RM R8 ULTRA - 13000 Gs / N52 - magnetic distributor

Advantages as well as disadvantages of NdFeB magnets.

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

• Their strength is durable, and after around ten years it decreases only by ~1% (according to research),
• They show high resistance to demagnetization induced by presence of other magnetic fields,
• The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
• Magnets possess exceptionally strong magnetic induction on the surface,
• With the right combination of magnetic alloys, they reach excellent thermal stability, enabling operation at or above 230°C (depending on the structure),
• Thanks to freedom in constructing and the ability to adapt to complex applications,
• Significant place in modern industrial fields – they find application in HDD drives, electric drive systems, precision medical tools, also technologically advanced constructions.
• Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Drawbacks and weaknesses of neodymium magnets: tips and applications.

• To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
• Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in realizing threads and complex forms in magnets, we recommend using casing - magnetic holder.
• Possible danger to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Additionally, small components of these magnets can complicate diagnosis medical after entering the body.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Optimal lifting capacity of a neodymium magnet – what affects it?

Information about lifting capacity is the result of a measurement for the most favorable conditions, taking into account:

• using a sheet made of high-permeability steel, serving as a ideal flux conductor
• with a cross-section minimum 10 mm
• with a surface cleaned and smooth
• with total lack of distance (without impurities)
• under vertical application of breakaway force (90-degree angle)
• in neutral thermal conditions

Lifting capacity in real conditions – factors

In practice, the actual lifting capacity depends on several key aspects, presented from most significant:

• Distance – the presence of foreign body (paint, dirt, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of maximum force).
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
• Metal type – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
• Surface finish – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
• Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap {between} the magnet and the plate decreases the holding force.