NC NeoCube fi 5 mm kuleczki kolorowe / N38 - neocube

Pros and cons of NdFeB magnets.

Besides their exceptional field intensity, neodymium magnets offer the following advantages:

• They have unchanged lifting capacity, and over nearly 10 years their attraction force decreases symbolically – ~1% (in testing),
• Neodymium magnets remain highly resistant to magnetic field loss caused by magnetic disturbances,
• By applying a lustrous layer of nickel, the element acquires an elegant look,
• Magnets are characterized by extremely high magnetic induction on the active area,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
• Thanks to modularity in forming and the ability to customize to unusual requirements,
• Fundamental importance in future technologies – they are utilized in data components, electric motors, medical devices, and industrial machines.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also raises their durability
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
• We suggest cover - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex shapes.
• Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these products are able to complicate diagnosis medical when they are in the body.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Breakaway strength of the magnet in ideal conditions – what it depends on?

The lifting capacity listed is a measurement result executed under specific, ideal conditions:

• with the use of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
• whose thickness reaches at least 10 mm
• with an ground contact surface
• with direct contact (no paint)
• under vertical force direction (90-degree angle)
• at standard ambient temperature

What influences lifting capacity in practice

Real force is influenced by working environment parameters, such as (from priority):

• Clearance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
• Load vector – highest force is obtained only during perpendicular pulling. The shear force of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
• Steel grade – ideal substrate is high-permeability steel. Stainless steels may have worse magnetic properties.
• Surface structure – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
• Thermal factor – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.

* Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance {between} the magnet and the plate decreases the lifting capacity.