MW 8x15 / N38 - cylindrical magnet

Advantages and disadvantages of neodymium magnets.

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

• They retain magnetic properties for nearly ten years – the drop is just ~1% (based on simulations),
• They feature excellent resistance to magnetic field loss as a result of external fields,
• By covering with a decorative coating of nickel, the element presents an elegant look,
• The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures approaching 230°C and above...
• In view of the option of flexible shaping and customization to individualized needs, NdFeB magnets can be created in a wide range of forms and dimensions, which makes them more universal,
• Universal use in modern industrial fields – they are utilized in data components, drive modules, precision medical tools, and technologically advanced constructions.
• Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages of neodymium magnets:

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest 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 suggest a housing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex forms.
• Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these products can be problematic in diagnostics medical after entering the body.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum holding power of the magnet – what affects it?

The specified lifting capacity refers to the limit force, recorded under laboratory conditions, namely:

• on a plate made of structural steel, optimally conducting the magnetic field
• with a cross-section minimum 10 mm
• characterized by lack of roughness
• under conditions of ideal adhesion (metal-to-metal)
• during pulling in a direction vertical to the plane
• at standard ambient temperature

Practical lifting capacity: influencing factors

Please note that the application force may be lower influenced by the following factors, starting with the most relevant:

• Distance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
• Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
• Material composition – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
• Surface condition – ground elements ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
• Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet’s surface and the plate decreases the holding force.