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 do not lose strength, even after around ten years – the decrease in lifting capacity is only ~1% (based on measurements),
• Neodymium magnets are distinguished by remarkably resistant to demagnetization caused by external field sources,
• A magnet with a metallic gold surface has better aesthetics,
• Magnets possess impressive magnetic induction on the active area,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures reaching 230°C and above...
• Due to the potential of precise forming and adaptation to custom projects, NdFeB magnets can be produced in a wide range of forms and dimensions, which makes them more universal,
• Universal use in modern technologies – they are used in magnetic memories, drive modules, medical equipment, and industrial machines.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons of neodymium magnets: weaknesses and usage proposals

• They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
• When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
• We suggest casing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex forms.
• Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small elements of these magnets can be problematic in diagnostics 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 it depends on?

Breakaway force was determined for the most favorable conditions, taking into account:

• with the contact of a yoke made of special test steel, ensuring full magnetic saturation
• possessing a massiveness of minimum 10 mm to avoid saturation
• characterized by smoothness
• without any air gap between the magnet and steel
• during detachment in a direction vertical to the plane
• at standard ambient temperature

Impact of factors on magnetic holding capacity in practice

In practice, the actual lifting capacity depends on several key aspects, ranked from the most important:

• Clearance – the presence of any layer (rust, dirt, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of nominal force).
• Steel thickness – too thin plate does not close the flux, causing part of the flux to be escaped into the air.
• Steel type – low-carbon steel gives the best results. Alloy steels lower magnetic properties and lifting capacity.
• Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
• Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the holding force is lower. Additionally, even a small distance {between} the magnet and the plate lowers the holding force.