MW 8x1.5 / N38 - cylindrical magnet

Advantages and disadvantages of rare earth magnets.

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

• They do not lose magnetism, even over approximately 10 years – the drop in lifting capacity is only ~1% (according to tests),
• They are noted for resistance to demagnetization induced by external magnetic fields,
• In other words, due to the metallic surface of nickel, the element is aesthetically pleasing,
• Neodymium magnets achieve maximum magnetic induction on a their surface, which increases force concentration,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Due to the ability of flexible shaping and adaptation to custom projects, neodymium magnets can be produced in a wide range of shapes and sizes, which expands the range of possible applications,
• Versatile presence in modern technologies – they find application in computer drives, drive modules, medical devices, also modern systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in compact constructions

Disadvantages of NdFeB magnets:

• To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
• Due to limitations in realizing nuts and complex forms in magnets, we propose using cover - magnetic mount.
• Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products are able to complicate diagnosis medical after entering the body.
• Due to expensive raw materials, their price is higher than average,

Maximum holding power of the magnet – what contributes to it?

Magnet power was determined for ideal contact conditions, taking into account:

• on a base made of structural steel, optimally conducting the magnetic field
• possessing a thickness of at least 10 mm to avoid saturation
• with a surface cleaned and smooth
• with direct contact (without impurities)
• during detachment in a direction vertical to the plane
• at standard ambient temperature

Lifting capacity in practice – influencing factors

Real force is affected by working environment parameters, mainly (from most important):

• Distance – the presence of any layer (paint, tape, gap) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
• Load vector – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
• Plate thickness – too thin plate does not close the flux, causing part of the power to be lost into the air.
• Material composition – not every steel reacts the same. High carbon content worsen the attraction effect.
• Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal weaken the grip.
• Thermal factor – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, however under shearing force the holding force is lower. In addition, even a small distance {between} the magnet’s surface and the plate decreases the lifting capacity.