NCM 30x13.5x5 / N38 - channel magnetic holder

Advantages and disadvantages of neodymium magnets.

Apart from their consistent holding force, neodymium magnets have these key benefits:

• Their magnetic field remains stable, and after approximately ten years it decreases only by ~1% (according to research),
• They feature excellent resistance to magnetism drop when exposed to external fields,
• The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to present itself better,
• The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Thanks to flexibility in shaping and the capacity to modify to complex applications,
• Key role in advanced technology sectors – they are commonly used in data components, electric motors, precision medical tools, as well as technologically advanced constructions.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages of NdFeB magnets:

• At strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• We warn that neodymium magnets can lose 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 start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
• Limited possibility of making nuts in the magnet and complicated forms - recommended is cover - magnet mounting.
• Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Additionally, small elements of these devices can disrupt the diagnostic process medical after entering the body.
• Due to expensive raw materials, their price is higher than average,

Optimal lifting capacity of a neodymium magnet – what contributes to it?

The load parameter shown refers to the limit force, obtained under ideal test conditions, specifically:

• with the application of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
• whose transverse dimension is min. 10 mm
• with a surface perfectly flat
• with direct contact (without paint)
• for force applied at a right angle (in the magnet axis)
• at temperature room level

Impact of factors on magnetic holding capacity in practice

Holding efficiency is affected by specific conditions, such as (from priority):

• Clearance – the presence of any layer (paint, dirt, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Load vector – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
• Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
• Metal type – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
• Surface quality – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
• Thermal environment – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

* Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance {between} the magnet’s surface and the plate lowers the lifting capacity.