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Advantages and disadvantages of neodymium magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
• Magnets very well resist against demagnetization caused by foreign field sources,
• A magnet with a metallic nickel surface is more attractive,
• The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• In view of the ability of accurate shaping and adaptation to unique solutions, magnetic components can be produced in a broad palette of shapes and sizes, which expands the range of possible applications,
• Wide application in future technologies – they are used in data components, electromotive mechanisms, advanced medical instruments, as well as complex engineering applications.
• Thanks to their power density, small magnets offer high operating force, in miniature format,

Cons of neodymium magnets: tips and applications.

• To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
• Neodymium magnets lose 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
• Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in producing threads and complex forms in magnets, we recommend using a housing - magnetic holder.
• Health risk resulting from small fragments of magnets are risky, if swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these products can disrupt the diagnostic process medical in case of swallowing.
• Due to neodymium price, their price is higher than average,

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

The force parameter is a measurement result conducted under the following configuration:

• using a plate made of mild steel, functioning as a ideal flux conductor
• possessing a massiveness of min. 10 mm to ensure full flux closure
• with an polished touching surface
• under conditions of no distance (surface-to-surface)
• under vertical application of breakaway force (90-degree angle)
• in stable room temperature

Magnet lifting force in use – key factors

In practice, the real power results from a number of factors, listed from the most important:

• Distance (betwixt the magnet and the metal), as even a very small clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to paint, rust or debris).
• Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
• Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
• Steel grade – ideal substrate is high-permeability steel. Stainless steels may attract less.
• Plate texture – ground elements ensure maximum contact, which increases field saturation. Uneven metal reduce efficiency.
• Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity was assessed by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.