XT-4 magnetyzery CO i WODY użytkowej - XT-4 magnetizer

Pros and cons of rare earth magnets.

Apart from their strong magnetic energy, neodymium magnets have these key benefits:

• They do not lose magnetism, even over around 10 years – the reduction in lifting capacity is only ~1% (theoretically),
• Magnets very well defend themselves against demagnetization caused by external fields,
• In other words, due to the reflective finish of gold, the element looks attractive,
• They show high magnetic induction at the operating surface, which affects their effectiveness,
• Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
• Possibility of detailed forming as well as modifying to individual requirements,
• Key role in high-tech industry – they are used in data components, brushless drives, diagnostic systems, and complex engineering applications.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Problematic aspects of neodymium magnets and ways of using them

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• Due to limitations in creating threads and complicated shapes in magnets, we recommend using a housing - magnetic holder.
• Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these devices can disrupt the diagnostic process 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

Magnetic strength at its maximum – what contributes to it?

Magnet power was defined for the most favorable conditions, taking into account:

• on a block made of structural steel, effectively closing the magnetic flux
• with a cross-section minimum 10 mm
• with a plane free of scratches
• under conditions of ideal adhesion (metal-to-metal)
• under vertical force vector (90-degree angle)
• in neutral thermal conditions

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity is influenced by working environment parameters, including (from most important):

• Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
• Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
• Chemical composition of the base – mild steel gives the best results. Higher carbon content decrease magnetic properties and lifting capacity.
• Surface finish – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
• Thermal factor – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance {between} the magnet and the plate reduces the load capacity.