SM 32x375 [2xM8] / N42 - magnetic separator

Advantages and disadvantages of rare earth magnets.

Apart from their notable holding force, neodymium magnets have these key benefits:

• They retain magnetic properties for around 10 years – the loss is just ~1% (in theory),
• Magnets effectively resist against demagnetization caused by external fields,
• In other words, due to the shiny layer of silver, the element is aesthetically pleasing,
• They show high magnetic induction at the operating surface, which increases their power,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
• Possibility of custom creating as well as adjusting to precise needs,
• Wide application in advanced technology sectors – they serve a role in computer drives, electric drive systems, medical devices, as well as complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in small systems

Cons of neodymium magnets: tips and applications.

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• We recommend cover - magnetic holder, due to difficulties in creating threads inside the magnet and complicated shapes.
• Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
• With large orders the cost of neodymium magnets can be a barrier,

Maximum lifting force for a neodymium magnet – what it depends on?

Breakaway force is the result of a measurement for ideal contact conditions, including:

• on a plate made of mild steel, perfectly concentrating the magnetic field
• possessing a massiveness of at least 10 mm to ensure full flux closure
• characterized by even structure
• under conditions of no distance (metal-to-metal)
• under axial application of breakaway force (90-degree angle)
• at ambient temperature room level

Key elements affecting lifting force

It is worth knowing that the application force will differ depending on elements below, starting with the most relevant:

• Distance – the presence of foreign body (paint, tape, gap) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
• Direction of force – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
• Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Material composition – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
• Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal reduce efficiency.
• Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a small distance {between} the magnet and the plate decreases the load capacity.