MPL 20x20x20 / N38 - lamellar magnet

Pros as well as cons of NdFeB magnets.

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

• They retain attractive force for around 10 years – the drop is just ~1% (based on simulations),
• Neodymium magnets are extremely resistant to loss of magnetic properties caused by external magnetic fields,
• Thanks to the elegant finish, the surface of nickel, gold-plated, or silver-plated gives an professional appearance,
• Magnetic induction on the top side of the magnet turns out to be extremely intense,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• Thanks to the possibility of precise shaping and adaptation to unique solutions, magnetic components can be manufactured in a broad palette of forms and dimensions, which amplifies use scope,
• Versatile presence in future technologies – they serve a role in data components, drive modules, advanced medical instruments, as well as modern systems.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages of neodymium magnets:

• They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
• Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
• They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Limited possibility of creating threads in the magnet and complicated shapes - recommended is a housing - magnetic holder.
• Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these devices can be problematic in diagnostics medical when they are in the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

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

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

• using a base made of high-permeability steel, serving as a magnetic yoke
• with a thickness of at least 10 mm
• characterized by even structure
• under conditions of no distance (surface-to-surface)
• under vertical force direction (90-degree angle)
• at standard ambient temperature

Lifting capacity in real conditions – factors

In real-world applications, the actual lifting capacity is determined by several key aspects, listed from most significant:

• Distance – existence of any layer (paint, tape, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
• Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
• Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Steel grade – ideal substrate is high-permeability steel. Cast iron may attract less.
• Smoothness – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
• Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance {between} the magnet’s surface and the plate reduces the lifting capacity.