UMP 75x24 [M8+M10] GW F 200 kg - search holder

Pros as well as cons of NdFeB magnets.

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

• They retain full power for around 10 years – the drop is just ~1% (based on simulations),
• They have excellent resistance to weakening of magnetic properties due to external fields,
• A magnet with a shiny silver surface looks better,
• They are known for 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 form) even at high temperatures reaching 230°C or more...
• Thanks to flexibility in forming and the ability to adapt to unusual requirements,
• Significant place in future technologies – they are commonly used in magnetic memories, motor assemblies, medical equipment, as well as multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in miniature devices

Disadvantages of NdFeB magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
• Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in producing threads and complex shapes in magnets, we propose using casing - magnetic mount.
• Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these devices can disrupt the diagnostic process medical after entering the body.
• With mass production the cost of neodymium magnets can be a barrier,

Maximum holding power of the magnet – what affects it?

The specified lifting capacity concerns the maximum value, measured under optimal environment, meaning:

• using a base made of low-carbon steel, serving as a circuit closing element
• with a cross-section no less than 10 mm
• characterized by lack of roughness
• with total lack of distance (no coatings)
• under perpendicular application of breakaway force (90-degree angle)
• in temp. approx. 20°C

Lifting capacity in real conditions – factors

Effective lifting capacity is influenced by specific conditions, such as (from priority):

• Air gap (between the magnet and the metal), because even a very small distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
• Direction of force – highest force is available only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
• Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
• Material type – the best choice is pure iron steel. Hardened steels may attract less.
• Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
• Temperature influence – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was assessed by applying a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under parallel forces the holding force is lower. Additionally, even a slight gap {between} the magnet’s surface and the plate lowers the holding force.