NCM 40x13.5x5 / N38 - channel magnetic holder

Pros as well as cons of neodymium magnets.

Besides their remarkable strength, neodymium magnets offer the following advantages:

• They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (according to literature),
• They show high resistance to demagnetization induced by external disturbances,
• The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to look better,
• Magnets are distinguished by maximum magnetic induction on the active area,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Considering the ability of precise molding and customization to unique requirements, magnetic components can be manufactured in a variety of shapes and sizes, which amplifies use scope,
• Huge importance in advanced technology sectors – they find application in hard drives, brushless drives, precision medical tools, as well as modern systems.
• Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

• At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
• 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 usually 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 producing nuts in the magnet and complicated forms - recommended is casing - mounting mechanism.
• Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these products are able to be problematic in diagnostics medical after entering the body.
• Due to neodymium price, their price exceeds standard values,

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

Magnet power is the result of a measurement for the most favorable conditions, including:

• with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
• with a cross-section of at least 10 mm
• with an ground touching surface
• under conditions of no distance (surface-to-surface)
• for force applied at a right angle (in the magnet axis)
• at room temperature

Practical lifting capacity: influencing factors

Please note that the application force will differ depending on the following factors, starting with the most relevant:

• Air gap (betwixt the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
• Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
• Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
• Material type – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
• Plate texture – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
• Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was measured with the use of a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under parallel forces the holding force is lower. Additionally, even a small distance {between} the magnet’s surface and the plate decreases the load capacity.