UMP 75x25 [M10x3] GW F200 GOLD Lina / N42 - search holder

Advantages and disadvantages of NdFeB magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
• They maintain their magnetic properties even under strong external field,
• In other words, due to the reflective surface of silver, the element gains visual value,
• Magnetic induction on the working layer of the magnet is very high,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
• Considering the option of precise shaping and adaptation to custom solutions, NdFeB magnets can be produced in a wide range of shapes and sizes, which makes them more universal,
• Wide application in advanced technology sectors – they find application in HDD drives, brushless drives, diagnostic systems, also modern systems.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in small systems

Drawbacks and weaknesses of neodymium magnets: application proposals

• At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• When exposed to high temperature, neodymium magnets experience 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 while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
• We suggest a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated shapes.
• Health risk resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small components of these products can complicate diagnosis medical in case of swallowing.
• With budget limitations the cost of neodymium magnets is a challenge,

Optimal lifting capacity of a neodymium magnet – what it depends on?

Information about lifting capacity was defined for ideal contact conditions, taking into account:

• using a sheet made of high-permeability steel, acting as a magnetic yoke
• possessing a thickness of at least 10 mm to ensure full flux closure
• characterized by lack of roughness
• with total lack of distance (no paint)
• during pulling in a direction vertical to the plane
• at room temperature

Practical lifting capacity: influencing factors

During everyday use, the real power depends on a number of factors, presented from the most important:

• Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
• Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
• Steel thickness – too thin plate does not close the flux, causing part of the power to be lost to the other side.
• Metal type – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
• Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
• Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

* Lifting capacity was assessed by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, whereas under shearing force the load capacity is reduced by as much as 5 times. In addition, even a slight gap {between} the magnet’s surface and the plate reduces the lifting capacity.