MT 50x1.5x100000 - magnetic tape

Strengths as well as weaknesses of NdFeB magnets.

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:

• They have constant strength, and over more than ten years their attraction force decreases symbolically – ~1% (in testing),
• Magnets effectively protect themselves against demagnetization caused by external fields,
• By covering with a decorative coating of gold, the element gains an professional look,
• They feature high magnetic induction at the operating surface, making them more effective,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Considering the possibility of precise molding and adaptation to custom solutions, magnetic components can be manufactured in a variety of geometric configurations, which makes them more universal,
• Fundamental importance in modern technologies – they serve a role in data components, electromotive mechanisms, medical equipment, and industrial machines.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

• To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend 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 immune to moisture, when using outdoors
• Due to limitations in creating threads and complex shapes in magnets, we propose using a housing - magnetic mount.
• Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Additionally, small components of these devices can be problematic in diagnostics medical after entering the body.
• Due to neodymium price, their price exceeds standard values,

Optimal lifting capacity of a neodymium magnet – what it depends on?

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

• with the use of a sheet made of low-carbon steel, guaranteeing maximum field concentration
• whose transverse dimension equals approx. 10 mm
• with a surface perfectly flat
• under conditions of gap-free contact (surface-to-surface)
• for force applied at a right angle (in the magnet axis)
• at ambient temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Holding efficiency is influenced by working environment parameters, such as (from priority):

• Gap (between the magnet and the plate), because even a very small distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, rust or debris).
• Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
• Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Material composition – different alloys reacts the same. High carbon content worsen the attraction effect.
• Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
• Thermal environment – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.

* Lifting capacity was measured by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a minimal clearance {between} the magnet’s surface and the plate decreases the load capacity.