UMP 97x40 [M8+M10] GW F300 kg / N38 - search holder

Strengths as well as weaknesses of rare earth magnets.

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

• They retain magnetic properties for almost 10 years – the loss is just ~1% (in theory),
• Neodymium magnets are distinguished by exceptionally resistant to loss of magnetic properties caused by magnetic disturbances,
• The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
• The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
• Considering the option of free shaping and customization to specialized requirements, NdFeB magnets can be produced in a variety of forms and dimensions, which amplifies use scope,
• Huge importance in innovative solutions – they are utilized in data components, drive modules, diagnostic systems, and industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in small systems

Disadvantages of neodymium magnets:

• At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• Magnets exposed to a humid environment can corrode. Therefore during 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 threads inside the magnet and complicated shapes.
• Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small elements of these magnets are able to 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

Maximum holding power of the magnet – what contributes to it?

The lifting capacity listed is a measurement result conducted under the following configuration:

• on a base made of structural steel, perfectly concentrating the magnetic field
• whose thickness is min. 10 mm
• with a surface cleaned and smooth
• under conditions of no distance (surface-to-surface)
• under perpendicular force direction (90-degree angle)
• at conditions approx. 20°C

Determinants of practical lifting force of a magnet

Bear in mind that the working load will differ depending on the following factors, in order of importance:

• Air gap (between the magnet and the plate), since even a tiny distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
• Material composition – not every steel reacts the same. High carbon content worsen the interaction with the magnet.
• Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal reduce efficiency.
• Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was measured using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the holding force is lower. In addition, even a small distance {between} the magnet and the plate decreases the holding force.