MW 6x2 / N38 - cylindrical magnet

Strengths and weaknesses of NdFeB magnets.

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

• They retain magnetic properties for nearly ten years – the loss is just ~1% (according to analyses),
• Neodymium magnets are remarkably resistant to loss of magnetic properties caused by external interference,
• By using a shiny layer of gold, the element presents an elegant look,
• Magnetic induction on the top side 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...
• Thanks to versatility in constructing and the capacity to modify to client solutions,
• Universal use in modern technologies – they are commonly used in HDD drives, electric drive systems, medical devices, and multitasking production systems.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets: application proposals

• To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
• Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Due to limitations in producing threads and complicated forms in magnets, we recommend using a housing - magnetic mount.
• Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical when they are in the body.
• With large orders the cost of neodymium magnets is a challenge,

Detachment force of the magnet in optimal conditions – what affects it?

The lifting capacity listed is a measurement result conducted under specific, ideal conditions:

• using a plate made of low-carbon steel, acting as a circuit closing element
• with a thickness of at least 10 mm
• with a plane perfectly flat
• without any clearance between the magnet and steel
• for force applied at a right angle (pull-off, not shear)
• at temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

It is worth knowing that the working load will differ subject to elements below, in order of importance:

• Gap (betwixt the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
• Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of nominal force).
• Steel thickness – insufficiently thick steel causes magnetic saturation, causing part of the power to be wasted to the other side.
• Material type – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
• Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
• Thermal factor – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

* Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the load capacity is reduced by as much as 75%. In addition, even a small distance {between} the magnet’s surface and the plate decreases the lifting capacity.