SM 32x375 [2xM8] / N52 - magnetic separator

Strengths as well as weaknesses of NdFeB magnets.

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

• They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
• They show high resistance to demagnetization induced by external magnetic fields,
• By applying a smooth layer of nickel, the element gains an modern look,
• They feature high magnetic induction at the operating surface, which increases their power,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
• Considering the option of accurate forming and adaptation to unique projects, neodymium magnets can be modeled in a broad palette of forms and dimensions, which makes them more universal,
• Universal use in future technologies – they find application in magnetic memories, drive modules, medical devices, also modern systems.
• Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

What to avoid - cons of neodymium magnets: tips and applications.

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
• Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• We suggest cover - magnetic mount, due to difficulties in producing nuts inside the magnet and complex forms.
• Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can be problematic in diagnostics medical in case of swallowing.
• Due to neodymium price, their price is higher than average,

Maximum magnetic pulling force – what it depends on?

Information about lifting capacity is the result of a measurement for ideal contact conditions, taking into account:

• with the contact of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
• with a cross-section no less than 10 mm
• with an polished contact surface
• with zero gap (no coatings)
• under perpendicular force direction (90-degree angle)
• at room temperature

Magnet lifting force in use – key factors

Please note that the working load may be lower subject to elements below, in order of importance:

• Clearance – existence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Plate material – mild steel gives the best results. Alloy admixtures decrease magnetic properties and lifting capacity.
• Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
• Temperature – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the holding force is lower. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.