons of rare earth magnets.

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

• Their power remains stable, and after around 10 years it decreases only by ~1% (according to research),
• Neodymium magnets are distinguished by remarkably resistant to magnetic field loss caused by external interference,
• A magnet with a smooth nickel surface has an effective appearance,
• Neodymium magnets ensure maximum magnetic induction on a small area, which allows for strong attraction,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Possibility of precise machining as well as adapting to concrete requirements,
• Wide application in modern industrial fields – they are utilized in magnetic memories, drive modules, precision medical tools, as well as complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in small systems

Disadvantages of NdFeB magnets:

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
• When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• We suggest a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complicated forms.
• Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. Additionally, small elements of these devices can be problematic in diagnostics medical after entering the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Magnetic strength at its maximum – what contributes to it?

Holding force of 0 kg is a result of laboratory testing performed under the following configuration:

• with the use of a yoke made of special test steel, guaranteeing full magnetic saturation
• with a cross-section minimum 10 mm
• characterized by even structure
• without any insulating layer between the magnet and steel
• during detachment in a direction vertical to the mounting surface
• at temperature room level

Magnet lifting force in use – key factors

Holding efficiency is influenced by specific conditions, including (from priority):

• Gap (between the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) can cause a decrease in force by up to 50% (this also applies to varnish, corrosion or debris).
• Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
• Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
• Metal type – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
• Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
• Temperature – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.

* Lifting capacity was determined by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the holding force is lower. Additionally, even a slight gap {between} the magnet’s surface and the plate lowers the lifting capacity.