MW 6x2 / N38 - cylindrical magnet

Pros as well as cons of neodymium magnets.

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

• They have constant strength, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
• They retain their magnetic properties even under close interference source,
• By using a reflective layer of silver, the element gains an aesthetic look,
• Magnets exhibit maximum magnetic induction on the outer layer,
• Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
• Possibility of exact creating as well as adjusting to individual requirements,
• Fundamental importance in electronics industry – they find application in hard drives, electromotive mechanisms, medical devices, and complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in compact constructions

Problematic aspects of neodymium magnets: tips and applications.

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
• Neodymium magnets decrease their force 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
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
• Due to limitations in creating threads and complex forms in magnets, we propose using a housing - magnetic mount.
• Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Furthermore, small components of these products are able to complicate diagnosis medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum lifting force for a neodymium magnet – what it depends on?

The specified lifting capacity represents the maximum value, obtained under optimal environment, specifically:

• on a plate made of mild steel, perfectly concentrating the magnetic field
• whose transverse dimension equals approx. 10 mm
• with an ideally smooth touching surface
• with direct contact (without impurities)
• during detachment in a direction perpendicular to the plane
• at temperature room level

Impact of factors on magnetic holding capacity in practice

Please note that the magnet holding may be lower influenced by elements below, starting with the most relevant:

• Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Angle of force application – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
• Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
• Metal type – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
• Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
• Temperature – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

* Lifting capacity was measured by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.