MW 10x10 / N38 - cylindrical magnet

Pros and cons of neodymium magnets.

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

• They have unchanged lifting capacity, and over around ten years their attraction force decreases symbolically – ~1% (according to theory),
• They possess excellent resistance to magnetic field loss due to external fields,
• A magnet with a shiny silver surface has better aesthetics,
• Magnetic induction on the working part of the magnet remains exceptional,
• Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of accurate shaping as well as adjusting to concrete applications,
• Fundamental importance in advanced technology sectors – they serve a role in data components, brushless drives, medical equipment, as well as industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in miniature devices

Disadvantages of NdFeB magnets:

• To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Due to limitations in producing threads and complicated shapes in magnets, we recommend using casing - magnetic mechanism.
• Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small elements of these magnets can disrupt the diagnostic process medical after entering the body.
• With large orders the cost of neodymium magnets can be a barrier,

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

Breakaway force was defined for ideal contact conditions, taking into account:

• with the application of a sheet made of low-carbon steel, ensuring full magnetic saturation
• possessing a thickness of minimum 10 mm to avoid saturation
• characterized by even structure
• with total lack of distance (without paint)
• under vertical application of breakaway force (90-degree angle)
• in temp. approx. 20°C

Practical aspects of lifting capacity – factors

In real-world applications, the actual lifting capacity depends on several key aspects, listed from the most important:

• Space between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
• Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
• Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
• Steel grade – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
• Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
• Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the load capacity is reduced by as much as 5 times. In addition, even a slight gap {between} the magnet and the plate lowers the holding force.