MW 6x6 / N38 - cylindrical magnet

Strengths as well as weaknesses of neodymium magnets.

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

• They do not lose magnetism, even after nearly 10 years – the decrease in power is only ~1% (theoretically),
• They possess excellent resistance to weakening of magnetic properties when exposed to external magnetic sources,
• By using a reflective coating of nickel, the element presents an professional look,
• The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
• Possibility of accurate creating as well as adjusting to individual needs,
• Key role in high-tech industry – they are used in mass storage devices, electric motors, advanced medical instruments, as well as technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in compact constructions

Disadvantages of neodymium magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their durability
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
• Limited possibility of creating threads in the magnet and complex shapes - recommended is casing - magnetic holder.
• Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
• Due to neodymium price, their price is relatively high,

Maximum lifting capacity of the magnet – what contributes to it?

The force parameter is a result of laboratory testing conducted under the following configuration:

• using a base made of high-permeability steel, functioning as a magnetic yoke
• whose thickness is min. 10 mm
• characterized by even structure
• without the slightest insulating layer between the magnet and steel
• during detachment in a direction perpendicular to the mounting surface
• at room temperature

Determinants of lifting force in real conditions

In real-world applications, the real power is determined by a number of factors, presented from crucial:

• Distance – existence of any layer (rust, dirt, air) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
• Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
• Steel grade – the best choice is pure iron steel. Stainless steels may generate lower lifting capacity.
• Base smoothness – the more even the plate, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
• Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance {between} the magnet and the plate reduces the load capacity.