NC NeoCube fi 5 mm kuleczki kolorowe / N38 - neocube

Pros and cons of neodymium magnets.

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

• They retain full power for nearly 10 years – the drop is just ~1% (according to analyses),
• Magnets effectively protect themselves against demagnetization caused by external fields,
• By using a lustrous coating of gold, the element presents an proper look,
• Neodymium magnets achieve maximum magnetic induction on a contact point, which allows for strong attraction,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures approaching 230°C and above...
• Possibility of exact modeling and adapting to defined requirements,
• Key role in advanced technology sectors – they find application in hard drives, drive modules, medical devices, as well as multitasking production systems.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages of neodymium magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their 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.
• They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• We suggest a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated shapes.
• Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. Furthermore, tiny parts of these devices can disrupt the diagnostic process medical when they are in the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

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

The force parameter is a measurement result conducted under specific, ideal conditions:

• with the contact of a sheet made of low-carbon steel, ensuring maximum field concentration
• possessing a massiveness of minimum 10 mm to avoid saturation
• with a surface perfectly flat
• under conditions of ideal adhesion (metal-to-metal)
• during pulling in a direction perpendicular to the plane
• at conditions approx. 20°C

Determinants of practical lifting force of a magnet

In practice, the actual lifting capacity is determined by a number of factors, ranked from the most important:

• Clearance – existence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
• Angle of force application – maximum parameter is available only during perpendicular pulling. The resistance to sliding of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
• Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
• Plate material – mild steel attracts best. Alloy steels decrease magnetic properties and lifting capacity.
• Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
• Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a slight gap {between} the magnet and the plate lowers the lifting capacity.