SMZR 25x250 / N52 - magnetic separator with handle

Pros as well as cons of NdFeB magnets.

Besides their stability, neodymium magnets are valued for these benefits:

• Their magnetic field remains stable, and after around 10 years it decreases only by ~1% (according to research),
• Magnets perfectly protect themselves against demagnetization caused by foreign field sources,
• In other words, due to the glossy layer of silver, the element gains a professional look,
• Magnets exhibit extremely high magnetic induction on the outer layer,
• Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
• Thanks to the ability of precise molding and customization to individualized solutions, neodymium magnets can be produced in a wide range of forms and dimensions, which makes them more universal,
• Wide application in electronics industry – they are utilized in magnetic memories, motor assemblies, diagnostic systems, as well as complex engineering applications.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of neodymium magnets:

• Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, 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.
• Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Limited ability of producing nuts in the magnet and complex forms - recommended is a housing - mounting mechanism.
• Health risk resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices can complicate diagnosis medical after entering the body.
• With budget limitations the cost of neodymium magnets is a challenge,

Optimal lifting capacity of a neodymium magnet – what contributes to it?

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

• with the contact of a sheet made of special test steel, ensuring full magnetic saturation
• possessing a massiveness of at least 10 mm to ensure full flux closure
• with a surface cleaned and smooth
• with total lack of distance (without coatings)
• under vertical force direction (90-degree angle)
• at temperature room level

Practical aspects of lifting capacity – factors

Please note that the magnet holding may be lower influenced by elements below, starting with the most relevant:

• Air gap (between the magnet and the metal), since even a microscopic distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
• Direction of force – maximum parameter is reached only during perpendicular pulling. The resistance to sliding of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
• Steel thickness – too thin plate causes magnetic saturation, causing part of the flux to be escaped into the air.
• Steel type – low-carbon steel attracts best. Alloy admixtures lower magnetic properties and lifting capacity.
• Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
• Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the holding force is lower. In addition, even a minimal clearance {between} the magnet and the plate reduces the holding force.