MW 6x6 / N38 - cylindrical magnet

Strengths as well as weaknesses of NdFeB magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They retain full power for nearly 10 years – the loss is just ~1% (in theory),
• They retain their magnetic properties even under external field action,
• By using a decorative layer of gold, the element gains an nice look,
• They feature high magnetic induction at the operating surface, which affects their effectiveness,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
• In view of the potential of precise forming and adaptation to specialized projects, neodymium magnets can be created in a broad palette of geometric configurations, which amplifies use scope,
• Fundamental importance in innovative solutions – they are used in data components, brushless drives, precision medical tools, as well as technologically advanced constructions.
• Thanks to concentrated force, small magnets offer high operating force, with minimal size,

What to avoid - cons of neodymium magnets: tips and applications.

• Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest 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 secure oxidation as well as corrosion.
• We suggest casing - magnetic holder, due to difficulties in realizing threads inside the magnet and complicated forms.
• Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small elements of these magnets can complicate diagnosis medical in case of swallowing.
• With mass production the cost of neodymium magnets is economically unviable,

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

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

• with the use of a sheet made of special test steel, ensuring maximum field concentration
• with a cross-section minimum 10 mm
• characterized by smoothness
• without any air gap between the magnet and steel
• for force acting at a right angle (in the magnet axis)
• at temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

Real force is influenced by specific conditions, including (from most important):

• Distance (betwixt the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
• Direction of force – highest force is reached only during perpendicular pulling. The shear force of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
• Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Material composition – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
• Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
• Temperature – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the holding force is lower. In addition, even a small distance {between} the magnet’s surface and the plate lowers the load capacity.